桂东南古罗和王姜冲钾玄质辉长岩的成因:地球化学、锆石U-Pb年代学及Hf同位素特征制约

doi:10.19657/j.geoscience.1000-8527.2019.032

摘要/Abstract

摘要：

古罗和王姜冲岩体产于扬子地块与华夏地块拼合带的西南段,对剖析华南区域构造演化过程具有重要的地质意义。古罗和王姜冲岩体主要由辉长岩及少量的闪长岩组成。LA-ICP-MS锆石U-Pb年代学分析表明,古罗和王姜冲辉长岩的侵位结晶时限分别为(163±1) Ma和(158±1) Ma,属于燕山期岩浆活动的产物。岩石无Nb、Ta负异常,具有板内钾玄岩系列特征,锆石的ε_Hf(t)值主要集中在0.7~8.3之间,其二阶段Hf模式年龄($T_{DM_{2}}$)为672~1 168 Ma,暗示其源区主要为新元古代—中元古代岩石圈地幔。综合地球化学、锆石Hf同位素组成特征及区域地质资料,认为古罗和王姜冲岩体是在板内伸展-减薄环境主要由亏损的软流圈地幔和富集的岩石圈地幔岩浆混合形成,且在上升过程中受到壳源组分混染。

关键词: 燕山期, 桂东南, 古罗岩体, 王姜冲岩体, 钾玄质, 辉长岩

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

中图分类号:

农军年, 郭尚宇, 孙明行, 唐娟红, 覃瑞才, 周秋娥. 桂东南古罗和王姜冲钾玄质辉长岩的成因:地球化学、锆石U-Pb年代学及Hf同位素特征制约[J]. 现代地质, 2020, 34(05): 1001-1014.

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.

图/表 12

图1 区域大地构造位置图 (a)、区域构造简图(b)和古罗地区地质图(c)((a)据文献[14]修改;(b)据文献[12]修改;(c)据文献[15]修改) 1.黄洞口组三段;2.黄洞口组二段;3.黄洞口组一段;4.小内冲组;5.培地组;6.侏罗世辉长岩;7.花岗岩;8.逆断层及产状;9.断层;10.年龄样位置点

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

图2 古罗辉长岩野外露头及镜下照片 (a)辉长岩手标本;(b)辉长岩,辉长结构;(c)辉长岩,角闪石边缘被绿色角闪石取代;(d)辉长岩,片状黑云母中含有束状矽线石次生蚀变矿物;Prx .辉石;Hb.角闪石;Pl .斜长石;Bit .黑云母;Sil.矽线石;Ap.磷灰石

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

表1 古罗和王姜冲辉长岩LA-ICP-MS锆石U-Pb年龄分析数据

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

表1 古罗和王姜冲辉长岩LA-ICP-MS锆石U-Pb年龄分析数据

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

图3 古罗辉长岩和(b)王姜冲辉长岩代表性锆石颗粒CL图像(图中虚线圈为锆石U-Pb测年点,实线圈为锆石Hf同位素分析点,圈内数字为样品点编号;年龄值单位为Ma,括号内数值为εHf (t)值)

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

图4 古罗辉长岩(a)和王姜冲辉长岩(b)LA-ICP-MS锆石U-Pb谐和图

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

表2 古罗和王姜冲辉长岩样品主量元素(wB/%)、微量元素(wB/10-6)及稀土元素(wB/10-6)分析结果

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

表2 古罗和王姜冲辉长岩样品主量元素(wB/%)、微量元素(wB/10-6)及稀土元素(wB/10-6)分析结果

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

图5 辉长岩样品SiO2-(K2O+ Na2O)((a),底图据文献[28])和SiO2-K2O图解((b),底图据文献[29,30] ) Ir.Irvine分界线,上方为碱性,下方为亚碱性;1.橄榄辉长岩;2a.碱性辉长岩;2b.亚碱性辉长岩;3.辉长闪长岩;4.闪长岩;5.花岗闪长岩;6.花岗岩;7.硅英岩;8.二长辉长岩;9.二长闪长岩;10.二长岩;11.石英二长岩;12.正长岩;13.副长石辉长岩;14.副长石二长闪长岩;15.副长石二长正长岩;16.副长正长岩;17.副长深成岩;18.霓方钠岩/磷霞岩/粗白榴岩

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])

图6 辉长岩样品稀土元素球粒陨石标准化配分图((a),底图据文献[31])和微量元素原始地幔标准化蛛网图((b),底图据文献[31])

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])

表3 古罗和王姜冲辉长岩样品LA-MC-ICP-MS锆石Lu-Hf同位素分析结果

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

表3 古罗和王姜冲辉长岩样品LA-MC-ICP-MS锆石Lu-Hf同位素分析结果

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

图7 辉长岩样品锆石εHf(t)(a)和TDM2(Hf) (b)频率直方图

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

图8 古罗和王姜冲辉长岩Nb/Yb-Th/Yb((a),底图据文献[43])和La/Yb-Sm/Yb图解((b), 底图据文献[44]) OIB.洋岛玄武岩;E-MORB.富集型洋中脊玄武岩;N-MORB.正常型洋中脊玄武岩

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

图9 辉长岩样品2Nb-Zr/4-Y图解((a),底图据文献[53] )和Hf/3-Th-Ta图解((b),底图据文献[54] ) A1.WPAB;A2.WPAB+WPT;B.E-MORB;C.WPT+VAB;D.N-MORE+VAB。IAT.岛弧拉斑玄武岩;CAB.火山弧钙碱性玄武岩;N-MORB.正常型洋中脊玄武岩;E-MORB.富集型洋中脊玄武岩;WPAB.板内碱性玄武岩;WPT.板内拉斑玄武岩

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

参考文献 54

[1]	许德如, 贺转利, 李鹏春, 等. 湘东北地区晚燕山期细碧质玄武岩的发现及地质意义[J]. 地质科学, 2006,41(2):311-332.
[2]	LI X H, LI W X, LI Z X. On the genetic classification and tectonic implications of the Early Yanshanian granitoids in the Nanling Range, South China[J]. Science Bulletin, 2007,52(14):1873-1885.
[3]	YE H M, MAO J R, ZHAO X L, et al. Revisiting Early-Middle Jurassic igneous activity in the Nanling Mountains, South China: Geochemistry and implications for regional geodynamics[J]. Journal of Asian Earth Sciences, 2013,72(4):108-117. DOI URL
[4]	WANG Y, FAN W, ZHANG G, et al. Phanerozoic tectonics of the South China Block: Key observations and controversies[J]. Gondwana Research, 2013,23(4):1273-1305. DOI URL
[5]	MILLET L. Geochronological and geochemical results from Mesozoic basalts in southern South China Block support the flat-slab subduction model[J]. Lithos, 2012,132:127-140. DOI URL
[6]	ZHOU X M, LI W X. Origin of Late Mesozoic igneous rocks in Southeastern China: Implications for lithosphere subduction and underplating of mafic magmas[J]. Tectonophysics, 2000,326(3):269-287. DOI URL
[7]	JIANG Y H, WANG G C, LIU Z, et al. Repeated slab advanceâ retreat of the Palaeo-Pacific plate underneath SE China[J]. International Geology Review, 2015,57(4):472-491. DOI URL
[8]	CHEN C H, LEE C Y, SHINJO R. Was there Jurassic paleo-Pacific subduction in South China?: Constraints from ⁴⁰Ar/ ³⁹Ar dating, elemental and Sr-Nd-Pb isotopic geochemistry of the Mesozoic basalts [J]. Lithos, 2008,106(1/2):83-92. DOI URL
[9]	WANG Y J, FAN W M, GUO F, et al. Geochemistry of Mesozoic mafic rocks adjacent to the Chenzhou-Linwu fault, South China: Implications for the lithospheric boundary between the Yangtze and Cathaysia Blocks[J]. International Geology Review, 2003,45(3):263-286. DOI URL
[10]	WANG Y, FAN W, PENG T, et al. Elemental and Sr-Nd isotopic systematics of the Early Mesozoic volcanic sequence in southern Jiangxi Province, South China: petrogenesis and tectonic implications[J]. International Journal of Earth Sciences, 2005,94(1):53-65. DOI URL
[11]	MÜLLER D, GROVES D I. Potassic Igneous Rocks and Associated Gold-copper Mineralization[M]. Berlin:Springer-verlag, 2000: 265-266.
[12]	李献华, 周汉文, 刘颖, 等. 桂东南钾玄质侵入岩带及其岩石学和地球化学特征[J]. 科学通报, 1999,44(18):1992-1998.
[13]	卢成忠. 浙江梧村地区钾玄质岩浆岩的发现及其找矿意义[J]. 现代地质, 2007,21(3):443-450.
[14]	农军年, 邹瑜, 邱恩露, 等. 桂东南大村和古龙岩体的成因:地球化学、锆石U-Pb年龄及Hf同位素制约[J]. 地质通报, 2017,36(2/3):224-237.
[15]	许华, 黄炳诚, 倪战旭, 等. 广西大瑶山古罗碱性辉长岩体LA-ICP-MS锆石U-Pb年龄、岩石学、地球化学及其构造意义[J]. 华南地质与矿产, 2014,30(4):342-351.
[16]	张云, 孙立新, 张天福, 等. 内蒙古狼山地区乌花辉长岩的年代学、地球化学和Sr-Nd-Hf同位素组成:对地幔源区特征和岩石成因的约束[J]. 现代地质, 2020,34(3):1-16.
[17]	SLÁMA J, KOSTLER J, CONDON D J, et al. Plesovice-a new natural reference material for U-Pb and Hf isotopic microanalysis[J]. Chemical Geology, 2008,249(1/2):1-35. DOI URL
[18]	ANDERSEN T. Correction of common lead in U-Pb analyses that do not report ²⁰⁴Pb [J]. Chemical Geology, 2002,192(1/2):59-79. DOI URL
[19]	LUDWIG K R. User’s Manual for a Geochronological Toolkit for Microsoft Excel (Isoplot/Ex Version 3.0)[M]. Berkeley: Berkeley Geochronology Center, 2003: 1-70.
[20]	侯可军, 李延河, 田有荣. LA-MC-ICP-MS锆石微区原位U-Pb定年技术[J]. 矿床地质, 2009,28(4):481-492.
[21]	SCHERER E, MUNKER C, MEZGER K. Calibration of the lutetium-hafnium clock[J]. Science, 2001,293:683-687. DOI URL PMID
[22]	BLICHERTTOFT J, ALBAREDE F. The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system[J]. Earth and Planetary Science Letters, 1997,148(1/2):243-258. DOI URL
[23]	VERVOORT J D, BLICHERT-TOFT J. Evolution of the depleted mantle: Hf isotope evidence from juvenile rocks through time[J]. Geochimica et Cosmochimica Acta, 1999,63(3/4):533-556. DOI URL
[24]	GRIFFIN W L, WANG X, JACKSON S E, et al. Zircon chemistry and magma mixing, SE China: In-situ analysis of Hf isotopes, Tonglu and Pingtan igneous complexes[J]. Lithos, 2002,61(3/4):237-269. DOI URL
[25]	BELOUSOVA E A, GRIFFIN W L, O’REILLY S Y,et al. Igneous zircon: trace element composition as an indicator of source rock type[J]. Contributions to Mineralogy and Petrology, 2002,143(5):602-622. DOI URL
[26]	CHEN F, HEGNER E, TODT W. Zircon ages and Nd isotopic and chemical compositions of orthogneisses from the Black Forest, Germany: evidence for a Cambrian magmatic arc[J]. International Journal of Earth Sciences, 2000,88(4):791-802. DOI URL
[27]	BARROS C E D, NARDI L V S, DILLENBURG S R, et al. Detrital minerals of modern beach sediments in southern Brazil: a provenance study based on the chemistry of zircon.[J]. Journal of Coastal Research, 2010,26(1):80-93.
[28]	MIDDLEMOST E A K. Naming materials in the magma/igneous rock system[J]. Earth Science Reviews, 1994,37(3/4):224.
[29]	PECCERILLO A, TAYLOR S R. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey[J]. Contributions to Mineralogy and Petrology, 1976,58(1):63-81. DOI URL
[30]	MIDDLEMOST E A K. Magmas and Magmatic Rocks: An Introduction to Igneous Petrology[M]. London:Longman, 1985.
[31]	SUN S S, MCDONOUGH W F. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes[J]. Geological Society,London, Special Publication, 1989,42:313-345. DOI URL
[32]	许华, 倪战旭, 潘艺文, 等. 1∶25万贵县幅(F49C001002)区域地质调查成果报告[R]. 南宁:广西壮族自治区地质调查院, 2013.
[33]	广西壮族自治区地质局区域普查大队. 广西1∶20万桂平幅区域地质测量报告[R]. 南宁:广西壮族自治区地质局, 1964.
[34]	广西壮族自治区地质矿产局. 广西壮族自治区区域地质志[M]. 北京: 地质出版社, 1985.
[35]	李江, 张耿, 周娟华, 等. 广西1∶50万数字地质图说明书[R]. 南宁:广西壮族自治区地质矿产勘查开发局, 2006.
[36]	WYLLIE P J, SEKINE T. The formation of mantle phlogopite in subduction zone hybridization[J]. Contributions to Mineralogy & Petrology, 1982,79(4):375-380.
[37]	MENZIES M. Alkaline rocks and their inclusions: a window on the Earth’s interior[J]. Geological Society, London, Special Publications, 1987,30(1):15-27. DOI URL
[38]	ROGERS N W. Potassic magmatism as a key to trace-element enrichment processes in the upper mantle[J]. Journal of Volcano-logy & Geothermal Research, 1992,50(1):85-99.
[39]	MÜLLER D, ROCK N M S, GROVES D I. Geochemical discrimination between shoshonitic and potassic volcanic rocks in different tectonic settings: A pilot study[J]. Mineralogy & Petrology, 1992,46(4):259-289.
[40]	MCKENZIE D, BICKLE M J. The volume and composition of melt generated by extension of the lithosphere[J]. Journal of Petrology, 1988,29(3):625-679. DOI URL
[41]	刘彬, 马昌前, 蒋红安, 等. 东昆仑早古生代洋壳俯冲与碰撞造山作用的转换:来自胡晓钦镁铁质岩石的证据[J]. 岩石学报, 2013,29(6):2093-2106.
[42]	HUANG Y, HAWKESWORTH C, SMITH I, et al. Geochemistry of Late Cenozoic basaltic volcanism in Northland and Coromandel, New Zealand: implications for mantle enrichment processes[J]. Chemical Geology, 2000,164(3/4):219-238. DOI URL
[43]	PEARCE J A. Geochemical fingerprinting of oceanic basalts with applications to ophiolite classification and the search for Archean oceanic crust[J]. Lithos, 2008,100(1/4):14-48. DOI URL
[44]	XU Xisheng, XIN X. Late Mesozoic-Cenozoic basaltic rocks and crust-mantle interaction, SE China[J]. Geological Journal of China Universities, 2005,11(3):318-334.
[45]	王冠, 孙丰月, 李碧乐, 等. 东昆仑夏日哈木铜镍矿镁铁质-超镁铁质岩体岩相学、锆石U-Pb年代学、地球化学及其构造意义[J]. 地学前缘, 2014,21(6):381-401.
[46]	吴福元, 李献华, 郑永飞, 等. Lu-Hf同位素体系及其岩石学应用[J]. 岩石学报, 2007,23(2):185-220.
[47]	ANDERSON D L. Large Igneous Provinces, Delamination, and Fertile Mantle[J]. Elements, 2005,1(5):271-275. DOI URL
[48]	WANG Y, ZHANG A, FAN W, et al. Origin of paleosubduction-modified mantle for Silurian gabbro in the Cathaysia Block: Geochronological and geochemical evidence[J]. Lithos, 2013,160/161(1):37-54. DOI URL
[49]	FLÈCHE M R L, CAMIRÉ G, JENNER G A. Geochemistry of post-Acadian, Carboniferous continental intraplate basalts from the Maritimes Basin, Magdalen Islands, Québec, Canada[J]. Chemical Geology, 1998,148(3/4):115-136. DOI URL
[50]	WILSON M. Review of igneous petrogenesis: a global tectonic approach[J]. Terra Nova, 2010,1(2):218-222. DOI URL
[51]	郭新生, 陈江峰, 张巽, 等. 桂东南富钾岩浆杂岩的Nd同位素组成:华南中生代地幔物质上涌事件[J]. 岩石学报, 2001,17(1):19-27.
[52]	ROGERS N W, JAMES D, KELLEY S P, et al. The generation of potassic lavas from the eastern Virunga Province, Rwanda[J]. Journal of Petrology, 1998,39(6):1223-1247. DOI URL
[53]	MESCHEDE M. A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram[J]. Chemical Geology, 56(3/4):207-218. DOI URL
[54]	WOOD D A. Avariably veined suboceanic upper mantle-genetic significance for mid-ocean ridge basalts from geochemical evidence[J]. Geology, 1979,7:499-503. DOI URL