| 广西德保铜矿钦甲岩体Hf同位素特征及其对壳幔相互作用的指示 |
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| 引用本文： | 王永磊,张长青,王成辉,侯可军.广西德保铜矿钦甲岩体Hf同位素特征及其对壳幔相互作用的指示[J].大地构造与成矿学,2012,36(3):377-383. |
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| 作者姓名： | 王永磊 张长青 王成辉 侯可军 |
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| 作者单位： | 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 |
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| 基金项目： | 中央级公益性科研院所基本科研业务费专项，全国危机矿山接替资源找矿项目“桂东-粤西地区铅锌金等矿床成矿规律总结研究”，深部探测项目 |
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| 摘 要： | 对广西德保铜矿钦甲岩体不同单元中的锆石进行了Hf同位素的研究,结果表明,钦甲岩体中锆石εHf(t)值变化范围为-17.0～+7.8,Hf同位素两阶段模式年龄(tDMC)范围为0.93～2.49Ga,峰值为1.3～1.6Ga,表明它们的岩浆源区主要以中元古代地壳物质为主,同时在成岩过程中有地幔组分的参与,属壳幔混源花岗岩,推测钦甲岩体可能形成于岩石圈伸展的壳幔混合作用环境。华南地区加里东期花岗岩中锆石Hf同位素特征,表明岩浆形成过程中具有明显的地幔物质加入,暗示华南地区在早古生代发生过强烈的壳幔相互作用。
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| 关 键 词： | 加里东期 Hf同位素 钦甲岩体 壳幔相互作用 |
Hf Isotopic Composition of the Qinjia Granites from the Debao Cu Deposit, Guangxi: Implications for Crust-Mantle Interaction |
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| WANG Yonglei
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ZHANG Changqing
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WANG Chenghui
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HOU Kejun.Hf Isotopic Composition of the Qinjia Granites from the Debao Cu Deposit, Guangxi: Implications for Crust-Mantle Interaction[J].Geotectonica et Metallogenia,2012,36(3):377-383. |
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| Authors: | WANG Yonglei ZHANG Changqing WANG Chenghui HOU Kejun |
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| Institution: | (MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China) |
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| Abstract: | Zircon Hf isotopic composition analyses of the Qinjia granites from the Debao Cu deposit,Guangxi,exhibit the εHf(t) values of-17.0~+7.8 and two-stage model ages(tDMC) ranging from 0.93 Ga to 2.49 Ga,with 1.3 Ga to 1.6 Ga for the peak value,indicating that the magma was mainly sourced from the Mesoproterozoic continental crust of the South China Block.Variable εHf(t) values(-17.0 to +7.8) of the Qinjia granites suggest that the magmas were derived from isotopically heterogeneous sources and were formed under lithospheric extensional tectonic background.Zircon Hf isotope compositions of the Caledonian granitoids in South China suggest that the mantle participation through crust-mantle interaction in Early Paleozoic. |
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| Keywords: | Caledonian Hf isotopic composition Qinjia granites crust-mantle interaction |
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