Petrogenesis of the Guluo and Wangjiangchong Shoshonite-gabbro in Southeastern Guangxi Province: Constraints from Petrochemistry, Zircon U-Pb Age and Hf Isotope

doi:10.19657/j.geoscience.1000-8527.2019.032

Abstract

Abstract:

The Guluo and Wangjiangchong plutons are located in the southwestern section of the suture between the Yangtze and Cathaysia blocks. They are important in revealing the tectonic evolution of South China. The plutons are composed dominantly of gabbro with minor diorite. The zircon U-Pb ages of the Guluo and Wangjiangchong plutons are (163 ± 1) Ma and (158 ± 1) Ma, respectively. The rocks show no negative Nb-Ta anomalies and intraplate potassic basalt affinity. The zircon ε_Hf(t) values (0.7-8.3) and T_DM2 (672-1,168 Ma) are indicative of a Neoproterozoic lithospheric mantle source. Integrating the regional geology, whole-rock geochemistry and zircon Hf isotopes studies, we suggest that the Guluo and Wangjiangchong plutons were formed in an intraplate extensional setting, via mixing between materials from the depleted asthenospheric mantle and the enriched lithospheric mantle, and contaminated by crustal materials during the magma ascent.

Key words: Yanshanian, southeast of Guangxi, Guluo pluton, Wangjiangchong pluton, shoshonite, gabbro

CLC Number:

NONG Junnian, GUO Shangyu, SUN Minghang, TANG Juanhong, QIN Ruicai, ZHOU Qiue. Petrogenesis of the Guluo and Wangjiangchong Shoshonite-gabbro in Southeastern Guangxi Province: Constraints from Petrochemistry, Zircon U-Pb Age and Hf Isotope[J]. Geoscience, 2020, 34(05): 1001-1014.

Figures/Tables 12

Fig.1 Regional geotectonic location map (a), schematic regional tectonic map (b), and geologic map of the Guluo area (c)

Fig.2 Outcrop and thin-section microscopic photographs of the Guluo gabbro

Table 1 LA-ICP-MS zircon U-Pb data of the Guluo and Wangjiangchong gabbros

测点编号		w_B/10^-6			Th/U	同位素比值				年龄/Ma
测点编号		Th	U	Pb	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb^/238U±1σ		²⁰⁷Pb/²⁰⁶Pb ±1σ		²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb^/238U ±1σ
GL-1 (古罗岩体)	1	391	330	39	1.19	0.048 93±0.001 39	0.174 53±0.004 65	0.025 87±0.000 21	144±47		163±4		165±1
	2	302	255	32	1.19	0.048 83±0.004 19	0.186 24±0.015 75	0.027 66±0.000 39	140±163		173±13		176±2
	3	340	417	48	0.82	0.048 81±0.001 43	0.173 98±0.004 80	0.025 85±0.000 21	139±49		163±4		165±1
	4	268	220	26	1.22	0.049 06±0.002 78	0.175 13±0.009 70	0.025 89±0.000 28	151±106		164±8		165±2
	5	631	524	63	1.21	0.049 50±0.001 90	0.176 35±0.006 51	0.025 84±0.000 24	172±69		165±6		164±2
	6	1 028	761	92	1.35	0.048 96±0.001 02	0.174 58±0.003 27	0.025 86±0.000 18	146±31		163±3		165±1
	7	1 004	659	77	1.52	0.050 31±0.002 58	0.174 69±0.008 73	0.025 18±0.000 27	209±96		163±8		160±2
	8	116	154	17	0.75	0.050 60±0.004 06	0.177 25±0.013 92	0.025 41±0.000 42	223±147		166±12		162±3
	9	560	465	55	1.20	0.049 16±0.001 34	0.173 67±0.004 44	0.025 62±0.000 20	155±45		163±4		163±1
	10	352	344	40	1.02	0.050 13±0.001 41	0.177 66±0.004 69	0.025 71±0.000 20	201±47		166±4		164±1
	11	1 067	691	82	1.55	0.049 08±0.001 17	0.171 59±0.003 77	0.025 36±0.000 19	152±37		161±3		161±1
	12	752	516	63	1.46	0.049 96±0.001 30	0.176 85±0.004 29	0.025 67±0.000 20	193±42		165±4		163±1
	13	331	381	43	0.87	0.049 83±0.002 54	0.174 85±0.008 68	0.025 45±0.000 26	187±96		164±8		162±2
	14	1 069	921	107	1.16	0.049 04±0.001 02	0.172 35±0.003 22	0.025 49±0.000 18	150±30		161±3		162±1
	15	375	298	36	1.26	0.048 97±0.002 80	0.173 81±0.009 74	0.025 74±0.000 28	146±107		163±8		164±2
	16	448	298	35	1.50	0.050 10±0.003 89	0.175 05±0.013 31	0.025 35±0.000 38	200±144		164±12		161±2
	17	194	261	31	0.74	0.049 44±0.002 43	0.180 53±0.008 61	0.026 49±0.000 30	169±90		169±7		169±2
	18	804	594	72	1.35	0.050 15±0.001 68	0.177 18±0.005 68	0.025 63±0.000 22	202±58		166±5		163±1
	19	59	87	10	0.68	0.052 44±0.129 43	0.182 72±0.449 77	0.025 28±0.004 79	305±2 844		170±386		161±30
	20	836	624	76	1.34	0.048 59±0.001 14	0.172 27±0.003 74	0.025 72±0.000 19	128±37		161±3		164±1
	21	515	453	55	1.14	0.049 49±0.001 41	0.177 16±0.004 76	0.025 97±0.000 20	171±48		166±4		165±1
	22	955	798	97	1.20	0.048 90±0.000 93	0.174 92±0.002 95	0.025 95±0.000 18	143±27		164±3		165±1
	23	1 188	670	83	1.77	0.049 31±0.002 15	0.172 27±0.007 30	0.025 34±0.000 24	163±81		161±6		161±2
	24	535	548	65	0.98	0.050 08±0.001 58	0.175 78±0.005 30	0.025 46±0.000 20	199±55		164±5		162±1
	25	1 158	741	89	1.56	0.050 30±0.002 61	0.175 97±0.008 90	0.025 38±0.000 27	209±98		165±8		162±2
	26	214	233	28	0.92	0.048 59±0.002 04	0.174 18±0.007 06	0.026 01±0.000 25	128±76		163±6		166±2
	27	246	328	38	0.75	0.049 92±0.001 36	0.177 17±0.004 53	0.025 75±0.000 21	191±44		166±4		164±1
	28	324	329	40	0.99	0.048 86±0.001 25	0.175 47±0.004 18	0.026 05±0.000 20	141±41		164±4		166±1
	29	626	554	67	1.13	0.048 81±0.001 07	0.173 51±0.003 48	0.025 79±0.000 18	139±34		162±3		164±1
	30	625	454	56	1.38	0.048 95±0.001 39	0.175 75±0.004 72	0.026 05±0.000 22	145±47		164±4		166±1
WJC-2 (王姜冲岩体)	1	658	468	45	0.71	0.048 70±0.001 10	0.166 15±0.003 46	0.024 76±0.000 18	133±35		156±3		158±1
	2	286	275	28	0.96	0.048 51±0.002 87	0.170 88±0.009 89	0.025 56±0.000 31	124±107		160±9		163±2
	3	961	533	51	0.55	0.050 03±0.001 10	0.169 09±0.003 39	0.024 53±0.000 18	196±33		159±3		156±1
	4	1 482	927	89	0.63	0.050 04±0.000 93	0.169 00±0.002 79	0.024 51±0.000 17	197±25		159±2		156±1
	5	1 338	783	76	0.58	0.048 56±0.001 02	0.165 08±0.003 14	0.024 67±0.000 17	127±32		155±3		157±1
	6	273	228	22	0.83	0.048 46±0.002 48	0.168 43±0.008 40	0.025 22±0.000 26	122±93		158±7		161±2
	7	1 117	680	66	0.61	0.049 76±0.001 10	0.171 53±0.003 45	0.025 01±0.000 18	184±33		161±3		159±1
	8	297	331	32	1.11	0.049 24±0.002 06	0.168 30±0.006 80	0.024 79±0.000 25	159±75		158±6		158±2
	9	245	220	21	0.90	0.049 16±0.003 44	0.166 86±0.011 44	0.024 63±0.000 34	155±129		157±10		157±2
	10	961	624	60	0.65	0.049 21±0.001 13	0.167 64±0.003 52	0.024 71±0.000 18	158±35		157±3		157±1
	11	959	524	50	0.55	0.049 91±0.001 26	0.168 86±0.003 97	0.024 54±0.000 19	191±40		158±3		156±1
	12	279	211	20	0.76	0.049 09±0.001 63	0.167 44±0.005 31	0.024 74±0.000 21	152±58		157±5		158±1
	13	270	238	23	0.88	0.049 55±0.003 07	0.171 22±0.010 38	0.025 07±0.000 30	174±116		160±9		160±2
测点编号		w_B/10^-6			Th/U	同位素比值				年龄/Ma
测点编号		Th	U	Pb	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb^/238U±1σ		²⁰⁷Pb/²⁰⁶Pb ±1σ		²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb^/238U ±1σ
WJC-2 (王姜冲岩体)	14	1 378	785	76	0.57	0.049 43±0.001 34	0.169 32±0.004 29	0.024 85±0.000 20	168±44			159±4		158±1
	16	313	286	28	0.91	0.049 28±0.002 67	0.171 07±0.008 98	0.025 18±0.000 31	161±97			160±8		160±2
	17	967	738	71	0.76	0.048 87±0.000 97	0.166 49±0.002 96	0.024 71±0.000 17	142±29			156±3		157±1
	18	1 695	1 095	106	0.65	0.049 43±0.000 83	0.170 12±0.002 45	0.024 96±0.000 16	168±22			160±2		159±1
	19	163	300	29	1.83	0.048 87±0.003 67	0.170 76±0.012 55	0.025 34±0.000 38	142±137			160±11		161±2
	20	517	508	52	0.98	0.051 21±0.006 10	0.184 67±0.021 59	0.026 15±0.000 62	250±220			172±19		166±4
	21	352	347	33	0.99	0.049 72±0.002 00	0.169 44±0.006 56	0.024 71±0.000 25	182±71			159±6		157±2
	22	322	328	32	1.02	0.049 82±0.002 17	0.172 48±0.007 24	0.025 11±0.000 27	187±78			162±6		160±2
	23	265	293	30	1.11	0.048 81±0.003 22	0.176 61±0.011 41	0.026 24±0.000 32	139±123			165±10		167±2
	24	240	283	28	1.18	0.049 49±0.003 92	0.172 08±0.013 35	0.025 22±0.000 39	171±146			161±12		161±2
	25	459	422	41	0.92	0.049 66±0.001 62	0.171 32±0.005 35	0.025 02±0.000 20	179±58			161±5		159±1
	26	353	306	30	0.87	0.049 23±0.001 34	0.172 39±0.004 40	0.025 40±0.000 20	159±45			161±4		162±1
	27	891	653	63	0.73	0.049 38±0.000 96	0.169 29±0.002 92	0.024 86±0.000 17	166±27			159±3		158±1
	28	605	440	41	0.73	0.049 93±0.001 19	0.168 65±0.003 07	0.024 50±0.000 18	192±37			158±3		156±1
	29	222	234	23	1.05	0.049 52±0.002 89	0.172 50±0.009 78	0.025 26±0.000 33	173±105			162±8		161±2
	30	441	468	45	1.06	0.049 13±0.001 10	0.169 53±0.003 45	0.025 03±0.000 18	154±34			159±3		159±1

Table 1 LA-ICP-MS zircon U-Pb data of the Guluo and Wangjiangchong gabbros

测点编号		w_B/10^-6			Th/U	同位素比值				年龄/Ma
测点编号		Th	U	Pb	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb^/238U±1σ		²⁰⁷Pb/²⁰⁶Pb ±1σ		²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb^/238U ±1σ
GL-1 (古罗岩体)	1	391	330	39	1.19	0.048 93±0.001 39	0.174 53±0.004 65	0.025 87±0.000 21	144±47		163±4		165±1
	2	302	255	32	1.19	0.048 83±0.004 19	0.186 24±0.015 75	0.027 66±0.000 39	140±163		173±13		176±2
	3	340	417	48	0.82	0.048 81±0.001 43	0.173 98±0.004 80	0.025 85±0.000 21	139±49		163±4		165±1
	4	268	220	26	1.22	0.049 06±0.002 78	0.175 13±0.009 70	0.025 89±0.000 28	151±106		164±8		165±2
	5	631	524	63	1.21	0.049 50±0.001 90	0.176 35±0.006 51	0.025 84±0.000 24	172±69		165±6		164±2
	6	1 028	761	92	1.35	0.048 96±0.001 02	0.174 58±0.003 27	0.025 86±0.000 18	146±31		163±3		165±1
	7	1 004	659	77	1.52	0.050 31±0.002 58	0.174 69±0.008 73	0.025 18±0.000 27	209±96		163±8		160±2
	8	116	154	17	0.75	0.050 60±0.004 06	0.177 25±0.013 92	0.025 41±0.000 42	223±147		166±12		162±3
	9	560	465	55	1.20	0.049 16±0.001 34	0.173 67±0.004 44	0.025 62±0.000 20	155±45		163±4		163±1
	10	352	344	40	1.02	0.050 13±0.001 41	0.177 66±0.004 69	0.025 71±0.000 20	201±47		166±4		164±1
	11	1 067	691	82	1.55	0.049 08±0.001 17	0.171 59±0.003 77	0.025 36±0.000 19	152±37		161±3		161±1
	12	752	516	63	1.46	0.049 96±0.001 30	0.176 85±0.004 29	0.025 67±0.000 20	193±42		165±4		163±1
	13	331	381	43	0.87	0.049 83±0.002 54	0.174 85±0.008 68	0.025 45±0.000 26	187±96		164±8		162±2
	14	1 069	921	107	1.16	0.049 04±0.001 02	0.172 35±0.003 22	0.025 49±0.000 18	150±30		161±3		162±1
	15	375	298	36	1.26	0.048 97±0.002 80	0.173 81±0.009 74	0.025 74±0.000 28	146±107		163±8		164±2
	16	448	298	35	1.50	0.050 10±0.003 89	0.175 05±0.013 31	0.025 35±0.000 38	200±144		164±12		161±2
	17	194	261	31	0.74	0.049 44±0.002 43	0.180 53±0.008 61	0.026 49±0.000 30	169±90		169±7		169±2
	18	804	594	72	1.35	0.050 15±0.001 68	0.177 18±0.005 68	0.025 63±0.000 22	202±58		166±5		163±1
	19	59	87	10	0.68	0.052 44±0.129 43	0.182 72±0.449 77	0.025 28±0.004 79	305±2 844		170±386		161±30
	20	836	624	76	1.34	0.048 59±0.001 14	0.172 27±0.003 74	0.025 72±0.000 19	128±37		161±3		164±1
	21	515	453	55	1.14	0.049 49±0.001 41	0.177 16±0.004 76	0.025 97±0.000 20	171±48		166±4		165±1
	22	955	798	97	1.20	0.048 90±0.000 93	0.174 92±0.002 95	0.025 95±0.000 18	143±27		164±3		165±1
	23	1 188	670	83	1.77	0.049 31±0.002 15	0.172 27±0.007 30	0.025 34±0.000 24	163±81		161±6		161±2
	24	535	548	65	0.98	0.050 08±0.001 58	0.175 78±0.005 30	0.025 46±0.000 20	199±55		164±5		162±1
	25	1 158	741	89	1.56	0.050 30±0.002 61	0.175 97±0.008 90	0.025 38±0.000 27	209±98		165±8		162±2
	26	214	233	28	0.92	0.048 59±0.002 04	0.174 18±0.007 06	0.026 01±0.000 25	128±76		163±6		166±2
	27	246	328	38	0.75	0.049 92±0.001 36	0.177 17±0.004 53	0.025 75±0.000 21	191±44		166±4		164±1
	28	324	329	40	0.99	0.048 86±0.001 25	0.175 47±0.004 18	0.026 05±0.000 20	141±41		164±4		166±1
	29	626	554	67	1.13	0.048 81±0.001 07	0.173 51±0.003 48	0.025 79±0.000 18	139±34		162±3		164±1
	30	625	454	56	1.38	0.048 95±0.001 39	0.175 75±0.004 72	0.026 05±0.000 22	145±47		164±4		166±1
WJC-2 (王姜冲岩体)	1	658	468	45	0.71	0.048 70±0.001 10	0.166 15±0.003 46	0.024 76±0.000 18	133±35		156±3		158±1
	2	286	275	28	0.96	0.048 51±0.002 87	0.170 88±0.009 89	0.025 56±0.000 31	124±107		160±9		163±2
	3	961	533	51	0.55	0.050 03±0.001 10	0.169 09±0.003 39	0.024 53±0.000 18	196±33		159±3		156±1
	4	1 482	927	89	0.63	0.050 04±0.000 93	0.169 00±0.002 79	0.024 51±0.000 17	197±25		159±2		156±1
	5	1 338	783	76	0.58	0.048 56±0.001 02	0.165 08±0.003 14	0.024 67±0.000 17	127±32		155±3		157±1
	6	273	228	22	0.83	0.048 46±0.002 48	0.168 43±0.008 40	0.025 22±0.000 26	122±93		158±7		161±2
	7	1 117	680	66	0.61	0.049 76±0.001 10	0.171 53±0.003 45	0.025 01±0.000 18	184±33		161±3		159±1
	8	297	331	32	1.11	0.049 24±0.002 06	0.168 30±0.006 80	0.024 79±0.000 25	159±75		158±6		158±2
	9	245	220	21	0.90	0.049 16±0.003 44	0.166 86±0.011 44	0.024 63±0.000 34	155±129		157±10		157±2
	10	961	624	60	0.65	0.049 21±0.001 13	0.167 64±0.003 52	0.024 71±0.000 18	158±35		157±3		157±1
	11	959	524	50	0.55	0.049 91±0.001 26	0.168 86±0.003 97	0.024 54±0.000 19	191±40		158±3		156±1
	12	279	211	20	0.76	0.049 09±0.001 63	0.167 44±0.005 31	0.024 74±0.000 21	152±58		157±5		158±1
	13	270	238	23	0.88	0.049 55±0.003 07	0.171 22±0.010 38	0.025 07±0.000 30	174±116		160±9		160±2
测点编号		w_B/10^-6			Th/U	同位素比值				年龄/Ma
测点编号		Th	U	Pb	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb^/238U±1σ		²⁰⁷Pb/²⁰⁶Pb ±1σ		²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb^/238U ±1σ
WJC-2 (王姜冲岩体)	14	1 378	785	76	0.57	0.049 43±0.001 34	0.169 32±0.004 29	0.024 85±0.000 20	168±44			159±4		158±1
	16	313	286	28	0.91	0.049 28±0.002 67	0.171 07±0.008 98	0.025 18±0.000 31	161±97			160±8		160±2
	17	967	738	71	0.76	0.048 87±0.000 97	0.166 49±0.002 96	0.024 71±0.000 17	142±29			156±3		157±1
	18	1 695	1 095	106	0.65	0.049 43±0.000 83	0.170 12±0.002 45	0.024 96±0.000 16	168±22			160±2		159±1
	19	163	300	29	1.83	0.048 87±0.003 67	0.170 76±0.012 55	0.025 34±0.000 38	142±137			160±11		161±2
	20	517	508	52	0.98	0.051 21±0.006 10	0.184 67±0.021 59	0.026 15±0.000 62	250±220			172±19		166±4
	21	352	347	33	0.99	0.049 72±0.002 00	0.169 44±0.006 56	0.024 71±0.000 25	182±71			159±6		157±2
	22	322	328	32	1.02	0.049 82±0.002 17	0.172 48±0.007 24	0.025 11±0.000 27	187±78			162±6		160±2
	23	265	293	30	1.11	0.048 81±0.003 22	0.176 61±0.011 41	0.026 24±0.000 32	139±123			165±10		167±2
	24	240	283	28	1.18	0.049 49±0.003 92	0.172 08±0.013 35	0.025 22±0.000 39	171±146			161±12		161±2
	25	459	422	41	0.92	0.049 66±0.001 62	0.171 32±0.005 35	0.025 02±0.000 20	179±58			161±5		159±1
	26	353	306	30	0.87	0.049 23±0.001 34	0.172 39±0.004 40	0.025 40±0.000 20	159±45			161±4		162±1
	27	891	653	63	0.73	0.049 38±0.000 96	0.169 29±0.002 92	0.024 86±0.000 17	166±27			159±3		158±1
	28	605	440	41	0.73	0.049 93±0.001 19	0.168 65±0.003 07	0.024 50±0.000 18	192±37			158±3		156±1
	29	222	234	23	1.05	0.049 52±0.002 89	0.172 50±0.009 78	0.025 26±0.000 33	173±105			162±8		161±2
	30	441	468	45	1.06	0.049 13±0.001 10	0.169 53±0.003 45	0.025 03±0.000 18	154±34			159±3		159±1

Fig.3 Representative zircon CL images of the Guluo (a) and Wangjiangchong (b) gabbros

Fig.4 Concordia diagrams showing LA-ICP-MS zircon U-Pb age dating results of samples from Guluo(a) and Wangjiangchong(b)gabbros

Table 2 Major (%), trace element (10-6) and REE (10-6) contents of the Guluo and Wangjiangchong gabbro samples

样品编号	SiO₂		Al₂O₃		Fe₂O₃		FeO		CaO		MgO		Na₂O		K₂O		TiO₂		MnO			P₂O₅			SrO			BaO		烧失量		总量
GL-1	40.60		10.80		19.68		—		10.05		9.42		2.00		1.41		3.65		0.23			0.35			0.07			0.01		1.69		101.39
GL-2	47.56		15.95		4.72		8.13		6.91		5.67		2.70		2.04		2.28		0.18			1.02			—			—		2.42		99.58
GL-3	46.86		20.15		3.18		7.15		8.50		2.26		3.54		1.72		1.84		0.16			1.13			—			—		3.21		99.70
WJC-1	46.90		15.25		13.36		—		8.78		5.49		2.98		1.78		2.60		0.21			0.81			0.07			0.01		1.67		101.13
WJC-3	45.86		16.17		3.12		10.87		7.90		4.55		2.73		2.05		2.51		0.17			0.88			—			—		2.42		99.23
样品编号	A/CNK		K/Na		ALK		Mg^#		Li		Be		Sc		V		Cr		Co			Ni			Cu			Zn		Ga		Rb
GL-1	0.47		0.71		3.41		48.92		6.10		1.02		51.8		602		66.0		74.6			55.9			140.5			143		20.6		34.1
GL-2	0.83		0.76		4.74		55.66		17.90		1.95		34.3		339		41.4		39.1			14.9			36.5			111		26.5		99.6
GL-3	0.87		0.49		5.26		36.26		12.20		2.04		11.6		257		37.0		26.1			11.6			86.3			87		26.6		78.8
WJC-1	0.67		0.60		4.76		45.12		7.50		1.47		28.6		281		31.0		38.5			21.0			131.5			117		23.4		58.1
WJC-3	0.77		0.75		4.78		42.97		13.80		1.77		25.3		424		110.0		55.4			38.2			172.4			123		27.8		74.9
样品编号	Sr	Zr		Nb		Cs		Ba		Hf		Ta		Pb		Th		U		La			Ce			Pr			Nd		Sm			Eu
GL-1	518	90.7		43.6		0.94		420		3.40		2.66		3.30		3.20		0.70		35.0			79.2			10.5			42.4		8.35			2.81
GL-2	703	192.0		41.7		—		857		5.36		3.23		6.81		6.83		1.44		51.4			104.0			13.5			55.1		11.00			3.05
GL-3	1 034	201.0		36.5		—		527		8.62		2.37		12.20		6.51		1.50		49.7			97.7			12.8			51.6		9.00			2.47
WJC-1	985	87.8		59.1		3.15		580		3.70		3.19		5.00		5.50		1.20		61.9			133.5			17.2			67.2		12.25			3.85
WJC-3	862	267.0		46.5		—		793		6.78		3.35		6.26		6.27		1.67		51.4			101.0			12.2			47.5		8.83			2.50
样品编号	Gd	Tb		Dy		Ho		Er		Tm		Yb		Lu		Y		ΣREE			LREE			L/H			(La/Yb)_N			δEu			δCe
GL-1	8.22	1.18		6.39		1.24		3.39		0.41		2.52		0.36		33.1		201.97			178.26			7.52			9.96			1.02			1.00
GL-2	10.16	1.38		7.56		1.41		3.89		0.54		3.31		0.48		37.4		266.78			238.05			8.29			11.14			0.87			0.95
GL-3	7.72	1.06		5.82		1.04		2.80		0.38		2.38		0.34		27.4		244.81			223.27			10.37			14.98			0.88			0.93
WJC-1	11.00	1.58		8.40		1.61		4.47		0.56		3.44		0.50		45.7		327.46			295.90			9.38			12.91			0.99			0.99
WJC-3	7.88	1.03		5.69		1.05		2.83		0.40		2.47		0.37		27.6		245.15			223.43			10.29			14.93			0.90			0.96

Table 2 Major (%), trace element (10-6) and REE (10-6) contents of the Guluo and Wangjiangchong gabbro samples

样品编号	SiO₂		Al₂O₃		Fe₂O₃		FeO		CaO		MgO		Na₂O		K₂O		TiO₂		MnO			P₂O₅			SrO			BaO		烧失量		总量
GL-1	40.60		10.80		19.68		—		10.05		9.42		2.00		1.41		3.65		0.23			0.35			0.07			0.01		1.69		101.39
GL-2	47.56		15.95		4.72		8.13		6.91		5.67		2.70		2.04		2.28		0.18			1.02			—			—		2.42		99.58
GL-3	46.86		20.15		3.18		7.15		8.50		2.26		3.54		1.72		1.84		0.16			1.13			—			—		3.21		99.70
WJC-1	46.90		15.25		13.36		—		8.78		5.49		2.98		1.78		2.60		0.21			0.81			0.07			0.01		1.67		101.13
WJC-3	45.86		16.17		3.12		10.87		7.90		4.55		2.73		2.05		2.51		0.17			0.88			—			—		2.42		99.23
样品编号	A/CNK		K/Na		ALK		Mg^#		Li		Be		Sc		V		Cr		Co			Ni			Cu			Zn		Ga		Rb
GL-1	0.47		0.71		3.41		48.92		6.10		1.02		51.8		602		66.0		74.6			55.9			140.5			143		20.6		34.1
GL-2	0.83		0.76		4.74		55.66		17.90		1.95		34.3		339		41.4		39.1			14.9			36.5			111		26.5		99.6
GL-3	0.87		0.49		5.26		36.26		12.20		2.04		11.6		257		37.0		26.1			11.6			86.3			87		26.6		78.8
WJC-1	0.67		0.60		4.76		45.12		7.50		1.47		28.6		281		31.0		38.5			21.0			131.5			117		23.4		58.1
WJC-3	0.77		0.75		4.78		42.97		13.80		1.77		25.3		424		110.0		55.4			38.2			172.4			123		27.8		74.9
样品编号	Sr	Zr		Nb		Cs		Ba		Hf		Ta		Pb		Th		U		La			Ce			Pr			Nd		Sm			Eu
GL-1	518	90.7		43.6		0.94		420		3.40		2.66		3.30		3.20		0.70		35.0			79.2			10.5			42.4		8.35			2.81
GL-2	703	192.0		41.7		—		857		5.36		3.23		6.81		6.83		1.44		51.4			104.0			13.5			55.1		11.00			3.05
GL-3	1 034	201.0		36.5		—		527		8.62		2.37		12.20		6.51		1.50		49.7			97.7			12.8			51.6		9.00			2.47
WJC-1	985	87.8		59.1		3.15		580		3.70		3.19		5.00		5.50		1.20		61.9			133.5			17.2			67.2		12.25			3.85
WJC-3	862	267.0		46.5		—		793		6.78		3.35		6.26		6.27		1.67		51.4			101.0			12.2			47.5		8.83			2.50
样品编号	Gd	Tb		Dy		Ho		Er		Tm		Yb		Lu		Y		ΣREE			LREE			L/H			(La/Yb)_N			δEu			δCe
GL-1	8.22	1.18		6.39		1.24		3.39		0.41		2.52		0.36		33.1		201.97			178.26			7.52			9.96			1.02			1.00
GL-2	10.16	1.38		7.56		1.41		3.89		0.54		3.31		0.48		37.4		266.78			238.05			8.29			11.14			0.87			0.95
GL-3	7.72	1.06		5.82		1.04		2.80		0.38		2.38		0.34		27.4		244.81			223.27			10.37			14.98			0.88			0.93
WJC-1	11.00	1.58		8.40		1.61		4.47		0.56		3.44		0.50		45.7		327.46			295.90			9.38			12.91			0.99			0.99
WJC-3	7.88	1.03		5.69		1.05		2.83		0.40		2.47		0.37		27.6		245.15			223.43			10.29			14.93			0.90			0.96

Fig.5 SiO2-(K2O+ Na2O) ((a),base map after reference [28]) and SiO2-K2O diagrams for the gabbro samples ((b),base map after references [29-30])

Fig.6 Chondrite-normalized REE patterns ((a),base map after reference [31]) and primitive-mantle-normalized multi-element spidergram for gabbro samples ((b),base map after reference[31])

Table 3 LA-MC-ICP-MS zircon Lu-Hf isotope data of gabbro samples from the Guluo and Wangjiangchong

样品及分析点号		年龄/Ma	¹⁷⁶Yb/ ¹⁷⁷Hf	¹⁷⁶Lu/ ¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf±2σ	T_DM /Ma	$T D M 2$ /Ma	ε_Hf(0)	ε_Hf(t)	$f Lu / Hf$
GL-1 (古罗岩体)	1	165	0.090 269	0.001 619	0.282 756±0.000 027	714	1 028	-0.55	2.9	-0.96
	2	176	0.076 848	0.001 362	0.282 822±0.000 030	615	871	1.77	5.5	-0.95
	3	165	0.093 650	0.001 705	0.282 830±0.000 026	609	862	2.05	5.5	-0.98
	4	165	0.030 093	0.000 560	0.282 723±0.000 027	741	1 097	-1.74	1.8	-0.96
	5	164	0.071 446	0.001 235	0.282 817±0.000 025	620	889	1.59	5.1	-0.93
	6	165	0.132 881	0.002 177	0.282 841±0.000 030	601	840	2.44	5.8	-0.95
	7	160	0.094 543	0.001 611	0.282 837±0.000 023	597	848	2.31	5.7	-0.96
	8	162	0.079 647	0.001 325	0.282 821±0.000 026	617	882	1.72	5.1	-0.97
	9	163	0.060 721	0.001 059	0.282 693±0.000 026	793	1 168	-2.78	0.7	-0.95
	10	164	0.089 598	0.001 512	0.282 762±0.000 027	704	1 015	-0.36	3.1	-0.93
	11	161	0.135 710	0.002 228	0.282 873±0.000 028	556	771	3.56	6.9	-0.95
	12	163	0.098 089	0.001 644	0.282 773±0.000 024	691	993	0.02	3.4	-0.96
	13	162	0.072 985	0.001 324	0.282 746±0.000 022	723	1 050	-0.91	2.5	-0.94
	15	164	0.110 921	0.001 891	0.282 841±0.000 026	597	840	2.42	5.8	-0.95
	16	161	0.090 756	0.001 517	0.282 769±0.000 027	694	1 001	-0.11	3.3	-0.97
	17	169	0.058 462	0.001 007	0.282 751±0.000 026	710	1 034	-0.75	2.9	-0.94
	18	163	0.108 347	0.001 835	0.282 893±0.000 027	521	722	4.27	7.7	-0.96
	20	164	0.070 769	0.001 247	0.282 795±0.000 025	651	938	0.83	4.3	-0.94
	21	165	0.114 290	0.001 901	0.282 836±0.000 024	604	850	2.27	5.7	-0.95
	22	165	0.093 102	0.001 675	0.282 774±0.000 023	690	989	0.07	3.5	-0.94
	23	161	0.121 754	0.002 080	0.282 777±0.000 029	693	987	0.18	3.5	-0.93
	24	162	0.135 761	0.002 356	0.282 886±0.000 026	538	741	4.04	7.3	-0.94
	25	162	0.106 936	0.001 850	0.282 757±0.000 029	718	1 031	-0.55	2.8	-0.98
	26	166	0.034 608	0.000 645	0.282 742±0.000 022	717	1 054	-1.08	2.5	-0.97
	27	164	0.048 099	0.000 851	0.282 717±0.000 026	755	1 113	-1.96	1.6	-0.96
	28	166	0.079 346	0.001 421	0.282 824±0.000 024	613	872	1.85	5.3	-0.96
	29	164	0.079 920	0.001 368	0.282 821±0.000 023	618	882	1.72	5.2	-0.94
	30	166	0.122 002	0.002 123	0.282 821±0.000 027	629	884	1.74	5.2	-0.96
WJC-2 (王姜冲岩体)	1	158	0.122 478	0.002 081	0.282 863±0.000 028	568	794	3.21	6.5	-0.94
	2	163	0.060 987	0.001 095	0.282 767±0.000 027	689	1 001	-0.17	3.3	-0.97
	3	156	0.062 784	0.001 091	0.282 756±0.000 028	704	1 030	-0.56	2.8	-0.97
	4	156	0.182 452	0.003 059	0.282 920±0.000 030	498	672	5.23	8.3	-0.91
	5	157	0.072 200	0.001 255	0.282 796±0.000 028	651	941	0.85	4.2	-0.96
	6	161	0.057 827	0.000 992	0.282 750±0.000 026	711	1 040	-0.77	2.7	-0.97
	7	159	0.078 144	0.001 339	0.282 747±0.000 022	722	1 050	-0.88	2.5	-0.96
	8	158	0.120 985	0.002 093	0.282 705±0.000 030	798	1 150	-2.36	0.9	-0.94
	9	157	0.097 548	0.001 693	0.282 765±0.000 026	703	1 013	-0.23	3.0	-0.95
	10	157	0.096 685	0.001 687	0.282 779±0.000 025	683	982	0.24	3.5	-0.95
	11	156	0.123 280	0.002 153	0.282 797±0.000 028	665	944	0.90	4.1	-0.94
	12	158	0.180 122	0.002 940	0.282 838±0.000 029	618	855	2.35	5.5	-0.91
	13	160	0.094 577	0.001 638	0.282 774±0.000 023	688	990	0.09	3.4	-0.95
	14	158	0.161 252	0.002 711	0.282 810±0.000 030	656	918	1.35	4.5	-0.92
	16	160	0.070 054	0.001 240	0.282 789±0.000 025	661	955	0.60	4.0	-0.96
	17	157	0.091 408	0.001 603	0.282 786±0.000 026	671	965	0.50	3.8	-0.95
样品及分析点号		年龄/Ma	¹⁷⁶Yb/ ¹⁷⁷Hf	¹⁷⁶Lu/ ¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf±2σ	T_DM /Ma	$T D M 2$ /Ma	ε_Hf(0)	ε_Hf(t)	$f Lu / Hf$
WJC-2 (王姜冲岩体)	18	159	0.085 027	0.001 567	0.282 782±0.000 027	676	973	0.35	3.7	-0.95
	19	161	0.093 584	0.001 698	0.282 809±0.000 030	640	912	1.31	4.7	-0.95
	20	166	0.093 402	0.001 684	0.282 729±0.000 025	755	1 090	-1.52	1.9	-0.95
	21	157	0.059 336	0.001 064	0.282 810±0.000 023	628	908	1.34	4.7	-0.97
	22	160	0.102 317	0.001 782	0.282 715±0.000 028	777	1 125	-2.01	1.3	-0.95
	23	167	0.043 941	0.000 816	0.282 694±0.000 027	787	1 163	-2.77	0.8	-0.98
	24	161	0.126 266	0.002 223	0.282 853±0.000 029	585	817	2.85	6.2	-0.93
	25	159	0.089 278	0.001 601	0.282 788±0.000 024	668	960	0.56	3.9	-0.95
	26	162	0.091 475	0.001 675	0.282 766±0.000 027	701	1 008	-0.20	3.2	-0.95
	27	158	0.128 285	0.002 316	0.282 805±0.000 025	657	928	1.15	4.4	-0.93
	28	156	0.079 977	0.001 469	0.282 719±0.000 026	765	1 117	-1.88	1.4	-0.96
	29	161	0.135 838	0.002 402	0.282 823±0.000 028	631	884	1.82	5.1	-0.93
	30	159	0.128 861	0.002 305	0.282 749±0.000 030	738	1 053	-0.82	2.4	-0.93

Table 3 LA-MC-ICP-MS zircon Lu-Hf isotope data of gabbro samples from the Guluo and Wangjiangchong

样品及分析点号		年龄/Ma	¹⁷⁶Yb/ ¹⁷⁷Hf	¹⁷⁶Lu/ ¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf±2σ	T_DM /Ma	$T D M 2$ /Ma	ε_Hf(0)	ε_Hf(t)	$f Lu / Hf$
GL-1 (古罗岩体)	1	165	0.090 269	0.001 619	0.282 756±0.000 027	714	1 028	-0.55	2.9	-0.96
	2	176	0.076 848	0.001 362	0.282 822±0.000 030	615	871	1.77	5.5	-0.95
	3	165	0.093 650	0.001 705	0.282 830±0.000 026	609	862	2.05	5.5	-0.98
	4	165	0.030 093	0.000 560	0.282 723±0.000 027	741	1 097	-1.74	1.8	-0.96
	5	164	0.071 446	0.001 235	0.282 817±0.000 025	620	889	1.59	5.1	-0.93
	6	165	0.132 881	0.002 177	0.282 841±0.000 030	601	840	2.44	5.8	-0.95
	7	160	0.094 543	0.001 611	0.282 837±0.000 023	597	848	2.31	5.7	-0.96
	8	162	0.079 647	0.001 325	0.282 821±0.000 026	617	882	1.72	5.1	-0.97
	9	163	0.060 721	0.001 059	0.282 693±0.000 026	793	1 168	-2.78	0.7	-0.95
	10	164	0.089 598	0.001 512	0.282 762±0.000 027	704	1 015	-0.36	3.1	-0.93
	11	161	0.135 710	0.002 228	0.282 873±0.000 028	556	771	3.56	6.9	-0.95
	12	163	0.098 089	0.001 644	0.282 773±0.000 024	691	993	0.02	3.4	-0.96
	13	162	0.072 985	0.001 324	0.282 746±0.000 022	723	1 050	-0.91	2.5	-0.94
	15	164	0.110 921	0.001 891	0.282 841±0.000 026	597	840	2.42	5.8	-0.95
	16	161	0.090 756	0.001 517	0.282 769±0.000 027	694	1 001	-0.11	3.3	-0.97
	17	169	0.058 462	0.001 007	0.282 751±0.000 026	710	1 034	-0.75	2.9	-0.94
	18	163	0.108 347	0.001 835	0.282 893±0.000 027	521	722	4.27	7.7	-0.96
	20	164	0.070 769	0.001 247	0.282 795±0.000 025	651	938	0.83	4.3	-0.94
	21	165	0.114 290	0.001 901	0.282 836±0.000 024	604	850	2.27	5.7	-0.95
	22	165	0.093 102	0.001 675	0.282 774±0.000 023	690	989	0.07	3.5	-0.94
	23	161	0.121 754	0.002 080	0.282 777±0.000 029	693	987	0.18	3.5	-0.93
	24	162	0.135 761	0.002 356	0.282 886±0.000 026	538	741	4.04	7.3	-0.94
	25	162	0.106 936	0.001 850	0.282 757±0.000 029	718	1 031	-0.55	2.8	-0.98
	26	166	0.034 608	0.000 645	0.282 742±0.000 022	717	1 054	-1.08	2.5	-0.97
	27	164	0.048 099	0.000 851	0.282 717±0.000 026	755	1 113	-1.96	1.6	-0.96
	28	166	0.079 346	0.001 421	0.282 824±0.000 024	613	872	1.85	5.3	-0.96
	29	164	0.079 920	0.001 368	0.282 821±0.000 023	618	882	1.72	5.2	-0.94
	30	166	0.122 002	0.002 123	0.282 821±0.000 027	629	884	1.74	5.2	-0.96
WJC-2 (王姜冲岩体)	1	158	0.122 478	0.002 081	0.282 863±0.000 028	568	794	3.21	6.5	-0.94
	2	163	0.060 987	0.001 095	0.282 767±0.000 027	689	1 001	-0.17	3.3	-0.97
	3	156	0.062 784	0.001 091	0.282 756±0.000 028	704	1 030	-0.56	2.8	-0.97
	4	156	0.182 452	0.003 059	0.282 920±0.000 030	498	672	5.23	8.3	-0.91
	5	157	0.072 200	0.001 255	0.282 796±0.000 028	651	941	0.85	4.2	-0.96
	6	161	0.057 827	0.000 992	0.282 750±0.000 026	711	1 040	-0.77	2.7	-0.97
	7	159	0.078 144	0.001 339	0.282 747±0.000 022	722	1 050	-0.88	2.5	-0.96
	8	158	0.120 985	0.002 093	0.282 705±0.000 030	798	1 150	-2.36	0.9	-0.94
	9	157	0.097 548	0.001 693	0.282 765±0.000 026	703	1 013	-0.23	3.0	-0.95
	10	157	0.096 685	0.001 687	0.282 779±0.000 025	683	982	0.24	3.5	-0.95
	11	156	0.123 280	0.002 153	0.282 797±0.000 028	665	944	0.90	4.1	-0.94
	12	158	0.180 122	0.002 940	0.282 838±0.000 029	618	855	2.35	5.5	-0.91
	13	160	0.094 577	0.001 638	0.282 774±0.000 023	688	990	0.09	3.4	-0.95
	14	158	0.161 252	0.002 711	0.282 810±0.000 030	656	918	1.35	4.5	-0.92
	16	160	0.070 054	0.001 240	0.282 789±0.000 025	661	955	0.60	4.0	-0.96
	17	157	0.091 408	0.001 603	0.282 786±0.000 026	671	965	0.50	3.8	-0.95
样品及分析点号		年龄/Ma	¹⁷⁶Yb/ ¹⁷⁷Hf	¹⁷⁶Lu/ ¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf±2σ	T_DM /Ma	$T D M 2$ /Ma	ε_Hf(0)	ε_Hf(t)	$f Lu / Hf$
WJC-2 (王姜冲岩体)	18	159	0.085 027	0.001 567	0.282 782±0.000 027	676	973	0.35	3.7	-0.95
	19	161	0.093 584	0.001 698	0.282 809±0.000 030	640	912	1.31	4.7	-0.95
	20	166	0.093 402	0.001 684	0.282 729±0.000 025	755	1 090	-1.52	1.9	-0.95
	21	157	0.059 336	0.001 064	0.282 810±0.000 023	628	908	1.34	4.7	-0.97
	22	160	0.102 317	0.001 782	0.282 715±0.000 028	777	1 125	-2.01	1.3	-0.95
	23	167	0.043 941	0.000 816	0.282 694±0.000 027	787	1 163	-2.77	0.8	-0.98
	24	161	0.126 266	0.002 223	0.282 853±0.000 029	585	817	2.85	6.2	-0.93
	25	159	0.089 278	0.001 601	0.282 788±0.000 024	668	960	0.56	3.9	-0.95
	26	162	0.091 475	0.001 675	0.282 766±0.000 027	701	1 008	-0.20	3.2	-0.95
	27	158	0.128 285	0.002 316	0.282 805±0.000 025	657	928	1.15	4.4	-0.93
	28	156	0.079 977	0.001 469	0.282 719±0.000 026	765	1 117	-1.88	1.4	-0.96
	29	161	0.135 838	0.002 402	0.282 823±0.000 028	631	884	1.82	5.1	-0.93
	30	159	0.128 861	0.002 305	0.282 749±0.000 030	738	1 053	-0.82	2.4	-0.93

Fig.7 εHf(t) (a)and TDM2(Hf) (b) frequency histograms for zircons from the gabbro samples

Fig.8 Nb/Yb vs.Th/Yb ((a),base map after reference [43]) and La/Yb vs. Sm/Yb ((b),base map after reference [44])diagrams for the Guluo and Wangjiangchong gabbros

Fig.9 Ternary 2Nb-Zr/4-Y((a),base map after reference [53]) and Hf/3-Th-Ta((b),base map after reference [54]) tectonic discrimination diagrams for the gabbro samples

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