Geochronology and Geochemistry of the Intermediate-basic Dikes in the Beishan Area, Inner Mongolia: Implications for Tectonic Evolution of the Northern Margin of the Tarim Plate

doi:10.19657/j.geoscience.1000-8527.2022.089

Abstract

Abstract:

The formation age and genesis of the altered intermediate bedrock dike in the Laodonggou gold depo-sit (Ejin Banner, northern margin of Tarim terrane) provide a window to study the gold mineralization constraints and the Paleo-Asian Ocean evolution. In this study, a series of gold ore-related diabase dike and altered diorite porphyrite dike samples were collected from the Laodonggou ore section II, on which we conducted LA-ICP-MS zircon U-Pb dating, Hf isotope and whole-rock geochemical analyses. The results showed that the emplacement of diabase dikes and diorite porphyrite dikes occurred in the Early Permian (286.5±1.7 Ma) and Middle Triassic (243.2±1.1 Ma), respectively, and such age sequence is consistent with the observed field crosscutting relationship. According to the characteristics of diorite porphyrite dikes interlaced with gold orebo-dies, the gold mineralization is suggested to be slightly after 243 Ma. Zircon ε_Hf(t) value of the diabase dikes ranges from -3.67 to 0.97, and the whole-rock element composition shows that the rocks are peraluminous calc-alkaline. This indicates that the magma source region contains both Neoproterozoic juvenile crustal components and Mesoproterozoic ancient crustal components. Altered diorite porphyrite dike ε_Hf(t)=-0.07 to -4.76, and the whole-rock element composition is the peraluminous K-rich basalt series (K-rich characteristics affected by the potassic alteration in the mining area), indicating that the magma is mainly derived from the Mesoproterozoic crustal melting. Based on the Late Paleozoic to Early Mesozoic tectonic evolution in the northern margin of the Tarim block, we proposed that the Late Carboniferous-Early Permian paleo-oceanic basin subduction in the Beishan region may have led to partial melting of the mantle wedge, and that the magma may have ascended into shallow faults and cooled to form diabase dikes. In the end Early Permian, the Beishan region entered an intracontinental tectonic stage, and post-orogenic extension occurred in the Middle Triassic. This likely resulted in the decompression and melting of Mesoproterozoic crustal materials, and magma emplacement along crustal faults to form diorite porphyrite dikes.

Key words: U-Pb age, Lu-Hf isotope, lithogeochemistry, zircon, altered diorite porphyrite, diabase, Lao-donggou gold deposit, Ejina

CLC Number:

XUE Zhongkai, FAN Baocheng, HUANG Haoqing, TANG Weidong, GE Zhanlin, LI Pengwei, HU Jianhui, YANG Xiaoqi, GUO Yongchao, LI Kong. Geochronology and Geochemistry of the Intermediate-basic Dikes in the Beishan Area, Inner Mongolia: Implications for Tectonic Evolution of the Northern Margin of the Tarim Plate[J]. Geoscience, 2023, 37(03): 627-644.

Figures/Tables 16

Fig.1 Schematic diagram of the tectonic location of the Beishan orogenic belt (a),structural unit division map of Beishan area (b), and district geological map of Beishan area (c) (modified from ref.[6])

Fig.2 Geological map of the Laodonggou gold deposit (modified from ref.[7])

Fig.3 Underground gold orebody and ore photos from the Laodonggou ore section II

Fig.4 Altered diorite porphyrite and diabase hand-specimens and thin-section (XPL) photos from the Laodonggou ore section Ⅱ

Fig.5 Zircon CL image of altered diorite porphyrite and diabase from the Laodonggou ore section Ⅱ

Fig.6 Zircon U-Pb concordia diagram of diabase and altered diorite porphyrite from the Laodonggou ore section Ⅱ

Table 1 Zircon U-Th-Pb analysis data of altered diorite porphyrite and diabase from the Laodonggou ore section II

测点号	元素含量(10^-6)			Th/U	同位素比值								年龄(Ma)								谐和度 (%)
测点号	Pb	²³²Th	²³⁸U	Th/U	$? 207 P b ? 206 P b$	1σ	$? 207 P b ? 235 U$	1σ	$? 206 P b ? 238 U$	1σ	$? 208 P b ? 232 T h$	1σ	$? 207 P b ? 206 P b$	1σ	$? 207 P b ? 235 U$	1σ	$? 206 P b ? 238 U$	1σ	$? 208 P b ? 232 T h$	1σ	谐和度 (%)
LDGS001	38.23	174.60	251.51	0.69	0.04955	0.00236	0.26005	0.01206	0.03811	0.00050	0.01265	0.00027	174	108	235	10	241	3	254.0	5.49	0.97
LDGS002	44.42	206.98	292.95	0.71	0.05038	0.00210	0.26378	0.01068	0.03802	0.00046	0.01245	0.00024	212	94	238	9	241	3	250.2	4.88	0.99
LDGS003	42.61	229.85	273.03	0.84	0.04915	0.00275	0.26482	0.01443	0.03912	0.00056	0.01366	0.00031	155	126	239	12	247	4	274.2	6.14	0.96
LDGS004	42.35	192.73	276.74	0.70	0.05801	0.00239	0.30644	0.01221	0.03836	0.00048	0.01204	0.00025	530	88	271	9	243	3	241.9	5.08	0.89
LDGS005	51.51	243.02	337.78	0.72	0.05625	0.00226	0.29608	0.0115	0.03822	0.00047	0.01276	0.00025	462	87	263	9	242	3	256.3	5.00	0.92
LDGS006	37.15	161.24	241.52	0.67	0.05349	0.00259	0.28394	0.01334	0.03855	0.00052	0.01320	0.00030	350	106	254	11	244	3	265.1	6.05	0.96
LDGS007	43.36	219.22	281.59	0.78	0.05109	0.00234	0.27149	0.01207	0.03859	0.00050	0.01248	0.00026	245	102	244	10	244	3	250.7	5.22	1.00
LDGS008	45.22	223.65	292.39	0.76	0.04837	0.00220	0.25816	0.01140	0.03876	0.00049	0.01276	0.00025	117	104	233	9	245	3	256.3	5.07	0.95
LDGS009	55.26	302.00	359.58	0.84	0.05291	0.00214	0.28056	0.01098	0.03851	0.00047	0.01233	0.00022	325	89	251	9	244	3	247.8	4.45	0.97
LDGS010	28.38	106.87	186.34	0.57	0.06281	0.00327	0.32999	0.01665	0.03816	0.00057	0.01285	0.00036	702	107	290	13	241	4	258.1	7.26	0.83
LDGS011	43.77	176.79	283.96	0.62	0.0528	0.00245	0.28073	0.01266	0.03861	0.00051	0.01252	0.00030	320	102	251	10	244	3	251.5	5.90	0.97
LDGS012	45.38	246.29	295.69	0.83	0.05094	0.00254	0.26963	0.01309	0.03844	0.00052	0.01271	0.00027	238	111	242	10	243	3	255.4	5.38	1.00
LDGS013	35.53	142.05	228.29	0.62	0.05151	0.00349	0.27650	0.01827	0.03898	0.00066	0.01312	0.00043	264	149	248	15	247	4	263.5	8.56	0.99
LDGS014	35.16	155.68	231.19	0.67	0.05307	0.00296	0.27830	0.01514	0.03808	0.00055	0.01223	0.00032	332	122	249	12	241	3	245.7	6.34	0.97
LDGS015	30.70	134.52	197.04	0.68	0.05269	0.00319	0.28308	0.01668	0.03902	0.00061	0.01307	0.00037	315	132	253	13	247	4	262.4	7.34	0.98
LDGS016	49.64	223.58	326.05	0.69	0.04975	0.00247	0.26112	0.01262	0.03812	0.00051	0.01108	0.00028	183	112	236	10	241	3	222.7	5.62	0.98
LDGS017	31.83	128.04	205.98	0.62	0.05460	0.00323	0.29084	0.01678	0.03869	0.00059	0.01227	0.00040	396	127	259	13	245	4	246.5	7.91	0.94
LDGS018	27.97	125.15	182.41	0.69	0.05349	0.00332	0.28271	0.01708	0.03839	0.00061	0.01186	0.00036	350	134	253	14	243	4	238.3	7.15	0.96
LDGS019	29.97	135.22	192.26	0.70	0.04943	0.00342	0.26556	0.01795	0.03902	0.00066	0.01182	0.00038	168	154	239	14	247	4	237.6	7.52	0.97
LDGS020	39.72	198.92	259.46	0.77	0.06439	0.00307	0.33976	0.01565	0.03833	0.00054	0.01486	0.00032	754	97	297	12	243	3	298.1	6.33	0.82
LDGS021	42.99	184.13	277.35	0.66	0.05334	0.00237	0.28498	0.01231	0.03880	0.00050	0.01244	0.00027	343	97	255	10	245	3	249.9	5.44	0.96
LDGS022	39.38	184.12	258.07	0.71	0.05346	0.00225	0.28118	0.01148	0.03820	0.00047	0.01149	0.00024	348	92	252	9	242	3	230.9	4.85	0.96
LDGS023	38.39	160.69	250.41	0.64	0.05254	0.00241	0.27763	0.01240	0.03838	0.00049	0.01186	0.00027	309	101	249	10	243	3	238.3	5.39	0.98
LDGS024	39.17	177.15	254.57	0.70	0.05145	0.00247	0.27280	0.01273	0.03851	0.00051	0.01185	0.00027	261	106	245	10	244	3	238.1	5.47	0.99
LDGS025	36.62	170.96	237.09	0.72	0.05027	0.00250	0.26757	0.01297	0.03866	0.00052	0.01203	0.00027	208	112	241	10	245	3	241.7	5.49	0.98
LDGS026	40.06	188.6	262.44	0.72	0.05046	0.00211	0.26543	0.01076	0.03820	0.00047	0.01229	0.00024	216	94	239	9	242	3	246.8	4.70	0.99
LDGS027	53.52	266.51	351.33	0.76	0.05314	0.00208	0.27890	0.01058	0.03812	0.00046	0.01258	0.00023	335	86	250	8	241	3	252.7	4.53	0.97
LDGS028	44.58	230.34	285.80	0.81	0.05159	0.00228	0.27727	0.01192	0.03903	0.00049	0.01289	0.00025	267	98	249	9	247	3	258.9	4.94	0.99
LDGS029	35.83	162.42	232.44	0.70	0.05438	0.00250	0.28881	0.01290	0.03857	0.00051	0.01236	0.00027	387	100	258	10	244	3	248.2	5.40	0.95
LDGS030	47.68	230.12	314.06	0.73	0.05334	0.00215	0.27899	0.01089	0.03799	0.00046	0.01156	0.00022	343	88	250	9	240	3	232.4	4.49	0.96
LDGH001	34.39	100.79	182.94	0.55	0.05261	0.00139	0.33126	0.00832	0.04566	0.00053	0.01412	0.00081	312	59	291	6	288	3	283.3	16.11	0.99
LDGH002	14.32	48.95	75.54	0.65	0.05169	0.00172	0.32818	0.01047	0.04604	0.0006	0.01393	0.00093	272	75	288	8	290	4	279.6	18.64	1.01
LDGH003	24.73	83.48	129.96	0.64	0.05353	0.00146	0.34112	0.00883	0.04621	0.00055	0.01382	0.00078	351	60	298	7	291	3	277.4	15.5	0.98
LDGH004	26.91	98.67	141.42	0.70	0.05097	0.00152	0.32454	0.00925	0.04617	0.00058	0.01441	0.00085	240	68	285	7	291	4	289.3	16.97	1.02
LDGH005	13.92	55.17	74.41	0.74	0.05130	0.00176	0.32105	0.01057	0.04538	0.00059	0.01249	0.00082	254	77	283	8	286	4	250.9	16.41	1.01
LDGH006	28.32	113.05	152.35	0.74	0.05125	0.00121	0.31860	0.00716	0.04508	0.00050	0.01518	0.00062	252	54	281	6	284	3	304.5	12.41	1.01
LDGH007	21.95	89.45	116.93	0.76	0.05036	0.00144	0.31606	0.00864	0.04551	0.00055	0.01424	0.00074	212	65	279	7	287	3	285.8	14.83	1.03
LDGH008	41.35	107.61	222.63	0.48	0.0512	0.00105	0.31790	0.00615	0.04502	0.00047	0.01315	0.00061	250	46	280	5	284	3	264.1	12.19	1.01
LDGH009	68.68	165.01	369.06	0.45	0.05135	0.00094	0.31908	0.00548	0.04506	0.00045	0.01312	0.00052	257	41	281	4	284	3	263.4	10.38	1.01
LDGH010	17.57	73.44	94.37	0.78	0.05197	0.00171	0.32302	0.01018	0.04507	0.00058	0.01313	0.00084	284	73	284	8	284	4	263.6	16.71	1.00
LDGH011	14.67	69.33	78.20	0.89	0.04828	0.00201	0.30216	0.01213	0.04538	0.00063	0.01205	0.00084	113	95	268	9	286	4	242.1	16.76	1.07
LDGH012	16.92	38.94	88.63	0.44	0.0503	0.00232	0.32033	0.01418	0.04618	0.00075	0.01559	0.00175	209	104	282	11	291	5	312.7	34.84	1.03
LDGH013	32.01	118.49	172.17	0.69	0.05285	0.00122	0.32763	0.00719	0.04495	0.00050	0.01433	0.00064	322	52	288	6	284	3	287.6	12.84	0.99
LDGH014	14.35	59.65	77.16	0.77	0.05305	0.00235	0.32884	0.01402	0.04495	0.00069	0.01368	0.00114	331	97	289	11	284	4	274.5	22.75	0.98
LDGH015	11.17	42.24	60.02	0.70	0.05229	0.00238	0.32422	0.0142	0.04496	0.00071	0.01482	0.00123	298	101	285	11	284	4	297.3	24.47	0.99
LDGH016	20.00	63.72	104.64	0.61	0.05439	0.00192	0.34633	0.0117	0.04618	0.00064	0.01416	0.00113	387	77	302	9	291	4	284.1	22.44	0.96
LDGH017	15.13	47.16	80.29	0.59	0.05112	0.00205	0.32088	0.01236	0.04551	0.00065	0.01653	0.00131	246	90	283	10	287	4	331.3	25.98	1.02

Table 1 Zircon U-Th-Pb analysis data of altered diorite porphyrite and diabase from the Laodonggou ore section II

测点号	元素含量(10^-6)			Th/U	同位素比值								年龄(Ma)								谐和度 (%)
测点号	Pb	²³²Th	²³⁸U	Th/U	$? 207 P b ? 206 P b$	1σ	$? 207 P b ? 235 U$	1σ	$? 206 P b ? 238 U$	1σ	$? 208 P b ? 232 T h$	1σ	$? 207 P b ? 206 P b$	1σ	$? 207 P b ? 235 U$	1σ	$? 206 P b ? 238 U$	1σ	$? 208 P b ? 232 T h$	1σ	谐和度 (%)
LDGS001	38.23	174.60	251.51	0.69	0.04955	0.00236	0.26005	0.01206	0.03811	0.00050	0.01265	0.00027	174	108	235	10	241	3	254.0	5.49	0.97
LDGS002	44.42	206.98	292.95	0.71	0.05038	0.00210	0.26378	0.01068	0.03802	0.00046	0.01245	0.00024	212	94	238	9	241	3	250.2	4.88	0.99
LDGS003	42.61	229.85	273.03	0.84	0.04915	0.00275	0.26482	0.01443	0.03912	0.00056	0.01366	0.00031	155	126	239	12	247	4	274.2	6.14	0.96
LDGS004	42.35	192.73	276.74	0.70	0.05801	0.00239	0.30644	0.01221	0.03836	0.00048	0.01204	0.00025	530	88	271	9	243	3	241.9	5.08	0.89
LDGS005	51.51	243.02	337.78	0.72	0.05625	0.00226	0.29608	0.0115	0.03822	0.00047	0.01276	0.00025	462	87	263	9	242	3	256.3	5.00	0.92
LDGS006	37.15	161.24	241.52	0.67	0.05349	0.00259	0.28394	0.01334	0.03855	0.00052	0.01320	0.00030	350	106	254	11	244	3	265.1	6.05	0.96
LDGS007	43.36	219.22	281.59	0.78	0.05109	0.00234	0.27149	0.01207	0.03859	0.00050	0.01248	0.00026	245	102	244	10	244	3	250.7	5.22	1.00
LDGS008	45.22	223.65	292.39	0.76	0.04837	0.00220	0.25816	0.01140	0.03876	0.00049	0.01276	0.00025	117	104	233	9	245	3	256.3	5.07	0.95
LDGS009	55.26	302.00	359.58	0.84	0.05291	0.00214	0.28056	0.01098	0.03851	0.00047	0.01233	0.00022	325	89	251	9	244	3	247.8	4.45	0.97
LDGS010	28.38	106.87	186.34	0.57	0.06281	0.00327	0.32999	0.01665	0.03816	0.00057	0.01285	0.00036	702	107	290	13	241	4	258.1	7.26	0.83
LDGS011	43.77	176.79	283.96	0.62	0.0528	0.00245	0.28073	0.01266	0.03861	0.00051	0.01252	0.00030	320	102	251	10	244	3	251.5	5.90	0.97
LDGS012	45.38	246.29	295.69	0.83	0.05094	0.00254	0.26963	0.01309	0.03844	0.00052	0.01271	0.00027	238	111	242	10	243	3	255.4	5.38	1.00
LDGS013	35.53	142.05	228.29	0.62	0.05151	0.00349	0.27650	0.01827	0.03898	0.00066	0.01312	0.00043	264	149	248	15	247	4	263.5	8.56	0.99
LDGS014	35.16	155.68	231.19	0.67	0.05307	0.00296	0.27830	0.01514	0.03808	0.00055	0.01223	0.00032	332	122	249	12	241	3	245.7	6.34	0.97
LDGS015	30.70	134.52	197.04	0.68	0.05269	0.00319	0.28308	0.01668	0.03902	0.00061	0.01307	0.00037	315	132	253	13	247	4	262.4	7.34	0.98
LDGS016	49.64	223.58	326.05	0.69	0.04975	0.00247	0.26112	0.01262	0.03812	0.00051	0.01108	0.00028	183	112	236	10	241	3	222.7	5.62	0.98
LDGS017	31.83	128.04	205.98	0.62	0.05460	0.00323	0.29084	0.01678	0.03869	0.00059	0.01227	0.00040	396	127	259	13	245	4	246.5	7.91	0.94
LDGS018	27.97	125.15	182.41	0.69	0.05349	0.00332	0.28271	0.01708	0.03839	0.00061	0.01186	0.00036	350	134	253	14	243	4	238.3	7.15	0.96
LDGS019	29.97	135.22	192.26	0.70	0.04943	0.00342	0.26556	0.01795	0.03902	0.00066	0.01182	0.00038	168	154	239	14	247	4	237.6	7.52	0.97
LDGS020	39.72	198.92	259.46	0.77	0.06439	0.00307	0.33976	0.01565	0.03833	0.00054	0.01486	0.00032	754	97	297	12	243	3	298.1	6.33	0.82
LDGS021	42.99	184.13	277.35	0.66	0.05334	0.00237	0.28498	0.01231	0.03880	0.00050	0.01244	0.00027	343	97	255	10	245	3	249.9	5.44	0.96
LDGS022	39.38	184.12	258.07	0.71	0.05346	0.00225	0.28118	0.01148	0.03820	0.00047	0.01149	0.00024	348	92	252	9	242	3	230.9	4.85	0.96
LDGS023	38.39	160.69	250.41	0.64	0.05254	0.00241	0.27763	0.01240	0.03838	0.00049	0.01186	0.00027	309	101	249	10	243	3	238.3	5.39	0.98
LDGS024	39.17	177.15	254.57	0.70	0.05145	0.00247	0.27280	0.01273	0.03851	0.00051	0.01185	0.00027	261	106	245	10	244	3	238.1	5.47	0.99
LDGS025	36.62	170.96	237.09	0.72	0.05027	0.00250	0.26757	0.01297	0.03866	0.00052	0.01203	0.00027	208	112	241	10	245	3	241.7	5.49	0.98
LDGS026	40.06	188.6	262.44	0.72	0.05046	0.00211	0.26543	0.01076	0.03820	0.00047	0.01229	0.00024	216	94	239	9	242	3	246.8	4.70	0.99
LDGS027	53.52	266.51	351.33	0.76	0.05314	0.00208	0.27890	0.01058	0.03812	0.00046	0.01258	0.00023	335	86	250	8	241	3	252.7	4.53	0.97
LDGS028	44.58	230.34	285.80	0.81	0.05159	0.00228	0.27727	0.01192	0.03903	0.00049	0.01289	0.00025	267	98	249	9	247	3	258.9	4.94	0.99
LDGS029	35.83	162.42	232.44	0.70	0.05438	0.00250	0.28881	0.01290	0.03857	0.00051	0.01236	0.00027	387	100	258	10	244	3	248.2	5.40	0.95
LDGS030	47.68	230.12	314.06	0.73	0.05334	0.00215	0.27899	0.01089	0.03799	0.00046	0.01156	0.00022	343	88	250	9	240	3	232.4	4.49	0.96
LDGH001	34.39	100.79	182.94	0.55	0.05261	0.00139	0.33126	0.00832	0.04566	0.00053	0.01412	0.00081	312	59	291	6	288	3	283.3	16.11	0.99
LDGH002	14.32	48.95	75.54	0.65	0.05169	0.00172	0.32818	0.01047	0.04604	0.0006	0.01393	0.00093	272	75	288	8	290	4	279.6	18.64	1.01
LDGH003	24.73	83.48	129.96	0.64	0.05353	0.00146	0.34112	0.00883	0.04621	0.00055	0.01382	0.00078	351	60	298	7	291	3	277.4	15.5	0.98
LDGH004	26.91	98.67	141.42	0.70	0.05097	0.00152	0.32454	0.00925	0.04617	0.00058	0.01441	0.00085	240	68	285	7	291	4	289.3	16.97	1.02
LDGH005	13.92	55.17	74.41	0.74	0.05130	0.00176	0.32105	0.01057	0.04538	0.00059	0.01249	0.00082	254	77	283	8	286	4	250.9	16.41	1.01
LDGH006	28.32	113.05	152.35	0.74	0.05125	0.00121	0.31860	0.00716	0.04508	0.00050	0.01518	0.00062	252	54	281	6	284	3	304.5	12.41	1.01
LDGH007	21.95	89.45	116.93	0.76	0.05036	0.00144	0.31606	0.00864	0.04551	0.00055	0.01424	0.00074	212	65	279	7	287	3	285.8	14.83	1.03
LDGH008	41.35	107.61	222.63	0.48	0.0512	0.00105	0.31790	0.00615	0.04502	0.00047	0.01315	0.00061	250	46	280	5	284	3	264.1	12.19	1.01
LDGH009	68.68	165.01	369.06	0.45	0.05135	0.00094	0.31908	0.00548	0.04506	0.00045	0.01312	0.00052	257	41	281	4	284	3	263.4	10.38	1.01
LDGH010	17.57	73.44	94.37	0.78	0.05197	0.00171	0.32302	0.01018	0.04507	0.00058	0.01313	0.00084	284	73	284	8	284	4	263.6	16.71	1.00
LDGH011	14.67	69.33	78.20	0.89	0.04828	0.00201	0.30216	0.01213	0.04538	0.00063	0.01205	0.00084	113	95	268	9	286	4	242.1	16.76	1.07
LDGH012	16.92	38.94	88.63	0.44	0.0503	0.00232	0.32033	0.01418	0.04618	0.00075	0.01559	0.00175	209	104	282	11	291	5	312.7	34.84	1.03
LDGH013	32.01	118.49	172.17	0.69	0.05285	0.00122	0.32763	0.00719	0.04495	0.00050	0.01433	0.00064	322	52	288	6	284	3	287.6	12.84	0.99
LDGH014	14.35	59.65	77.16	0.77	0.05305	0.00235	0.32884	0.01402	0.04495	0.00069	0.01368	0.00114	331	97	289	11	284	4	274.5	22.75	0.98
LDGH015	11.17	42.24	60.02	0.70	0.05229	0.00238	0.32422	0.0142	0.04496	0.00071	0.01482	0.00123	298	101	285	11	284	4	297.3	24.47	0.99
LDGH016	20.00	63.72	104.64	0.61	0.05439	0.00192	0.34633	0.0117	0.04618	0.00064	0.01416	0.00113	387	77	302	9	291	4	284.1	22.44	0.96
LDGH017	15.13	47.16	80.29	0.59	0.05112	0.00205	0.32088	0.01236	0.04551	0.00065	0.01653	0.00131	246	90	283	10	287	4	331.3	25.98	1.02

Table 2 Zircon rare earth and trace element contents of altered diorite porphyrite and diabase from the Laodonggou ore section II(10-6)

测试点	Nb	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Ta	Nb/Ta
LDGS001	1.371	0.0058	38.27	0.0842	1.31	2.97	0.949	13.06	4.33	54.04	20.53	90.28	20.56	209.12	39.59	0.596	2.300
LDGS002	1.641	0.0140	36.93	0.0859	1.48	3.37	0.917	13.19	4.60	53.96	21.05	94.81	21.23	213.33	40.36	0.535	3.067
LDGS003	1.431	0.0270	38.02	0.1100	1.61	2.82	0.899	15.07	4.74	53.98	19.05	89.72	17.64	188.85	37.61	0.486	2.944
LDGS004	1.821	4.1800	49.77	1.1110	5.57	3.21	0.829	13.41	5.09	60.92	23.29	108.23	24.17	245.47	47.53	0.447	4.073
LDGS005	2.200	3.6200	48.85	1.0370	5.36	4.27	1.283	18.50	5.76	71.35	28.19	129.33	29.92	293.56	57.15	0.836	2.631
LDGS006	1.350	0.0084	35.13	0.0637	1.10	2.43	0.756	12.16	4.14	48.00	18.26	83.05	18.52	186.27	36.67	0.564	2.393
LDGS007	1.655	0.2380	39.37	0.1290	1.83	2.72	1.000	12.58	4.74	54.64	19.89	89.86	19.61	202.37	37.47	0.524	3.158
LDGS008	1.846	0.0366	40.94	0.0870	1.81	3.32	1.436	18.07	6.07	68.04	27.11	121.82	26.71	269.31	55.25	0.647	2.853
LDGS009	2.560	0.0260	52.67	0.2010	2.95	6.29	1.626	27.27	8.70	104.39	38.31	175.78	38.61	373.55	72.48	0.784	3.265
LDGS010	1.405	1.8420	29.03	0.5770	3.02	2.56	0.902	9.61	3.55	40.99	15.30	73.95	16.23	164.10	31.76	0.604	2.326
LDGS011	2.270	0.0165	37.65	0.1140	1.59	3.97	1.399	19.85	6.59	80.70	30.01	142.60	31.86	334.09	64.10	0.593	3.827
LDGS012	1.648	0.0251	43.71	0.0870	1.49	3.11	1.031	13.15	5.02	55.08	20.45	91.68	20.70	204.62	40.32	0.571	2.886
LDGS013	1.382	43.8100	129.27	11.0300	48.68	7.10	1.880	18.33	4.83	52.77	20.10	88.48	19.85	188.22	39.35	0.546	2.531
LDGS014	1.527	0.0340	32.56	0.0670	1.42	3.62	1.074	15.39	4.76	55.60	22.27	103.85	22.85	231.11	46.81	0.635	2.404
LDGS015	0.884	1.6640	33.88	0.4200	2.97	2.78	0.883	11.65	4.10	44.96	15.87	75.11	17.09	174.44	33.55	0.434	2.036
LDGS016	2.930	0.0106	43.00	0.1100	2.04	4.76	1.313	19.44	7.28	87.01	34.65	153.94	34.37	345.13	67.31	0.962	3.045
LDGS017	1.495	25.4700	91.13	6.9300	28.88	8.37	1.462	19.90	5.43	61.17	22.46	106.29	23.62	236.64	47.71	0.691	2.163
LDGS018	1.089	0.0265	29.07	0.0800	0.86	1.92	0.945	8.59	3.12	37.06	14.24	69.38	14.49	152.87	29.67	0.323	3.371
LDGS019	1.068	0.0288	28.17	0.0730	1.55	2.80	0.932	15.27	4.82	55.75	20.89	95.73	19.97	206.67	41.00	0.488	2.188
LDGS020	1.148	75.0600	186.85	18.6400	79.58	15.63	2.090	18.45	6.02	57.27	20.41	87.87	19.62	192.03	39.29	0.422	2.720
LDGS021	1.634	8.3500	53.83	2.1100	10.14	4.66	0.990	16.56	5.30	59.77	22.83	104.16	22.33	241.46	46.44	0.698	2.341
LDGS022	1.133	16.3800	72.44	4.3300	19.15	6.51	1.086	15.22	4.73	55.72	20.52	90.64	20.22	198.45	39.17	0.670	1.691
LDGS023	1.635	0.0217	36.22	0.0950	1.77	2.57	0.950	15.75	5.13	63.07	22.83	105.46	24.07	257.62	49.49	0.642	2.546
LDGS024	1.783	1.5510	41.82	0.4470	3.16	2.64	0.982	15.99	5.32	60.09	23.30	109.47	23.46	239.64	47.33	0.768	2.321
LDGS025	1.512	0.0060	36.64	0.0667	1.48	2.74	0.893	14.26	5.13	57.50	21.12	97.92	22.07	225.80	42.20	0.616	2.454
LDGS026	1.657	8.6100	57.59	2.1500	9.55	3.78	1.220	15.78	4.51	53.96	20.51	92.28	20.86	215.25	41.01	0.626	2.646
LDGS027	1.863	40.5600	127.80	10.0500	42.83	13.31	2.370	33.11	9.80	104.32	37.15	169.90	35.64	345.07	68.66	0.601	3.099
LDGS028	2.200	0.0413	42.70	0.1040	1.95	3.01	1.398	17.69	6.41	74.75	29.24	131.84	29.73	287.23	57.94	0.593	3.709
LDGS029	1.406	0.0071	34.03	0.0679	1.31	2.36	0.991	15.09	4.69	53.08	19.60	89.91	19.61	208.65	41.69	0.581	2.419
LDGS030	1.910	0.2540	41.2	0.1660	2.20	3.71	1.057	18.69	5.93	70.95	27.66	119.61	27.93	269.16	51.89	0.733	2.605
LDGH001	0.418	0.0340	5.20	0.0150	0.19	0.32	0.283	3.82	1.56	26.83	11.05	59.26	16.92	221.88	53.13	0.323	1.294
LDGH002	0.612	0.0520	6.87	0.0270	0.69	2.14	0.607	13.11	4.94	64.36	25.75	125.35	27.50	266.44	55.40	0.342	1.789
LDGH003	1.254	0.0044	9.80	0.0230	0.48	1.61	0.486	13.58	4.66	67.52	30.40	155.70	33.84	345.73	73.32	0.574	2.184
LDGH004	0.463	0.0090	7.01	0.0360	0.52	1.30	0.213	6.61	2.92	35.02	14.50	79.40	20.50	241.23	56.19	0.272	1.702
LDGH005	0.610	0.0400	7.80	0.0520	0.64	1.40	0.255	11.04	4.88	58.82	24.53	110.28	24.00	242.39	48.07	0.400	1.525
LDGH006	0.579	0.0140	8.29	0.0300	0.44	1.42	0.405	7.92	3.12	45.00	18.82	94.07	23.88	266.56	58.64	0.229	2.528
LDGH007	0.531	0.0041	8.90	0.0660	1.44	3.22	0.500	20.01	6.76	83.75	35.38	161.48	33.63	340.12	68.16	0.430	1.234
LDGH008	0.376	0.0103	4.99	0.0089	0.24	0.264	0.194	2.98	1.129	20.82	9.47	50.83	14.97	185.77	44.75	0.353	1.065
LDGH009	0.729	0.1910	9.42	0.1400	1.12	0.80	0.366	4.29	1.82	26.34	12.76	71.21	19.73	262.52	63.53	0.678	1.075
LDGH010	0.686	0.0022	8.86	0.0310	0.74	2.68	0.402	13.14	5.82	71.13	28.62	129.41	28.41	277.03	55.91	0.281	2.441
LDGH011	0.437	0.0072	7.99	0.0590	1.61	4.06	0.740	17.40	7.02	88.95	33.61	150.17	32.25	308.09	59.05	0.276	1.583
LDGH012	0.247	0.0480	4.05	0.0360	0.30	0.44	0.300	2.00	0.71	11.85	6.10	36.06	10.05	125.14	28.95	0.239	1.033
LDGH013	0.343	0.5660	9.21	0.4370	2.81	1.99	0.671	8.48	3.02	39.17	16.19	83.05	20.91	243.41	55.77	0.341	1.005
LDGH014	0.651	0.0090	7.55	0.0560	1.07	2.90	0.392	15.74	5.93	70.31	29.03	136.11	28.99	276.70	57.08	0.420	1.550
LDGH015	0.356	0.2410	7.24	0.0700	0.53	2.12	0.496	11.15	4.21	54.31	22.12	101.51	21.37	216.34	42.33	0.201	1.771
LDGH016	0.937	0.0032	8.57	0.0350	0.40	0.92	0.209	6.53	2.87	36.90	15.43	76.46	17.50	196.07	39.38	0.267	3.509
LDGH017	0.476	0.0540	6.54	0.0260	0.32	0.57	0.207	4.72	2.21	27.76	13.83	70.25	17.49	184.82	41.07	0.224	2.125

Table 2 Zircon rare earth and trace element contents of altered diorite porphyrite and diabase from the Laodonggou ore section II(10-6)

测试点	Nb	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Ta	Nb/Ta
LDGS001	1.371	0.0058	38.27	0.0842	1.31	2.97	0.949	13.06	4.33	54.04	20.53	90.28	20.56	209.12	39.59	0.596	2.300
LDGS002	1.641	0.0140	36.93	0.0859	1.48	3.37	0.917	13.19	4.60	53.96	21.05	94.81	21.23	213.33	40.36	0.535	3.067
LDGS003	1.431	0.0270	38.02	0.1100	1.61	2.82	0.899	15.07	4.74	53.98	19.05	89.72	17.64	188.85	37.61	0.486	2.944
LDGS004	1.821	4.1800	49.77	1.1110	5.57	3.21	0.829	13.41	5.09	60.92	23.29	108.23	24.17	245.47	47.53	0.447	4.073
LDGS005	2.200	3.6200	48.85	1.0370	5.36	4.27	1.283	18.50	5.76	71.35	28.19	129.33	29.92	293.56	57.15	0.836	2.631
LDGS006	1.350	0.0084	35.13	0.0637	1.10	2.43	0.756	12.16	4.14	48.00	18.26	83.05	18.52	186.27	36.67	0.564	2.393
LDGS007	1.655	0.2380	39.37	0.1290	1.83	2.72	1.000	12.58	4.74	54.64	19.89	89.86	19.61	202.37	37.47	0.524	3.158
LDGS008	1.846	0.0366	40.94	0.0870	1.81	3.32	1.436	18.07	6.07	68.04	27.11	121.82	26.71	269.31	55.25	0.647	2.853
LDGS009	2.560	0.0260	52.67	0.2010	2.95	6.29	1.626	27.27	8.70	104.39	38.31	175.78	38.61	373.55	72.48	0.784	3.265
LDGS010	1.405	1.8420	29.03	0.5770	3.02	2.56	0.902	9.61	3.55	40.99	15.30	73.95	16.23	164.10	31.76	0.604	2.326
LDGS011	2.270	0.0165	37.65	0.1140	1.59	3.97	1.399	19.85	6.59	80.70	30.01	142.60	31.86	334.09	64.10	0.593	3.827
LDGS012	1.648	0.0251	43.71	0.0870	1.49	3.11	1.031	13.15	5.02	55.08	20.45	91.68	20.70	204.62	40.32	0.571	2.886
LDGS013	1.382	43.8100	129.27	11.0300	48.68	7.10	1.880	18.33	4.83	52.77	20.10	88.48	19.85	188.22	39.35	0.546	2.531
LDGS014	1.527	0.0340	32.56	0.0670	1.42	3.62	1.074	15.39	4.76	55.60	22.27	103.85	22.85	231.11	46.81	0.635	2.404
LDGS015	0.884	1.6640	33.88	0.4200	2.97	2.78	0.883	11.65	4.10	44.96	15.87	75.11	17.09	174.44	33.55	0.434	2.036
LDGS016	2.930	0.0106	43.00	0.1100	2.04	4.76	1.313	19.44	7.28	87.01	34.65	153.94	34.37	345.13	67.31	0.962	3.045
LDGS017	1.495	25.4700	91.13	6.9300	28.88	8.37	1.462	19.90	5.43	61.17	22.46	106.29	23.62	236.64	47.71	0.691	2.163
LDGS018	1.089	0.0265	29.07	0.0800	0.86	1.92	0.945	8.59	3.12	37.06	14.24	69.38	14.49	152.87	29.67	0.323	3.371
LDGS019	1.068	0.0288	28.17	0.0730	1.55	2.80	0.932	15.27	4.82	55.75	20.89	95.73	19.97	206.67	41.00	0.488	2.188
LDGS020	1.148	75.0600	186.85	18.6400	79.58	15.63	2.090	18.45	6.02	57.27	20.41	87.87	19.62	192.03	39.29	0.422	2.720
LDGS021	1.634	8.3500	53.83	2.1100	10.14	4.66	0.990	16.56	5.30	59.77	22.83	104.16	22.33	241.46	46.44	0.698	2.341
LDGS022	1.133	16.3800	72.44	4.3300	19.15	6.51	1.086	15.22	4.73	55.72	20.52	90.64	20.22	198.45	39.17	0.670	1.691
LDGS023	1.635	0.0217	36.22	0.0950	1.77	2.57	0.950	15.75	5.13	63.07	22.83	105.46	24.07	257.62	49.49	0.642	2.546
LDGS024	1.783	1.5510	41.82	0.4470	3.16	2.64	0.982	15.99	5.32	60.09	23.30	109.47	23.46	239.64	47.33	0.768	2.321
LDGS025	1.512	0.0060	36.64	0.0667	1.48	2.74	0.893	14.26	5.13	57.50	21.12	97.92	22.07	225.80	42.20	0.616	2.454
LDGS026	1.657	8.6100	57.59	2.1500	9.55	3.78	1.220	15.78	4.51	53.96	20.51	92.28	20.86	215.25	41.01	0.626	2.646
LDGS027	1.863	40.5600	127.80	10.0500	42.83	13.31	2.370	33.11	9.80	104.32	37.15	169.90	35.64	345.07	68.66	0.601	3.099
LDGS028	2.200	0.0413	42.70	0.1040	1.95	3.01	1.398	17.69	6.41	74.75	29.24	131.84	29.73	287.23	57.94	0.593	3.709
LDGS029	1.406	0.0071	34.03	0.0679	1.31	2.36	0.991	15.09	4.69	53.08	19.60	89.91	19.61	208.65	41.69	0.581	2.419
LDGS030	1.910	0.2540	41.2	0.1660	2.20	3.71	1.057	18.69	5.93	70.95	27.66	119.61	27.93	269.16	51.89	0.733	2.605
LDGH001	0.418	0.0340	5.20	0.0150	0.19	0.32	0.283	3.82	1.56	26.83	11.05	59.26	16.92	221.88	53.13	0.323	1.294
LDGH002	0.612	0.0520	6.87	0.0270	0.69	2.14	0.607	13.11	4.94	64.36	25.75	125.35	27.50	266.44	55.40	0.342	1.789
LDGH003	1.254	0.0044	9.80	0.0230	0.48	1.61	0.486	13.58	4.66	67.52	30.40	155.70	33.84	345.73	73.32	0.574	2.184
LDGH004	0.463	0.0090	7.01	0.0360	0.52	1.30	0.213	6.61	2.92	35.02	14.50	79.40	20.50	241.23	56.19	0.272	1.702
LDGH005	0.610	0.0400	7.80	0.0520	0.64	1.40	0.255	11.04	4.88	58.82	24.53	110.28	24.00	242.39	48.07	0.400	1.525
LDGH006	0.579	0.0140	8.29	0.0300	0.44	1.42	0.405	7.92	3.12	45.00	18.82	94.07	23.88	266.56	58.64	0.229	2.528
LDGH007	0.531	0.0041	8.90	0.0660	1.44	3.22	0.500	20.01	6.76	83.75	35.38	161.48	33.63	340.12	68.16	0.430	1.234
LDGH008	0.376	0.0103	4.99	0.0089	0.24	0.264	0.194	2.98	1.129	20.82	9.47	50.83	14.97	185.77	44.75	0.353	1.065
LDGH009	0.729	0.1910	9.42	0.1400	1.12	0.80	0.366	4.29	1.82	26.34	12.76	71.21	19.73	262.52	63.53	0.678	1.075
LDGH010	0.686	0.0022	8.86	0.0310	0.74	2.68	0.402	13.14	5.82	71.13	28.62	129.41	28.41	277.03	55.91	0.281	2.441
LDGH011	0.437	0.0072	7.99	0.0590	1.61	4.06	0.740	17.40	7.02	88.95	33.61	150.17	32.25	308.09	59.05	0.276	1.583
LDGH012	0.247	0.0480	4.05	0.0360	0.30	0.44	0.300	2.00	0.71	11.85	6.10	36.06	10.05	125.14	28.95	0.239	1.033
LDGH013	0.343	0.5660	9.21	0.4370	2.81	1.99	0.671	8.48	3.02	39.17	16.19	83.05	20.91	243.41	55.77	0.341	1.005
LDGH014	0.651	0.0090	7.55	0.0560	1.07	2.90	0.392	15.74	5.93	70.31	29.03	136.11	28.99	276.70	57.08	0.420	1.550
LDGH015	0.356	0.2410	7.24	0.0700	0.53	2.12	0.496	11.15	4.21	54.31	22.12	101.51	21.37	216.34	42.33	0.201	1.771
LDGH016	0.937	0.0032	8.57	0.0350	0.40	0.92	0.209	6.53	2.87	36.90	15.43	76.46	17.50	196.07	39.38	0.267	3.509
LDGH017	0.476	0.0540	6.54	0.0260	0.32	0.57	0.207	4.72	2.21	27.76	13.83	70.25	17.49	184.82	41.07	0.224	2.125

Fig.7 REE distribution patterns of diabase and altered diorite porphyrite from the Laodonggou ore section II (after Sun et al[21])

Table 3 Zircon Lu-Hf isotope data of altered diorite porphyrite and diabase from the Laodonggou ore section Ⅱ

分析点号	²⁰⁶Pb/²³⁸U 年龄(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf±2σ	¹⁷⁶Hf/¹⁷⁷Hf	I_Hf	ε_Hf(t)	T_DM1 (Ma)	T_DM2 (Ma)	f_Lu/Hf
LDGH-6-02	288	0.035402	0.001217±0.000018	0.282749	0.282749	-0.82	676	1070	-0.96
LDGH-6-03	290	0.027025	0.000931±0.000018	0.282668	0.282668	-3.69	782	1247	-0.97
LDGH-6-04	291	0.021374	0.000803±0.000017	0.282758	0.282758	-0.49	656	1050	-0.98
LDGH-6-06	291	0.021978	0.000782±0.000017	0.282735	0.282735	-1.30	687	1100	-0.98
LDGH-6-07	286	0.026562	0.000900±0.000021	0.282791	0.282791	0.68	613	978	-0.97
LDGH-6-08	284	0.022164	0.000776±0.000018	0.282733	0.282733	-1.37	690	1104	-0.98
LDGH-6-09	287	0.019002	0.000704±0.000016	0.282714	0.282714	-2.05	714	1146	-0.98
LDGH-6-10	284	0.012006	0.000512±0.000014	0.282760	0.282760	-0.41	648	1045	-0.98
LDGH-6-11	284	0.017478	0.000591±0.000018	0.282756	0.282756	-0.55	655	1054	-0.98
LDGH-6-13	284	0.024901	0.000805±0.000016	0.282751	0.282751	-0.74	666	1065	-0.98
LDGH-6-14	286	0.023231	0.000748±0.000019	0.282765	0.282765	-0.26	647	1036	-0.98
LDGH-6-15	291	0.046419	0.001533±0.000017	0.282753	0.282753	-0.67	676	1060	-0.95
LDGH-6-16	284	0.017657	0.000687±0.000017	0.282800	0.282800	0.97	598	960	-0.98
LDGH-6-17	284	0.035624	0.001131±0.000018	0.282764	0.282764	-0.29	654	1037	-0.97
LDGH-6-18	284	0.024757	0.000803±0.000017	0.282768	0.282768	-0.16	644	1030	-0.98
LDGH-6-19	291	0.027720	0.000880±0.000020	0.282769	0.282769	-0.12	644	1027	-0.97
LDGH-6-20	287	0.027530	0.000885±0.000017	0.282794	0.282794	0.77	609	973	-0.97
LDGS06-01	241	0.024462	0.000821±0.000018	0.282684	0.282684	-3.12	758	1212	-0.98
LDGS06-02	241	0.022228	0.000738±0.000016	0.282665	0.282665	-3.80	782	1253	-0.98
LDGS06-03	247	0.028035	0.000919±0.000017	0.282715	0.282715	-2.01	717	1143	-0.97
LDGS06-04	243	0.014678	0.000486±0.000015	0.282741	0.282741	-1.09	674	1088	-0.99
LDGS06-05	242	0.025871	0.000881±0.000019	0.282715	0.282715	-2.01	716	1143	-0.97
LDGS06-06	244	0.018947	0.000638±0.000019	0.282732	0.282732	-1.40	689	1106	-0.98
LDGS06-07	244	0.022001	0.000714±0.000019	0.282695	0.282695	-2.71	740	1186	-0.98
LDGS06-08	245	0.015046	0.000500±0.000016	0.282713	0.282713	-2.08	712	1148	-0.98
LDGS06-09	244	0.022465	0.000738±0.000018	0.282706	0.282706	-2.32	725	1163	-0.98
LDGS06-10	241	0.015798	0.000522±0.000018	0.282677	0.282677	-3.34	761	1226	-0.98
LDGS06-11	244	0.020904	0.000701±0.000017	0.282708	0.282708	-2.26	722	1159	-0.98
LDGS06-12	243	0.024657	0.000822±0.000017	0.282723	0.282723	-1.74	705	1127	-0.98
LDGS06-13	247	0.018107	0.000592±0.000019	0.282674	0.282674	-3.45	766	1232	-0.98
LDGS06-14	241	0.021953	0.000735±0.000018	0.282710	0.282710	-2.21	721	1156	-0.98
LDGS06-15	247	0.017750	0.000584±0.000019	0.282637	0.282637	-4.76	816	1313	-0.98
LDGS06-16	241	0.023922	0.000821±0.000019	0.282721	0.282721	-1.82	708	1132	-0.98
LDGS06-17	245	0.022508	0.000722±0.000017	0.282695	0.282695	-2.73	741	1188	-0.98
LDGS06-18	243	0.023087	0.000771±0.000021	0.282734	0.282734	-1.34	689	1103	-0.98
LDGS06-19	247	0.022690	0.000746±0.000019	0.282702	0.282702	-2.49	732	1173	-0.98
LDGS06-20	243	0.019227	0.000655±0.000019	0.282740	0.282740	-1.14	679	1090	-0.98
LDGS06-21	245	0.015717	0.000529±0.000016	0.282733	0.282733	-1.37	685	1105	-0.98
LDGS06-22	242	0.015215	0.000511±0.000018	0.282693	0.282693	-2.81	740	1193	-0.98
LDGS06-23	243	0.027759	0.000925±0.000019	0.282706	0.282706	-2.34	730	1164	-0.97
LDGS06-24	244	0.019707	0.000671±0.000017	0.282744	0.282744	-1.01	674	1082	-0.98
LDGS06-25	245	0.022723	0.000776±0.000018	0.282716	0.282716	-2.00	714	1143	-0.98
LDGS06-26	242	0.025858	0.000854±0.000019	0.282724	0.282724	-1.70	704	1124	-0.97
LDGS06-27	241	0.026794	0.000892±0.000017	0.282651	0.282651	-4.27	803	1282	-0.97
LDGS06-28	247	0.024813	0.000844±0.000017	0.282691	0.282691	-2.86	748	1196	-0.97
LDGS06-29	244	0.029544	0.000980±0.000018	0.282770	0.282770	-0.07	643	1024	-0.97
LDGS06-30	240	0.020302	0.000675±0.000019	0.282707	0.282707	-2.29	723	1161	-0.98

Table 3 Zircon Lu-Hf isotope data of altered diorite porphyrite and diabase from the Laodonggou ore section Ⅱ

分析点号	²⁰⁶Pb/²³⁸U 年龄(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf±2σ	¹⁷⁶Hf/¹⁷⁷Hf	I_Hf	ε_Hf(t)	T_DM1 (Ma)	T_DM2 (Ma)	f_Lu/Hf
LDGH-6-02	288	0.035402	0.001217±0.000018	0.282749	0.282749	-0.82	676	1070	-0.96
LDGH-6-03	290	0.027025	0.000931±0.000018	0.282668	0.282668	-3.69	782	1247	-0.97
LDGH-6-04	291	0.021374	0.000803±0.000017	0.282758	0.282758	-0.49	656	1050	-0.98
LDGH-6-06	291	0.021978	0.000782±0.000017	0.282735	0.282735	-1.30	687	1100	-0.98
LDGH-6-07	286	0.026562	0.000900±0.000021	0.282791	0.282791	0.68	613	978	-0.97
LDGH-6-08	284	0.022164	0.000776±0.000018	0.282733	0.282733	-1.37	690	1104	-0.98
LDGH-6-09	287	0.019002	0.000704±0.000016	0.282714	0.282714	-2.05	714	1146	-0.98
LDGH-6-10	284	0.012006	0.000512±0.000014	0.282760	0.282760	-0.41	648	1045	-0.98
LDGH-6-11	284	0.017478	0.000591±0.000018	0.282756	0.282756	-0.55	655	1054	-0.98
LDGH-6-13	284	0.024901	0.000805±0.000016	0.282751	0.282751	-0.74	666	1065	-0.98
LDGH-6-14	286	0.023231	0.000748±0.000019	0.282765	0.282765	-0.26	647	1036	-0.98
LDGH-6-15	291	0.046419	0.001533±0.000017	0.282753	0.282753	-0.67	676	1060	-0.95
LDGH-6-16	284	0.017657	0.000687±0.000017	0.282800	0.282800	0.97	598	960	-0.98
LDGH-6-17	284	0.035624	0.001131±0.000018	0.282764	0.282764	-0.29	654	1037	-0.97
LDGH-6-18	284	0.024757	0.000803±0.000017	0.282768	0.282768	-0.16	644	1030	-0.98
LDGH-6-19	291	0.027720	0.000880±0.000020	0.282769	0.282769	-0.12	644	1027	-0.97
LDGH-6-20	287	0.027530	0.000885±0.000017	0.282794	0.282794	0.77	609	973	-0.97
LDGS06-01	241	0.024462	0.000821±0.000018	0.282684	0.282684	-3.12	758	1212	-0.98
LDGS06-02	241	0.022228	0.000738±0.000016	0.282665	0.282665	-3.80	782	1253	-0.98
LDGS06-03	247	0.028035	0.000919±0.000017	0.282715	0.282715	-2.01	717	1143	-0.97
LDGS06-04	243	0.014678	0.000486±0.000015	0.282741	0.282741	-1.09	674	1088	-0.99
LDGS06-05	242	0.025871	0.000881±0.000019	0.282715	0.282715	-2.01	716	1143	-0.97
LDGS06-06	244	0.018947	0.000638±0.000019	0.282732	0.282732	-1.40	689	1106	-0.98
LDGS06-07	244	0.022001	0.000714±0.000019	0.282695	0.282695	-2.71	740	1186	-0.98
LDGS06-08	245	0.015046	0.000500±0.000016	0.282713	0.282713	-2.08	712	1148	-0.98
LDGS06-09	244	0.022465	0.000738±0.000018	0.282706	0.282706	-2.32	725	1163	-0.98
LDGS06-10	241	0.015798	0.000522±0.000018	0.282677	0.282677	-3.34	761	1226	-0.98
LDGS06-11	244	0.020904	0.000701±0.000017	0.282708	0.282708	-2.26	722	1159	-0.98
LDGS06-12	243	0.024657	0.000822±0.000017	0.282723	0.282723	-1.74	705	1127	-0.98
LDGS06-13	247	0.018107	0.000592±0.000019	0.282674	0.282674	-3.45	766	1232	-0.98
LDGS06-14	241	0.021953	0.000735±0.000018	0.282710	0.282710	-2.21	721	1156	-0.98
LDGS06-15	247	0.017750	0.000584±0.000019	0.282637	0.282637	-4.76	816	1313	-0.98
LDGS06-16	241	0.023922	0.000821±0.000019	0.282721	0.282721	-1.82	708	1132	-0.98
LDGS06-17	245	0.022508	0.000722±0.000017	0.282695	0.282695	-2.73	741	1188	-0.98
LDGS06-18	243	0.023087	0.000771±0.000021	0.282734	0.282734	-1.34	689	1103	-0.98
LDGS06-19	247	0.022690	0.000746±0.000019	0.282702	0.282702	-2.49	732	1173	-0.98
LDGS06-20	243	0.019227	0.000655±0.000019	0.282740	0.282740	-1.14	679	1090	-0.98
LDGS06-21	245	0.015717	0.000529±0.000016	0.282733	0.282733	-1.37	685	1105	-0.98
LDGS06-22	242	0.015215	0.000511±0.000018	0.282693	0.282693	-2.81	740	1193	-0.98
LDGS06-23	243	0.027759	0.000925±0.000019	0.282706	0.282706	-2.34	730	1164	-0.97
LDGS06-24	244	0.019707	0.000671±0.000017	0.282744	0.282744	-1.01	674	1082	-0.98
LDGS06-25	245	0.022723	0.000776±0.000018	0.282716	0.282716	-2.00	714	1143	-0.98
LDGS06-26	242	0.025858	0.000854±0.000019	0.282724	0.282724	-1.70	704	1124	-0.97
LDGS06-27	241	0.026794	0.000892±0.000017	0.282651	0.282651	-4.27	803	1282	-0.97
LDGS06-28	247	0.024813	0.000844±0.000017	0.282691	0.282691	-2.86	748	1196	-0.97
LDGS06-29	244	0.029544	0.000980±0.000018	0.282770	0.282770	-0.07	643	1024	-0.97
LDGS06-30	240	0.020302	0.000675±0.000019	0.282707	0.282707	-2.29	723	1161	-0.98

Table 4 Whole-rock geochemical data of altered diorite porphyrite and diabase from the Laodonggou ore section Ⅱ (%)

组分/参数	LDGS-11	LDGS-22	LDGS-33	LDGS-44	LDGS-55	LDGH-16	LDGH-27	LDGH-38	LDGH-49	LDGH-510
SiO₂	63.23	62.72	63.82	63.19	61.84	51.69	48.79	50.66	51.12	51.14
TiO₂	0.49	0.50	0.46	0.50	0.53	2.24	2.41	2.44	2.36	3.00
Al₂O₃	14.84	14.85	14.68	14.87	15.01	13.90	13.95	13.07	13.87	12.85
TFe₂O₃	3.38	3.61	3.34	3.55	3.72	11.73	11.65	11.67	11.75	12.51
MnO	0.04	0.05	0.04	0.04	0.04	0.12	0.14	0.12	0.13	0.14
MgO	2.63	2.74	2.54	2.62	2.90	4.84	4.92	4.30	4.74	4.73
CaO	2.87	2.96	2.85	3.01	2.58	6.23	7.13	6.17	6.18	6.03
Na₂O	2.56	2.38	2.69	2.73	2.09	1.94	1.74	2.46	2.57	2.54
K₂O	4.60	4.50	4.54	4.43	4.22	1.43	1.66	1.35	1.40	1.39
P₂O₅	0.23	0.23	0.21	0.23	0.24	0.28	0.32	0.32	0.30	0.34
烧失量	4.22	4.54	3.90	3.90	5.69	4.77	6.31	6.42	4.70	4.50
总量	99.08	99.07	99.07	99.08	98.85	99.15	99.02	99.00	99.12	99.17
全碱	7.16	6.88	7.23	7.17	6.31	3.36	3.40	3.81	3.98	3.93
K₂O/Na₂O	1.80	1.89	1.69	1.62	2.01	0.74	0.95	0.55	0.55	0.54
A/CNK	1.03	1.05	1.01	1.01	1.18	0.87	0.79	0.78	0.82	0.77
A/NK	1.62	1.69	1.57	1.60	1.87	2.94	3.00	2.37	2.41	2.26
V	54.30	53.80	48.7	52.30	57.30	123.00	115.00	117.00	113.00	139.00
Cr	64.60	69.30	58.4	64.00	85.70	109.00	97.60	89.00	107.00	81.10
Co	7.74	8.02	6.71	8.02	8.39	29.20	28.20	27.90	26.90	29.30
Ni	32.30	32.00	29.4	31.70	35.30	54.90	51.30	47.60	53.30	47.70
Ga	18.20	17.90	17.80	17.80	18.10	24.6	24.60	24.30	23.70	24.60
Li	39.50	38.40	33.30	38.60	32.80	23.70	25.30	31.90	21.20	20.10
Be	3.04	2.94	2.88	2.92	2.44	1.35	1.50	1.44	1.33	1.73
Cs	1132.91	1008.86	1067.09	1316.46	615.19	179.75	222.78	225.32	116.46	220.25
Rb	266.14	264.57	256.69	245.67	203.15	69.61	77.32	57.48	55.75	66.46
Th	181.18	170.59	172.94	184.71	156.47	28.94	32.00	32.71	38.47	34.82
U	162.86	168.57	169.05	176.19	111.43	27.14	28.57	28.57	26.67	30.95
Nb	10.62	10.01	10.24	9.92	9.65	32.82	39.69	40.25	35.20	42.64
Ta	14.63	13.90	14.15	13.66	12.68	33.66	40.24	40.73	36.59	44.15
La	61.28	57.93	58.81	66.96	63.61	25.18	27.80	27.80	24.31	29.26
Ce	47.38	42.20	45.80	51.61	51.61	20.73	22.70	22.42	20.23	23.72
Pr	120.99	115.49	116.20	131.83	131.41	65.77	71.83	70.99	64.65	76.90
Sr	31.00	30.43	33.74	35.36	26.73	14.69	16.30	12.56	16.40	16.97
Nd	24.52	23.41	23.56	26.88	26.51	18.02	19.65	19.28	17.73	20.83
Zr	30.98	22.32	22.23	24.20	21.70	17.77	19.46	20.18	18.13	20.98
Hf	21.59	16.80	16.73	17.99	15.95	14.05	15.08	15.60	14.40	16.67
Sm	12.12	11.37	11.49	13.22	13.06	15.38	16.87	16.33	15.43	17.93
Eu	8.87	8.81	8.81	10.54	9.35	13.93	15.00	14.52	13.57	15.48
Gd	7.99	7.57	7.72	8.83	8.44	12.03	13.15	12.42	12.01	13.86
Tb	5.00	4.81	4.81	5.46	5.28	10.00	10.74	10.09	10.00	11.30
Dy	3.49	3.38	3.41	3.79	3.60	7.82	8.45	7.77	7.86	8.71
Y	2.73	2.64	2.64	2.88	2.70	5.25	5.49	5.16	5.05	5.54
Ho	2.87	2.74	2.74	3.05	2.87	6.04	6.40	6.04	5.98	6.52
Er	2.98	2.85	2.83	3.06	2.92	5.19	5.38	5.15	5.15	5.56
Tm	2.70	2.43	2.57	2.70	2.57	3.92	3.92	4.05	3.92	4.19
Yb	2.52	2.45	2.41	2.56	2.41	3.35	3.33	3.35	3.37	3.55
Lu	2.70	2.57	2.57	2.70	2.43	3.11	2.97	3.11	3.11	3.24
La	177.64	167.93	170.46	194.09	184.39	73.00	80.59	80.59	70.46	84.81
Ce	137.42	122.39	132.84	149.67	149.67	60.13	65.85	65.03	58.66	68.79
Pr	90.42	86.32	86.84	98.53	98.21	49.16	53.68	53.05	48.32	57.47
Nd	71.09	67.88	68.31	77.94	76.87	52.25	56.96	55.89	51.39	60.39
Sm	35.16	33.01	33.33	38.37	37.91	44.64	48.95	47.39	44.77	52.03
Eu	25.69	25.52	25.52	30.52	27.07	40.34	43.45	42.07	39.31	44.83
Gd	23.16	21.95	22.38	25.60	24.48	34.89	38.15	36.01	34.84	40.19
Tb	14.44	13.90	13.90	15.78	15.24	28.88	31.02	29.14	28.88	32.62
Dy	10.12	9.80	9.88	10.98	10.43	22.68	24.53	22.56	22.80	25.28
Ho	8.30	7.95	7.95	8.83	8.30	17.49	18.55	17.49	17.31	18.90
Er	8.64	8.28	8.22	8.88	8.46	15.05	15.59	14.92	14.92	16.13
Tm	7.84	7.06	7.45	7.84	7.45	11.37	11.37	11.76	11.37	12.16
Yb	7.29	7.12	7.00	7.41	7.00	9.71	9.65	9.71	9.76	10.29
Lu	7.87	7.48	7.48	7.87	7.09	9.06	8.66	9.06	9.06	9.45
∑REE	186.27	172.05	179.44	203.27	199.58	112.00	122.12	119.59	109.98	128.36
LREE	174.86	161.13	168.43	191.00	187.9	92.34	101.11	99.73	90.32	106.42
HREE	11.41	10.92	11.01	12.27	11.68	19.66	21.01	19.86	19.66	21.94
LREE/HREE	15.33	14.76	15.30	15.57	16.09	4.70	4.81	5.02	4.59	4.85
(La/Yb)_N	24.35	23.59	24.35	26.19	26.34	7.52	8.35	8.30	7.22	8.24
δEu	0.90	0.95	0.93	0.97	0.89	1.02	1.01	1.02	1.00	0.98

Table 4 Whole-rock geochemical data of altered diorite porphyrite and diabase from the Laodonggou ore section Ⅱ (%)

组分/参数	LDGS-11	LDGS-22	LDGS-33	LDGS-44	LDGS-55	LDGH-16	LDGH-27	LDGH-38	LDGH-49	LDGH-510
SiO₂	63.23	62.72	63.82	63.19	61.84	51.69	48.79	50.66	51.12	51.14
TiO₂	0.49	0.50	0.46	0.50	0.53	2.24	2.41	2.44	2.36	3.00
Al₂O₃	14.84	14.85	14.68	14.87	15.01	13.90	13.95	13.07	13.87	12.85
TFe₂O₃	3.38	3.61	3.34	3.55	3.72	11.73	11.65	11.67	11.75	12.51
MnO	0.04	0.05	0.04	0.04	0.04	0.12	0.14	0.12	0.13	0.14
MgO	2.63	2.74	2.54	2.62	2.90	4.84	4.92	4.30	4.74	4.73
CaO	2.87	2.96	2.85	3.01	2.58	6.23	7.13	6.17	6.18	6.03
Na₂O	2.56	2.38	2.69	2.73	2.09	1.94	1.74	2.46	2.57	2.54
K₂O	4.60	4.50	4.54	4.43	4.22	1.43	1.66	1.35	1.40	1.39
P₂O₅	0.23	0.23	0.21	0.23	0.24	0.28	0.32	0.32	0.30	0.34
烧失量	4.22	4.54	3.90	3.90	5.69	4.77	6.31	6.42	4.70	4.50
总量	99.08	99.07	99.07	99.08	98.85	99.15	99.02	99.00	99.12	99.17
全碱	7.16	6.88	7.23	7.17	6.31	3.36	3.40	3.81	3.98	3.93
K₂O/Na₂O	1.80	1.89	1.69	1.62	2.01	0.74	0.95	0.55	0.55	0.54
A/CNK	1.03	1.05	1.01	1.01	1.18	0.87	0.79	0.78	0.82	0.77
A/NK	1.62	1.69	1.57	1.60	1.87	2.94	3.00	2.37	2.41	2.26
V	54.30	53.80	48.7	52.30	57.30	123.00	115.00	117.00	113.00	139.00
Cr	64.60	69.30	58.4	64.00	85.70	109.00	97.60	89.00	107.00	81.10
Co	7.74	8.02	6.71	8.02	8.39	29.20	28.20	27.90	26.90	29.30
Ni	32.30	32.00	29.4	31.70	35.30	54.90	51.30	47.60	53.30	47.70
Ga	18.20	17.90	17.80	17.80	18.10	24.6	24.60	24.30	23.70	24.60
Li	39.50	38.40	33.30	38.60	32.80	23.70	25.30	31.90	21.20	20.10
Be	3.04	2.94	2.88	2.92	2.44	1.35	1.50	1.44	1.33	1.73
Cs	1132.91	1008.86	1067.09	1316.46	615.19	179.75	222.78	225.32	116.46	220.25
Rb	266.14	264.57	256.69	245.67	203.15	69.61	77.32	57.48	55.75	66.46
Th	181.18	170.59	172.94	184.71	156.47	28.94	32.00	32.71	38.47	34.82
U	162.86	168.57	169.05	176.19	111.43	27.14	28.57	28.57	26.67	30.95
Nb	10.62	10.01	10.24	9.92	9.65	32.82	39.69	40.25	35.20	42.64
Ta	14.63	13.90	14.15	13.66	12.68	33.66	40.24	40.73	36.59	44.15
La	61.28	57.93	58.81	66.96	63.61	25.18	27.80	27.80	24.31	29.26
Ce	47.38	42.20	45.80	51.61	51.61	20.73	22.70	22.42	20.23	23.72
Pr	120.99	115.49	116.20	131.83	131.41	65.77	71.83	70.99	64.65	76.90
Sr	31.00	30.43	33.74	35.36	26.73	14.69	16.30	12.56	16.40	16.97
Nd	24.52	23.41	23.56	26.88	26.51	18.02	19.65	19.28	17.73	20.83
Zr	30.98	22.32	22.23	24.20	21.70	17.77	19.46	20.18	18.13	20.98
Hf	21.59	16.80	16.73	17.99	15.95	14.05	15.08	15.60	14.40	16.67
Sm	12.12	11.37	11.49	13.22	13.06	15.38	16.87	16.33	15.43	17.93
Eu	8.87	8.81	8.81	10.54	9.35	13.93	15.00	14.52	13.57	15.48
Gd	7.99	7.57	7.72	8.83	8.44	12.03	13.15	12.42	12.01	13.86
Tb	5.00	4.81	4.81	5.46	5.28	10.00	10.74	10.09	10.00	11.30
Dy	3.49	3.38	3.41	3.79	3.60	7.82	8.45	7.77	7.86	8.71
Y	2.73	2.64	2.64	2.88	2.70	5.25	5.49	5.16	5.05	5.54
Ho	2.87	2.74	2.74	3.05	2.87	6.04	6.40	6.04	5.98	6.52
Er	2.98	2.85	2.83	3.06	2.92	5.19	5.38	5.15	5.15	5.56
Tm	2.70	2.43	2.57	2.70	2.57	3.92	3.92	4.05	3.92	4.19
Yb	2.52	2.45	2.41	2.56	2.41	3.35	3.33	3.35	3.37	3.55
Lu	2.70	2.57	2.57	2.70	2.43	3.11	2.97	3.11	3.11	3.24
La	177.64	167.93	170.46	194.09	184.39	73.00	80.59	80.59	70.46	84.81
Ce	137.42	122.39	132.84	149.67	149.67	60.13	65.85	65.03	58.66	68.79
Pr	90.42	86.32	86.84	98.53	98.21	49.16	53.68	53.05	48.32	57.47
Nd	71.09	67.88	68.31	77.94	76.87	52.25	56.96	55.89	51.39	60.39
Sm	35.16	33.01	33.33	38.37	37.91	44.64	48.95	47.39	44.77	52.03
Eu	25.69	25.52	25.52	30.52	27.07	40.34	43.45	42.07	39.31	44.83
Gd	23.16	21.95	22.38	25.60	24.48	34.89	38.15	36.01	34.84	40.19
Tb	14.44	13.90	13.90	15.78	15.24	28.88	31.02	29.14	28.88	32.62
Dy	10.12	9.80	9.88	10.98	10.43	22.68	24.53	22.56	22.80	25.28
Ho	8.30	7.95	7.95	8.83	8.30	17.49	18.55	17.49	17.31	18.90
Er	8.64	8.28	8.22	8.88	8.46	15.05	15.59	14.92	14.92	16.13
Tm	7.84	7.06	7.45	7.84	7.45	11.37	11.37	11.76	11.37	12.16
Yb	7.29	7.12	7.00	7.41	7.00	9.71	9.65	9.71	9.76	10.29
Lu	7.87	7.48	7.48	7.87	7.09	9.06	8.66	9.06	9.06	9.45
∑REE	186.27	172.05	179.44	203.27	199.58	112.00	122.12	119.59	109.98	128.36
LREE	174.86	161.13	168.43	191.00	187.9	92.34	101.11	99.73	90.32	106.42
HREE	11.41	10.92	11.01	12.27	11.68	19.66	21.01	19.86	19.66	21.94
LREE/HREE	15.33	14.76	15.30	15.57	16.09	4.70	4.81	5.02	4.59	4.85
(La/Yb)_N	24.35	23.59	24.35	26.19	26.34	7.52	8.35	8.30	7.22	8.24
δEu	0.90	0.95	0.93	0.97	0.89	1.02	1.01	1.02	1.00	0.98

Fig.8 SiO2-K2O diagram of altered diorite porphyrite and diabase from the Laodonggou ore section Ⅱ ((a), basemap from Richwood[26]), and aluminum saturation index diagram ((b), basemap from Maniar et al.[27])

Fig.9 Chondrite-normalized REE distribution patterns (a) and primitive mantle-normalized multi-elements spidergram (b) of altered diorite porphyrite and diabase from the Laodonggou ore section Ⅱ

Fig.10 Crosscutting relationship between gold ore body and altered diorite porphyrite from the Laodonggou gold deposit

Fig.11 Zircon εHf(t)-206Pb/238U diagram for the altered diorite porphyrite and diabase in the Laodonggou ore section Ⅱ

Fig.12 Tectonic discrimination diagrams for the Laodonggou gold deposit (basemap from Pearce[33] and Wood[34])

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