Geological and Geochemical Characteristics of Ore-forming Granite Porphyry and Its Metallogenic Significance in the Zhalageamu Copper Deposit, Inner Mongolia

doi:10.19657/j.geoscience.1000-8527.2023.016

Abstract

Abstract:

The Zhalageamu copper deposit is located in the northeastern margin of the ancient Xilinhot Block, and is a recently discovered medium-sized hydrothermal copper deposit in the Zn-Pb-Ag metallogenic belt (western slope of the south-central Greater Khingan Range) in Inner Mongolia.Studies on its magmatic and metallogenic mechanism provides the theoretical basis for copper exploration and broadens the exploration direction.The granite porphyry is closely space-time associated with Cu mineralization of the Zhalageamu copper deposit.To clarify the formation age and source characteristics of the granite porphyry from Zhalageamu, and to address the magmatic-metallogenic relationship, the granite porphyry was collected for petrography and geochemical analysis, zircon U-Pb dating and Sr-Nd isotope analysis.The result shows that the granite porphyry from Zhalageamu is characterized by high SiO₂ and Al₂O₃, low MgO, and enrichments in Rb, K, La, and Th and depletions in Ta, Nb, Ti, and P.All of the samples are characterized by the enrichment of LREEs relative to HREEs, and weak negative Eu anomaly.This indicates that the granite porphyry belongs to high-K calc-alkaline I-type granite.The granite porphyry has ε_Nd(t)=2.1 to 3.3 and young Nd model age of 980-740 Ma, indicating that the primary magma of the granite porphyry is derved from the mixture of crust and mantle materials.The magmatic zircon age of the granite porphyry is 254.51± 2.13 Ma, indicating that the granite porphyry and relevant Cu mineralization generated in the Late Permian.A comprehensive analysis supports that the Zhalageamu copper deposit was formed in a Late Permian volcanic arc setting, which may be closely related to the subduction of the Hegenshan oceanic Plate.

Key words: Zhalageamu copper deposit, granite porphyry, petrogeochemistry, zircon U-Pb dating, Sr-Nd isotope

CLC Number:

SONG Yanbo, WANG Jianping, SHEN Cunli, CHE Dong, YANG Wenhua, GUO Haijiao. Geological and Geochemical Characteristics of Ore-forming Granite Porphyry and Its Metallogenic Significance in the Zhalageamu Copper Deposit, Inner Mongolia[J]. Geoscience, 2023, 37(06): 1482-1494.

Figures/Tables 16

References 40

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样品号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
ZLG-6-1	71.30	0.43	13.36	2.89	1.44	1.37	4.24	2.48	0.12	1.52	99.14
ZLG-6-2	69.83	0.41	14.55	3.14	1.42	1.54	4.11	2.23	0.11	2.05	99.18
ZLG-6-3	68.51	0.43	14.48	4.22	1.52	1.32	4.24	2.53	0.11	1.85	99.20
ZLG-26-1	75.36	0.38	11.92	0.84	1.21	0.48	2.61	5.82	0.07	0.69	99.15
ZLG-26-2	75.41	0.29	11.94	0.59	0.54	1.69	3.78	3.57	0.06	1.21	99.08
ZLG-64	74.34	0.14	11.87	3.02	0.45	0.39	5.61	1.76	0.03	1.41	99.02
ZLG-65	72.26	0.24	13.53	1.72	0.71	0.91	3.53	5.01	0.05	1.23	99.19
ZLG-66	72.87	0.36	12.67	2.44	0.95	0.93	3.15	4.25	0.09	1.43	99.16
样品号	Mg^#	Sc	Ti	Cr	Co	Ni	Rb	Sr	Y	Zr	Nb
ZLG-6-1	49.9	6.033	2571	33.77	5.046	9.91	133.2	238.1	11.098	163.15	4.77
ZLG-6-2	47.4	6.278	2570	31.96	4.626	7.07	123.8	216.8	11.178	141.26	4.99
ZLG-6-3	41.9	6.929	2654	35.15	5.109	7.47	157.8	258.1	10.635	135.28	5.08
ZLG-26-1	70.4	5.513	2310	34.71	1.899	10.49	328.8	48.9	5.946	122.04	5.98
样品号	Mg^#	Sc	Ti	Cr	Co	Ni	Rb	Sr	Y	Zr	Nb
ZLG-26-2	64.6	4.224	1750	22.69	2.448	15.37	204.3	62.4	10.583	100.56	4.52
ZLG-64	23.2	3.557	881	3.41	9.403	8.46	105.6	78.3	29.971	77.34	4.39
ZLG-65	45.2	4.865	1487	7.19	1.342	5.34	210.4	84.2	26.323	118.63	6.39
ZLG-66	43.7	5.85	2156	12.99	3.632	7.93	243.2	96.4	19.516	123.91	6.96
样品号	Ba	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho
ZLG-6-1	346.2	15.69	32.193	3.572	13.957	2.665	0.676	2.329	0.341	2.113	0.392
ZLG-6-2	355.2	17.34	35.721	3.994	15.679	2.995	0.747	2.558	0.357	2.134	0.389
ZLG-6-3	364.6	14.39	29.064	3.281	13.062	2.535	0.722	2.289	0.331	2.023	0.373
ZLG-26-1	467.1	3.73	8.978	1.134	5.041	1.198	0.367	1.173	0.177	1.113	0.218
ZLG-26-2	242.8	5.72	12.953	1.596	6.903	1.593	0.425	1.597	0.256	1.671	0.337
ZLG-64	175.3	24.26	49.308	5.718	23.646	5.273	0.963	5.538	0.876	5.672	1.081
ZLG-65	334.2	23.06	49.061	5.427	20.475	4.178	0.506	3.973	0.659	4.428	0.885
ZLG-66	377.6	19.68	40.887	4.568	17.564	3.612	0.602	3.539	0.563	3.604	0.684
样品号	Er	Tm	Yb	Hf	Lu	Ta	Pb	Th	U	Hf	Lu
ZLG-6-1	1.173	0.153	1.053	3.739	0.146	0.28	15.164	6.791	4.632	3.739	0.146
ZLG-6-2	1.162	0.155	1.049	3.475	0.147	0.287	13.692	7.123	2.454	3.475	0.147
ZLG-6-3	1.122	0.146	1.006	3.331	0.142	0.445	8.591	6.748	2.348	3.331	0.141
ZLG-26-1	0.711	0.105	0.837	2.904	0.136	0.372	13.444	6.015	1.591	2.904	0.136
ZLG-26-2	1.074	0.154	1.124	2.367	0.171	0.424	10.339	4.694	1.355	2.367	0.173
ZLG-64	3.275	0.442	3.027	2.112	0.406	0.671	7.493	10.155	3.199	2.112	0.406
ZLG-65	2.813	0.404	2.845	3.331	0.399	0.618	22.799	17.691	5.064	3.331	0.399
ZLG-66	2.071	0.284	1.936	3.234	0.275	0.418	12.531	13.287	3.192	3.234	0.275

样品号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
ZLG-6-1	71.30	0.43	13.36	2.89	1.44	1.37	4.24	2.48	0.12	1.52	99.14
ZLG-6-2	69.83	0.41	14.55	3.14	1.42	1.54	4.11	2.23	0.11	2.05	99.18
ZLG-6-3	68.51	0.43	14.48	4.22	1.52	1.32	4.24	2.53	0.11	1.85	99.20
ZLG-26-1	75.36	0.38	11.92	0.84	1.21	0.48	2.61	5.82	0.07	0.69	99.15
ZLG-26-2	75.41	0.29	11.94	0.59	0.54	1.69	3.78	3.57	0.06	1.21	99.08
ZLG-64	74.34	0.14	11.87	3.02	0.45	0.39	5.61	1.76	0.03	1.41	99.02
ZLG-65	72.26	0.24	13.53	1.72	0.71	0.91	3.53	5.01	0.05	1.23	99.19
ZLG-66	72.87	0.36	12.67	2.44	0.95	0.93	3.15	4.25	0.09	1.43	99.16
样品号	Mg^#	Sc	Ti	Cr	Co	Ni	Rb	Sr	Y	Zr	Nb
ZLG-6-1	49.9	6.033	2571	33.77	5.046	9.91	133.2	238.1	11.098	163.15	4.77
ZLG-6-2	47.4	6.278	2570	31.96	4.626	7.07	123.8	216.8	11.178	141.26	4.99
ZLG-6-3	41.9	6.929	2654	35.15	5.109	7.47	157.8	258.1	10.635	135.28	5.08
ZLG-26-1	70.4	5.513	2310	34.71	1.899	10.49	328.8	48.9	5.946	122.04	5.98
样品号	Mg^#	Sc	Ti	Cr	Co	Ni	Rb	Sr	Y	Zr	Nb
ZLG-26-2	64.6	4.224	1750	22.69	2.448	15.37	204.3	62.4	10.583	100.56	4.52
ZLG-64	23.2	3.557	881	3.41	9.403	8.46	105.6	78.3	29.971	77.34	4.39
ZLG-65	45.2	4.865	1487	7.19	1.342	5.34	210.4	84.2	26.323	118.63	6.39
ZLG-66	43.7	5.85	2156	12.99	3.632	7.93	243.2	96.4	19.516	123.91	6.96
样品号	Ba	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho
ZLG-6-1	346.2	15.69	32.193	3.572	13.957	2.665	0.676	2.329	0.341	2.113	0.392
ZLG-6-2	355.2	17.34	35.721	3.994	15.679	2.995	0.747	2.558	0.357	2.134	0.389
ZLG-6-3	364.6	14.39	29.064	3.281	13.062	2.535	0.722	2.289	0.331	2.023	0.373
ZLG-26-1	467.1	3.73	8.978	1.134	5.041	1.198	0.367	1.173	0.177	1.113	0.218
ZLG-26-2	242.8	5.72	12.953	1.596	6.903	1.593	0.425	1.597	0.256	1.671	0.337
ZLG-64	175.3	24.26	49.308	5.718	23.646	5.273	0.963	5.538	0.876	5.672	1.081
ZLG-65	334.2	23.06	49.061	5.427	20.475	4.178	0.506	3.973	0.659	4.428	0.885
ZLG-66	377.6	19.68	40.887	4.568	17.564	3.612	0.602	3.539	0.563	3.604	0.684
样品号	Er	Tm	Yb	Hf	Lu	Ta	Pb	Th	U	Hf	Lu
ZLG-6-1	1.173	0.153	1.053	3.739	0.146	0.28	15.164	6.791	4.632	3.739	0.146
ZLG-6-2	1.162	0.155	1.049	3.475	0.147	0.287	13.692	7.123	2.454	3.475	0.147
ZLG-6-3	1.122	0.146	1.006	3.331	0.142	0.445	8.591	6.748	2.348	3.331	0.141
ZLG-26-1	0.711	0.105	0.837	2.904	0.136	0.372	13.444	6.015	1.591	2.904	0.136
ZLG-26-2	1.074	0.154	1.124	2.367	0.171	0.424	10.339	4.694	1.355	2.367	0.173
ZLG-64	3.275	0.442	3.027	2.112	0.406	0.671	7.493	10.155	3.199	2.112	0.406
ZLG-65	2.813	0.404	2.845	3.331	0.399	0.618	22.799	17.691	5.064	3.331	0.399
ZLG-66	2.071	0.284	1.936	3.234	0.275	0.418	12.531	13.287	3.192	3.234	0.275

样品编号	元素含量 (10^-6)					²³²Th/ ²³⁸U	同位素比值			年龄 (Ma)			谐和度 (%)
样品编号	²⁰⁶Pb		²³⁸U		²³²Th	²³²Th/ ²³⁸U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	谐和度 (%)
ZLG-22-4	2.0817	484.09		214.53		0.44	0.0531± 0.0036	0.2956± 0.0181	0.0402± 0.0008	331.54± 153.6830	262.94± 14.2592	254.46± 4.8230	96
ZLG-22-6	0.0917	332.75		171.95		0.52	0.0544± 0.0074	0.2949± 0.0354	0.0395± 0.0011	387.09± 307.3680	262.43± 27.0588	250.11± 7.0920	95
ZLG-22-7	0.7494	458.93		233.51		0.51	0.0529± 0.0032	0.2932± 0.0165	0.0399± 0.0006	324.13± 132.3900	261.07± 12.6790	252.22± 3.9420	96
ZLG-22-8	1.1862	407.11		244.18		0.60	0.0503± 0.0042	0.2909± 0.0241	0.0411± 0.0008	209.33± 4.6300	259.31± 18.8419	259.78± 5.1700	99
ZLG-22-9	0.5036	448.42		199.59		0.45	0.0518± 0.0029	0.2883± 0.0165	0.0401± 0.0007	279.69± 160.1650	257.28± 12.2389	253.47± 4.1580	98
ZLG-22-11	0.0917	351.28		243.92		0.69	0.0538± 0.0050	0.2936± 0.0257	0.0398± 0.0010	361.17± 213.8630	261.46± 19.3354	251.86± 6.4871	96
ZLG-22-12	1.1402	335.09		146.00		0.44	0.0522± 0.0040	0.2907± 0.0224	0.0403± 0.0008	294.51± 175.9030	259.16± 17.5984	254.79± 5.1493	98
ZLG-22-13	0.7494	416.34		222.29		0.53	0.0530± 0.0033	0.2912± 0.0175	0.0396± 0.0007	327.84± 136.0930	259.55± 13.5015	250.43± 4.2806	96
ZLG-22-14	0.5042	351.60		185.95		0.53	0.0528± 0.0035	0.2877± 0.0177	0.0400± 0.0008	320.43± 151.8330	256.78± 13.4575	253.29± 4.7386	98
ZLG-22-16	0.3047	247.92		97.98		0.40	0.0548± 0.0051	0.2973± 0.0268	0.0396± 0.0008	466.71± 211.0800	264.31± 20.6215	250.41± 4.7054	94
ZLG-22-17	2.1587	461.24		327.07		0.71	0.0538± 0.0034	0.2954± 0.0181	0.0396± 0.0007	364.87± 144.4280	262.81± 14.0484	250.68± 4.2119	95
ZLG-22-20	2.4374	227.64		102.24		0.45	0.0547± 0.0067	0.2916± 0.0303	0.0401± 0.0010	466.71± 275.8900	259.82± 23.4196	253.60± 6.3016	97
ZLG-22-22	0.6650	346.50		178.91		0.52	0.0506± 0.0045	0.2891± 0.0262	0.0408± 0.0009	220.44± 196.2750	257.88± 20.1280	258.22± 5.7015	99
ZLG-22-23	0.2382	379.90		132.01		0.35	0.0524± 0.0045	0.2805± 0.0211	0.0400± 0.0010	305.62± 202.7530	251.13± 16.3184	253.34± 6.2258	99
ZLG-22-25	0.6496	362.72		146.31		0.40	0.0539± 0.0044	0.2887± 0.0215	0.0399± 0.0009	368.57± 183.3100	257.58± 16.2335	252.39± 5.5236	97
ZLG-22-26	1.5691	376.49		212.50		0.56	0.0507± 0.0046	0.2911± 0.0251	0.0413± 0.0008	227.85± 16.6650	259.49± 19.3279	261.40± 4.9738	99
ZLG-22-27	1.9669	414.77		176.72		0.43	0.0521± 0.0034	0.2937± 0.0195	0.0410± 0.0008	300.06± 115.7280	261.48± 14.8045	259.13± 4.9481	99

样品编号	元素含量 (10^-6)					²³²Th/ ²³⁸U	同位素比值			年龄 (Ma)			谐和度 (%)
样品编号	²⁰⁶Pb		²³⁸U		²³²Th	²³²Th/ ²³⁸U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	谐和度 (%)
ZLG-22-4	2.0817	484.09		214.53		0.44	0.0531± 0.0036	0.2956± 0.0181	0.0402± 0.0008	331.54± 153.6830	262.94± 14.2592	254.46± 4.8230	96
ZLG-22-6	0.0917	332.75		171.95		0.52	0.0544± 0.0074	0.2949± 0.0354	0.0395± 0.0011	387.09± 307.3680	262.43± 27.0588	250.11± 7.0920	95
ZLG-22-7	0.7494	458.93		233.51		0.51	0.0529± 0.0032	0.2932± 0.0165	0.0399± 0.0006	324.13± 132.3900	261.07± 12.6790	252.22± 3.9420	96
ZLG-22-8	1.1862	407.11		244.18		0.60	0.0503± 0.0042	0.2909± 0.0241	0.0411± 0.0008	209.33± 4.6300	259.31± 18.8419	259.78± 5.1700	99
ZLG-22-9	0.5036	448.42		199.59		0.45	0.0518± 0.0029	0.2883± 0.0165	0.0401± 0.0007	279.69± 160.1650	257.28± 12.2389	253.47± 4.1580	98
ZLG-22-11	0.0917	351.28		243.92		0.69	0.0538± 0.0050	0.2936± 0.0257	0.0398± 0.0010	361.17± 213.8630	261.46± 19.3354	251.86± 6.4871	96
ZLG-22-12	1.1402	335.09		146.00		0.44	0.0522± 0.0040	0.2907± 0.0224	0.0403± 0.0008	294.51± 175.9030	259.16± 17.5984	254.79± 5.1493	98
ZLG-22-13	0.7494	416.34		222.29		0.53	0.0530± 0.0033	0.2912± 0.0175	0.0396± 0.0007	327.84± 136.0930	259.55± 13.5015	250.43± 4.2806	96
ZLG-22-14	0.5042	351.60		185.95		0.53	0.0528± 0.0035	0.2877± 0.0177	0.0400± 0.0008	320.43± 151.8330	256.78± 13.4575	253.29± 4.7386	98
ZLG-22-16	0.3047	247.92		97.98		0.40	0.0548± 0.0051	0.2973± 0.0268	0.0396± 0.0008	466.71± 211.0800	264.31± 20.6215	250.41± 4.7054	94
ZLG-22-17	2.1587	461.24		327.07		0.71	0.0538± 0.0034	0.2954± 0.0181	0.0396± 0.0007	364.87± 144.4280	262.81± 14.0484	250.68± 4.2119	95
ZLG-22-20	2.4374	227.64		102.24		0.45	0.0547± 0.0067	0.2916± 0.0303	0.0401± 0.0010	466.71± 275.8900	259.82± 23.4196	253.60± 6.3016	97
ZLG-22-22	0.6650	346.50		178.91		0.52	0.0506± 0.0045	0.2891± 0.0262	0.0408± 0.0009	220.44± 196.2750	257.88± 20.1280	258.22± 5.7015	99
ZLG-22-23	0.2382	379.90		132.01		0.35	0.0524± 0.0045	0.2805± 0.0211	0.0400± 0.0010	305.62± 202.7530	251.13± 16.3184	253.34± 6.2258	99
ZLG-22-25	0.6496	362.72		146.31		0.40	0.0539± 0.0044	0.2887± 0.0215	0.0399± 0.0009	368.57± 183.3100	257.58± 16.2335	252.39± 5.5236	97
ZLG-22-26	1.5691	376.49		212.50		0.56	0.0507± 0.0046	0.2911± 0.0251	0.0413± 0.0008	227.85± 16.6650	259.49± 19.3279	261.40± 4.9738	99
ZLG-22-27	1.9669	414.77		176.72		0.43	0.0521± 0.0034	0.2937± 0.0195	0.0410± 0.0008	300.06± 115.7280	261.48± 14.8045	259.13± 4.9481	99

样品号	T (Ma)	Rb (10^-6)	Sr (10^-6)	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr	(⁸⁷Sr/ ⁸⁶Sr)_i	Sm (10^-6)	Nd (10^-6)	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd	(¹⁴³Nd/ ¹⁴⁴Nd)_i	ε_Nd(t)	T_DM (Ga)
ZLG-6-1	255	133.216	238.080	1.667	0.708	0.702	2.664	13.951	0.115	0.51264	0.51241	3.3	0.74
ZLG-6-2	255	204.320	62.400	9.760	0.706	0.670	1.592	6.902	0.139	0.51268	0.51248	2.5	0.98
ZLG-6-3	255	157.760	258.080	1.822	0.708	0.701	2.534	13.062	0.117	0.51267	0.51244	3.2	0.77
ZLG-26-1	255	328.800	48.880	20.052	0.745	0.672	1.198	5.040	0.143	0.51267	0.51248	-0.6	1.37
ZLG-26-2	255	123.840	216.800	1.702	0.707	0.701	2.994	15.673	0.115	0.51265	0.51246	3.0	0.76
ZLG-64	255	105.616	78.304	4.020	0.705	0.691	5.273	23.640	0.134	0.51266	0.51247	2.1	0.98
ZLG-65	255	210.450	84.244	7.446	0.707	0.680	4.178	20.474	0.123	0.51252	0.51228	3.3	0.78