新疆北部乌恰沟地区镁铁质侵入岩的年代学、地球化学和Sr-Nd-Pb同位素组成：对地幔源区特征和深部过程的约束

陈立辉,韩宝福

新疆北部乌恰沟地区镁铁质侵入岩的年代学、地球化学和Sr-Nd-Pb同位素组成：对地幔源区特征和深部过程的约束

陈立辉,韩宝福

- 北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室，北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室北京 100871 南京大学地球科学系壳幔演化与成矿作用研究国家重点实验室，南京 210093，北京 100871
基金项目:
国家重点基础研究发展规划项目（2001CB409802）资助.致谢本工作受国家重点基础研究发展规划项目（2001CB409802）资助.季建清博士和李辛子、李宗怀两位研究生参加了野外工作.感谢两位评审人的建设性评审.感谢中科院地质与地球物理研究所同位素实验室提供同位素测试.感谢西北大学大陆动力学实验室提供主量元素和微量元素的测试.感谢北京离子探针中心提供锆石SHRIMP U-Pb同位素测试.

收稿日期: 2006-03-13

修回日期: 2006-04-25

刊出日期: 2006-05-31

Geochronology,geochemistry and Sr-Nd-Pb isotopic composition of mafic intrusive rocks in Wuqiagou area,north Xinjiang:Constraints for mantle sources and deep processes.

CHEN LiHui~

Received Date: 13 March 2006

Revised Date: 25 April 2006

Publish Date: 31 May 2006

摘要

摘要: 阿尔泰造山带东段的乌恰沟地区发育大量镁铁质侵入岩(岩脉或小岩体),包括闪长玢岩和具堆积结构的角闪辉长岩和橄榄辉长岩。锆石SHRIMP U-Ph同位素定年结果说明这些镁铁质岩浆的侵位时间为257．4±5．3Ma,与峨眉山玄武岩相近(259±3Ma)。在微量元素原始地幔标准化图上,它们共同的特征是富集大离子亲石元素,亏损Nb和Ta,具K和Pb的正异常,LREE相对HREE富集,即具弧火山岩的地球化学特征。同时它们之间还存在互补的地球化学特征,如闪长玢岩存在Ba、Sr、Eu、P和Ti的负异常,橄榄辉长岩具有Ba、Sr、Eu、P的正异常,而角闪辉长岩具有Ti的正异常。如果扣除围岩混染和后期流体交代的影响,这些岩石的Sr-Nd-Pb同位素组成基本一致,因此闪长玢岩和两种辉长岩分别代表同源岩浆因结晶分离作用形成的演化岩浆和堆晶岩。乌恰沟晚二叠世镁铁质侵入岩和新疆北部早二叠世与铜镍矿有关的基性-超基性杂岩体都具有与弧火山岩相似的地球化学特征,反映了被俯冲改造的陆下岩石圈地幔的地球化学特征。但是与后者相比,前者的Mg~#值、ε_(Nd)(t)值和La/Nb比明显偏低,暗示存在软流圈地幔来源物质的显著贡献。综合阿尔泰乌恰沟地区镁铁质侵入岩的年代学、地球化学和同位素组成特征,我们推测该区在晚二叠世存在地幔柱与岩石圈地幔之间的相互作用。
- 镁铁质侵入岩 /
- 岩石圈地幔 /
- 地幔柱 /
- 地球化学 /
- 同位素 /
- 阿尔泰造山带 /
- 晚二叠世
- Marie intrusive rocks /
- Lithospheric mantle /
- Mantle plume /
- Geochemistry /
- Isotopes /
- Altai orogenic belt /
- Late Permian

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新疆北部乌恰沟地区镁铁质侵入岩的年代学、地球化学和Sr-Nd-Pb同位素组成：对地幔源区特征和深部过程的约束

Geochronology,geochemistry and Sr-Nd-Pb isotopic composition of mafic intrusive rocks in Wuqiagou area,north Xinjiang:Constraints for mantle sources and deep processes.

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