| 冈底斯中段卡热辉长岩锆石U- Pb年代学、地球化学及构造意义 |
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| 引用本文： | 徐向珍,熊发挥,杨经绥,巴登珠,张然,段建兵,赵娇.冈底斯中段卡热辉长岩锆石U- Pb年代学、地球化学及构造意义[J].地质学报,2019,93(10):2542-2555. |
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| 作者姓名： | 徐向珍 熊发挥 杨经绥 巴登珠 张然 段建兵 赵娇 |
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| 作者单位： | 地幔研究中心,自然资源部深地动力学重点实验室,中国地质科学院地质研究所,北京,100037;核资源与环境省部共建国家重点实验室培育基地,东华理工大学,南昌,330013 |
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| 基金项目： | 本文为国家自然科学基金项目（编号41672046、41502062、41720104009）、中国地质调查局工作项目（编号DD20160023- 01、DD20190060）联合资助成果。 |
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| 摘 要： | 以冈底斯中段曲水县西南方向卡热乡一带出露的辉长岩为研究对象,进行了LA-ICP-MS锆石UPb测年以及全岩地球化学的系统测定,据此讨论岩石的成因及其构造意义。该辉长岩主要由单斜辉石和斜长石组成,辉长岩具有低硅、贫碱、富铝,中等富集轻稀土,富集大离子亲石元素,亏损高场强元素的地球化学特征,与岛弧和大陆边缘地区产出的高铝玄武岩化学组成十分相似,表明辉长岩原生岩浆为被俯冲改造的岩石圈幔源岩浆,在演化过程中受到了上地壳物质的混染。锆石LA-ICP-MS U-Pb年龄为49.01±0.51Ma(MSWD=0.41),指示岩体形成时代为始新世。卡热辉长岩具有显著亏损的锆石Hf同位素组成,εHf(t)值均为正值,分布在+10.88～+13.71之间,综合分析表明卡热辉长质侵入体可能为近期遭受俯冲板片析出流体交代作用的亏损地幔部分熔融的产物。结合区域构造演化史认为该岩体在冈底斯南缘的始新世期间存在着强烈的岩浆底侵和壳幔岩浆混合作用。
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| 关 键 词： | 辉长岩 LA-ICP-MS锆石U-Pb测年 岩石成因 冈底斯 西藏 |
| 收稿时间： | 2019/8/2 0:00:00 |
| 修稿时间： | 2019/8/26 0:00:00 |
Zircon U- Pb dating and geochemistry of the Kare gabbro in the middle segment of the Gangdese belt and its tectonic implications |
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| XU Xiangzhen,XIONG Fahui,YANG Jingsui,BA Dengzhu,ZHANG Ran,DUAN Jianbing and ZHAO Jiao.Zircon U- Pb dating and geochemistry of the Kare gabbro in the middle segment of the Gangdese belt and its tectonic implications[J].Acta Geologica Sinica,2019,93(10):2542-2555. |
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| Authors: | XU Xiangzhen XIONG Fahui YANG Jingsui BA Dengzhu ZHANG Ran DUAN Jianbing and ZHAO Jiao |
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| Institution: | 1) CARMA (Center for Advanced Research on Mantle), Key Laboratory of Deep- Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037,1) CARMA (Center for Advanced Research on Mantle), Key Laboratory of Deep- Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037,1) CARMA (Center for Advanced Research on Mantle), Key Laboratory of Deep- Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037,1) CARMA (Center for Advanced Research on Mantle), Key Laboratory of Deep- Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037,1) CARMA (Center for Advanced Research on Mantle), Key Laboratory of Deep- Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037,2) State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang, 330013 and 2) State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang, 330013 |
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| Abstract: | |
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| Keywords: | Gabbro LA- ICP- MS zircon U- Pb dating petrogenesis Gangdise Tibet |
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