湘南王仙岭花岗岩体的锆石U-Pb年代学、地球化学、锆石Hf同位素特征及其地质意义

郑佳浩; 郭春丽

湘南王仙岭花岗岩体的锆石U-Pb年代学、地球化学、锆石Hf同位素特征及其地质意义

郑佳浩^1,,
郭春丽²

- 1.
  地质过程与矿产资源国家重点实验室，中国地质大学地球科学与资源学院, 北京 100083
- 2.
  中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室,北京 100037
基金项目:
本文受国土资源部公益性行业科研专项(200911007-11)和国家自然科学重点基金项目(40930419)联合资助.

详细信息

作者简介:
郑佳浩，男，1987年生，硕士生，矿床学与矿床地球化学专业，E-mail:joey-zen@163.com

中图分类号: P588.121; P597.3

收稿日期: 2011-08-12

修回日期: 2011-12-03

刊出日期: 2012-01-01

Geochronology, geochemistry and zircon Hf isotopes of the Wangxianling granitic intrusion in South Hunan Province and its geological significance

ZHENG JiaHao^1,,
GUO ChunLi²

- 1.
  State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
- 2.
  MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 12 August 2011

Revised Date: 03 December 2011

Publish Date: 01 January 2012

摘要

摘要:
湘南王仙岭岩体由主体电气石黑云母花岗岩和侵入其内部的黑云母二长花岗岩组成，LA-MC-ICP MS锆石U-Pb定年显示电气石黑云母花岗岩形成于印支期(235.0±1.3Ma)，黑云母二长花岗岩形成于燕山期(155.9±1.0Ma)，表明该岩体是两期岩浆活动的产物。这两期岩石均为高钾钙碱性系列，A/CNK值为1.07~1.66，属过铝-强过铝质花岗岩类。稀土元素显示LREE富集，HREE亏损，Eu负异常明显(0.01~0.38)的特征。早期电气石黑云母花岗岩和晚期黑云母二长花岗岩的ε_Hf(t)值分别为-7.92~+4.61和-10.66~-5.35；两阶段Hf模式年龄(t_DM2)分别为1758~967Ma和1875~1538Ma。两期花岗岩均来自于古中元古代地壳物质重熔，其中早期电气石黑云母花岗岩在侵位上升过程中捕获了部分幔源老锆石，成岩过程中有少量地幔物质参与，且其源区具有高ε_Hf(t)值的特点。综合前人研究成果，本文认为华南中生代印支期和燕山期均有钨锡矿化作用，印支期花岗质岩浆形成于碰撞挤压作用间隙伸展环境，而燕山期花岗质岩浆可能形成于大陆边缘弧后伸展环境。
- LA-MC-ICP MS锆石U-Pb年龄 /
- 岩石地球化学 /
- 锆石Hf同位素 /
- 王仙岭岩体 /
- 华南
Abstract:
The Wangxianling intrusion in South Hunan Province consists of two granitoids, the main tourmaline biotite granites and the biotite monzonite granites invading into the former. LA-MC-ICP MS zircon U-Pb dating shows that tourmaline biotite granites formed in Indosinian (235.0±1.3Ma) while the biotite monzonite granites formed in Yanshanian (155.9±1.0Ma), indicating that Wangxianling intrusion is the product of two-time magmatic activities. The compositions of these two period granites fall into the calc-alkaline category, with an A/CNK ratio of 1.07~1.66, which are peraluminous to strongly peraluminous granites. Their whole rock rare earth elements demonstrate total LREE enrichment and HREE deficit with significant negative Eu anomalies(0.01~0.38). The ε_Hf(t) values and two-staged Hf model ages of tourmaline biotite granites and biotite monzonite granites are -7.92~+4.61, 1758~967Ma and -10.66~-5.35, 1875~1538Ma, respectively. In this paper we suggest that both the tourmaline biotite granite and biotite monzonite granite are originated from the Paleo-and Mesoproterozoic crustal remelting, and the earlier tourmaline biotite granites captured a large number of mantle-derived zircons and there were high-ε_Hf(t) materials in its source region. Combined with previous research results, we infer that the both Indosinian and Yanshanian periods in South China have tungsten and tin mineralization, the Indosinian granitic magma formed in interval lithosphere extensional environment during the collision compression while the Yanshanian granitic magma formed in the extensional environment of the back arc continental margin.
- LA-MC-ICP MS zircon U-Pb dating /
- Geochemistry /
- Zircon Hf isotopes /
- Wangxianling granitic intrusion /
- South China

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图 1

王仙岭岩体地质图(据湘南地质队，1983改编)

Figure 1.

Geological map of the Wangxianling intrusion

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图 2

王仙岭岩体主要岩相类型手标本照片

Figure 2.

Main lithofacies of the Wangxianling intrusion

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图 3

王仙岭岩体早期电气石黑云母花岗岩、云英岩化电气石花岗岩和晚期黑云母二长花岗岩的显微镜下照片

Figure 3.

Microphotographs of tourmaline biotite granites，greisenization tourmaline granites and the late period of biotite monzonitic granites of the Wangxianling intrusion

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图 4

王仙岭岩体早期电气石黑云母花岗岩和晚期黑云母二长花岗岩的代表性锆石CL图像及测年位置点

Figure 4.

Cathodoluminescence images of zircon and site of analyzed points from the tourmaline biotite granites and the biotite monzonitic granites of the Wangxianling intrusion

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图 5

王仙岭电气石黑云母花岗岩和黑云母二长花岗岩锆石²⁰⁷Pb/²³⁵U-²⁰⁶Pb/²³⁸U谐和图

Figure 5.

Zircon ²⁰⁷Pb/²³⁵U-²⁰⁶Pb/²³⁸U concordia diagram of the Wangxianling tourmaline biotite granite and biotite monzonitic granite

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图 6

王仙岭电气石黑云母花岗岩和黑云母二长花岗岩的SiO₂-Alk分类命名图解(据Cox，1979)

Figure 6.

SiO₂ vs. Alk diagram of Wangxianling tourmaline biotite granite and biotite monzonitic granite(after Cox，1979)

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图 7

王仙岭电气石黑云母花岗岩和黑云母二长花岗岩的SiO₂-K₂O图解(据Morrison，1980)

Figure 7.

SiO₂ vs. K₂O diagram of the Wangxianling tourmaline biotite granite and biotite monzonitic granite(after Morrison，1980)

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图 8

王仙岭电气石黑云母花岗岩和黑云母二长花岗岩的A/CNK-A/NK图解

Figure 8.

A/CNK vs. A/NK diagram of the Wangxianling tourmaline biotite granite and biotite monzonitic granite

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图 9

王仙岭电气石黑云母花岗岩、云英岩化电气石花岗岩和黑云母二长花岗岩的球粒陨石标准化稀土元素配分曲线(标准化值据Sun and McDonough，1989)

Figure 9.

Chondrite-normalized REE patterns of the Wangxianling tourmaline biotite granites，greisenization tourmaline granites and the biotite monzonitic granites(normalization values after Sun and McDonough，1989)

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图 10

王仙岭电石气黑云母花岗岩、云英岩化电气石花岗岩和黑云母二长花岗岩的原始地幔标准化微量元素蛛网图(标准化值据Sun and McDonough，1989)

Figure 10.

Primitive mantle-normalized trace element spidergrams of the Wangxianling tourmaline biotite granites，greisenization tourmaline granites and the biotite monzonitic granites(normalization values after Sun and McDonough，1989)

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图 11

王仙岭电气石黑云母花岗岩和黑云母二长花岗岩的Hf同位素演化图解

Figure 11.

Hf isotopic diagram of the Wangxianling tourmaline biotite granites and the biotite monzonitic granites

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表 1

王仙岭岩体的LA-MC-ICP-MS锆石U-Pb同位素定年结果

Table 1.

Results of LA-MC-ICP-MS zircon U-Pb dating of the Wangxianling granites

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表 2

王仙岭电气石黑云母花岗岩、云英岩化电气石花岗岩和黑云母二长花岗岩的主量元素分析数据(wt%)

Table 2.

Major compositions of the Wangxianling tourmaline biotite granite，greisenization tourmaline granites and the biotite monzonitic granites(wt%)

样品号	SiO₂	TiO₂	Al₂O₃	CaO	Na₂O	K₂O	Fe₂O^T₃	FeO	MgO	MnO	P₂O₅	LOI	K₂O/Na₂O	Na₂O+K₂O	A/CNK
电气石黑云母花岗岩
WXL-1	71.51	0.17	14.62	1.16	2.84	5.08	1.43	0.84	0.67	0.07	0.18	1.92	1.79	7.92	1.19
WXL-2	74.20	0.11	14.31	0.70	3.03	4.20	1.05	0.56	0.47	0.07	0.25	1.70	1.39	7.23	1.32
WXL-3	73.78	0.11	14.39	0.72	2.93	4.50	1.08	0.51	0.43	0.08	0.24	1.58	1.54	7.43	1.31
WXL-4	73.80	0.11	14.57	0.73	3.05	4.42	0.98	0.51	0.41	0.08	0.25	1.58	1.45	7.47	1.31
WXL-5	71.80	0.16	14.71	0.96	2.56	5.50	1.48	0.93	0.84	0.07	0.20	1.88	2.15	8.06	1.24
WXL-6	78.14	0.08	12.37	0.66	1.75	3.10	0.92	0.33	0.36	0.06	0.27	1.64	1.77	4.85	1.66
WXL-8	72.57	0.10	15.18	0.87	3.71	4.50	0.97	0.54	0.30	0.06	0.26	1.46	1.21	8.21	1.21
WXL-9	73.37	0.10	15.21	0.86	3.64	4.38	0.93	0.53	0.26	0.06	0.24	1.48	1.20	8.02	1.24
WXL-10	73.78	0.12	14.77	0.76	3.44	4.13	1.14	0.74	0.38	0.06	0.18	1.44	1.20	7.57	1.28
云英岩化电气石花岗岩
WXL-11	76.70	0.09	14.68	0.69	0.25	2.71	0.96	0.23	0.28	0.04	0.13	2.68	10.84	2.96	3.19
WXL-12	69.07	0.07	19.66	0.94	0.54	2.78	1.53	0.37	0.45	0.05	0.35	3.30	5.15	3.32	3.51
WXL-13	72.47	0.05	18.00	0.80	0.34	2.56	0.98	0.19	0.29	0.04	0.19	3.30	7.53	2.90	3.76
WXL-14	72.68	0.07	17.09	1.08	0.37	2.69	1.26	0.20	0.36	0.05	0.41	2.94	7.27	3.06	3.12
WXL-19	76.12	0.10	14.60	0.57	0.32	3.57	0.99	0.18	0.25	0.05	0.30	2.22	11.16	3.89	2.69
WXL-20	74.75	0.10	15.78	0.41	0.37	4.02	1.08	0.22	0.28	0.03	0.29	2.34	10.86	4.39	2.77
WXL-21	76.88	0.09	14.67	0.36	0.25	3.79	0.99	0.21	0.24	0.05	0.26	2.56	15.16	4.04	2.84
WXL-22	75.98	0.10	15.08	0.48	0.40	3.32	1.08	0.20	0.27	0.05	0.28	2.14	8.30	3.72	2.94
WXL-23	76.94	0.08	14.71	0.40	0.28	3.75	0.83	0.19	0.22	0.03	0.27	1.20	13.39	4.03	2.80
黑云母二长花岗岩
WXL-15	75.95	0.04	12.73	0.63	3.29	4.75	1.46	1.07	0.05	0.06	0.01	0.88	1.44	8.04	1.09
WXL-16	77.24	0.04	12.26	0.72	3.24	4.50	1.03	7.18	0.11	0.02	0.01	1.00	1.39	7.74	1.07
WXL-17	76.09	0.03	12.82	0.61	3.57	4.60	1.16	0.81	0.04	0.04	0.02	0.78	1.29	8.17	1.07
WXL-18	77.98	0.03	11.76	0.47	3.07	4.64	0.97	0.49	0.08	0.04	0.01	0.92	1.51	7.71	1.08

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表 3

王仙岭电气石黑元母花岗岩、云英岩化电气石花岗岩和黑云母二长花岗岩的稀土元素分析数据(×10^-6)

Table 3.

REE compositions of the Wangxianling tourmaline biotite granites, greisenizating tourmaline granites and the biotite monzonitic granites (×10^-6)

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表 4

王仙岭电气石黑元母花岗岩、云英岩化电气石花岗岩和黑云母二长花岗岩的微量元素分析数据(×10^-6)

Table 4.

Trace element compositions of the Wangxianling tourmaline biotite granites, greisenization tourmaline granites and the biotite monzonitic granites (×10^-6)

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表 5

王仙岭岩体早期电气石黑云母花岗岩、云英岩化电气石花岗岩和黑云母二长花岗岩的锆石Hf同位素分析结果

Table 5.

Zircon Hf isotopic compositions of the Wangxianling tourmaline biotite granites，greisenization tourmaline granites and biotite monzonitic granites

测点号	t(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ_m	¹⁷⁶Hf/¹⁷⁷Hf_i	ε_Hf(t)	t_DM(Ma)	t_DM2(Ma)	f_Lu/Hf
WXL-4(电气石黑云母花岗岩)
WXL4-1	232	0.137385	0.001928	0.282619	0.000026	0.282611	-0.61	918	1298	-0.94
WXL4-3	239	0.113062	0.001581	0.282469	0.000019	0.282462	-5.73	1124	1626	-0.95
WXL4-4	237	0.187474	0.002576	0.282600	0.000027	0.282588	-1.29	963	1346	-0.92
WXL4-8	236	0.173629	0.002374	0.282574	0.000020	0.282563	-2.21	996	1403	-0.93
WXL4-15	233	0.177896	0.002256	0.282541	0.000024	0.282531	-3.40	1040	1475	-0.93
WXL-14(云英岩化电气石花岗岩)
WXL14-2	453	0.137341	0.002004	0.282644	0.000025	0.282627	4.87	883	1122	-0.94
WXL14-3	231	0.115013	0.001621	0.282411	0.000018	0.282404	-7.92	1207	1758	-0.95
WXL14-6	231	0.165997	0.002182	0.282768	0.000026	0.282759	4.61	707	967	-0.93
WXL14-7	434	0.175181	0.002406	0.282525	0.000024	0.282505	0.13	1068	1407	-0.93
WXL14-8	231	0.158493	0.002122	0.282579	0.000020	0.282570	-2.09	981	1391	-0.94
WXL14-9	903	0.006785	0.000110	0.281954	0.000018	0.281952	-9.03	1781	2335	-1.00
WXL14-11	858	0.055406	0.000730	0.282060	0.000016	0.282048	-6.66	1665	2153	-0.98
WXL14-14	231	0.123478	0.001888	0.282563	0.000016	0.282555	-2.61	998	1424	-0.94
WXL14-15	450	0.061741	0.000935	0.282353	0.000015	0.282345	-5.19	1266	1752	-0.97
WXL14-17	1011	0.120583	0.001629	0.282265	0.000016	0.282234	3.34	1415	1647	-0.95
WXL14-18	2440	0.059523	0.000804	0.281016	0.000015	0.280979	-8.71	3090	3482	-0.98
WXL14-20	231	0.166607	0.002343	0.282501	0.000015	0.282491	-4.87	1101	1566	-0.93
WXL-16(黑云母二长花岗岩)
WXL-16-2	159	0.056376	0.002033	0.282378	0.000020	0.282372	-10.66	1269	1875	-0.94
WXL-16-4	155	0.032758	0.001244	0.282439	0.000023	0.282436	-8.49	1155	1736	-0.96
WXL-16-7	155	0.140164	0.005044	0.282433	0.000028	0.282418	-9.10	1295	1774	-0.85
WXL-16-8	157	0.084101	0.002961	0.282488	0.000021	0.282479	-6.91	1139	1638	-0.91
WXL-16-9	154	0.025353	0.001013	0.282418	0.000028	0.282415	-9.24	1179	1783	-0.97
WXL-16-10	157	0.066319	0.002233	0.282480	0.000024	0.282473	-7.12	1128	1651	-0.93
WXL-16-11	157	0.038059	0.001248	0.282411	0.000030	0.282407	-9.47	1196	1799	-0.96
WXL-16-15	154	0.087039	0.002768	0.282533	0.000029	0.282525	-5.35	1066	1538	-0.92
WXL-16-18	154	0.014363	0.000591	0.282433	0.000022	0.282431	-8.68	1144	1746	-0.98
WXL-16-19	156	0.052882	0.001833	0.282458	0.000027	0.282453	-7.87	1147	1697	-0.94
注：ε_Hf(0) =[(¹⁷⁶Hf/¹⁷⁷Hf)_S/(¹⁷⁶Hf/¹⁷⁷Hf)_CHUR，0－1]×10，000;ε_Hf(t)={[(¹⁷⁶Hf/¹⁷⁷Hf)_S－(¹⁷⁶Lu/¹⁷⁷Hf)_S×(e^λt－1)]/[(¹⁷⁶Hf/¹⁷⁷Hf)_CHUR，0－(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR×(e^λt－1)]－1}×10，000;t_Hf1=1/λ×ln{1+[(¹⁷⁶Hf/¹⁷⁷Hf)_S－(¹⁷⁶Hf/¹⁷⁷Hf)_DM]/[(¹⁷⁶Lu/¹⁷⁷Hf)_S－(¹⁷⁶Lu/¹⁷⁷Hf)_DM]};t_Hf2=t_Hf1－(t_Hf1-t)[(f_CC-f_S)/(f_CC-f_DM)](f_CC，f_S，f_DM分别为大陆地壳、样品和亏损地幔的f_Lu/Hf);f_Lu/Hf=(¹⁷⁶Lu/¹⁷⁷Hf)_S/(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR－1;(¹⁷⁶Hf/¹⁷⁷Hf)_i=(¹⁷⁶Hf/¹⁷⁷Hf)_S－(¹⁷⁶Lu/¹⁷⁷Hf)_S×(e^λt－1)，其中:(¹⁷⁶Lu/¹⁷⁷Hf)_S和(¹⁷⁶Hf/¹⁷⁷Hf)_S为样品测定值，(¹⁷⁶Hf/¹⁷⁷Hf)_CHUR，0＝0.282772，(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR＝0.0332；(¹⁷⁶Hf/¹⁷⁷Hf)_DM，t＝0.28325，(¹⁷⁶Lu/¹⁷⁷Hf)_DM＝0.0384；λ=1.867×10^-11a^-1

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参考文献(80)

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湘南王仙岭花岗岩体的锆石U-Pb年代学、地球化学、锆石Hf同位素特征及其地质意义

作者简介: 郑佳浩，男，1987年生，硕士生，矿床学与矿床地球化学专业，E-mail:joey-zen@163.com

Geochronology, geochemistry and zircon Hf isotopes of the Wangxianling granitic intrusion in South Hunan Province and its geological significance

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作者简介:
郑佳浩，男，1987年生，硕士生，矿床学与矿床地球化学专业，E-mail:joey-zen@163.com