| 海南岛晚中生代花岗闪长岩及其包体的锆石U-Pb定年及构造意义 |
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| 引用本文： | 唐立梅,陈汉林,董传万.海南岛晚中生代花岗闪长岩及其包体的锆石U-Pb定年及构造意义[J].地质科学,2014,0(1):259-274. |
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| 作者姓名： | 唐立梅 陈汉林 董传万 |
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| 作者单位： | 1. 国家海洋局第二海洋研究所海底科学重点实验室 杭州 310012;
2. 浙江大学地球科学系 杭州 310027 |
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| 基金项目： | 中国博士后科学基金项目(编号:2011M500991);国家海洋局第二海洋研究所基本科研业务专项(编号:JT1104)资助 |
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| 摘 要： | 海南岛晚中生代的岩浆活动十分强烈，代表性的岩体有千家岩体、屯昌岩体和保城岩体，岩体岩性为花岗闪长岩，其中包含大量的闪长岩包体。系统的LA-ICP-MS锆石U-Pb定年结果表明，花岗闪长岩及包体均形成于101 Ma，为双峰式侵入岩，由来自地幔的高温基性岩浆注入下地壳较酸性的长英质岩浆，两种岩浆同时上侵冷却形成。它们形成的构造环境为板内拉张环境，指示了海南岛于101 Ma处于强烈的岩石圈减薄阶段，这与晚中生代太平洋板块俯冲引起的弧后拉张有关。
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| 关 键 词： | 双峰式侵入岩 锆石U-Pb定年 岩石圈伸展 晚中生代 海南岛 |
| 收稿时间： | 2013-01-25 |
| 修稿时间： | 2013-01-25; |
Zircon U-Pb dating and tectonic significance of Late Mesozoic granodiorite and its enclaves from Hainan Island |
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| Tang Limei,Chen Hanlin,Dong Chuanwan.Zircon U-Pb dating and tectonic significance of Late Mesozoic granodiorite and its enclaves from Hainan Island[J].Chinese Journal of Geology,2014,0(1):259-274. |
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| Authors: | Tang Limei Chen Hanlin Dong Chuanwan |
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| Institution: | 1. Key Laboratory of Submarine Geoscience, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012;
2. Department of Earth Science, Zhejiang University, Hangzhou 310027 |
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| Abstract: | The late Mesozoic magmatism in Hainan Island is very strong, the representative batholiths are Qianjia batholith, Tunchang batholith and Baocheng batholith. The lithology of batholith is granodiorite, which contains a large number of diorite inclusions. LA-ICP-MS zircon U-Pb dating results show that the granodiorite and its inclusions are formed in 101 Ma, belong to bimodal intrusions. Formation of these intrusions is believed to be related to underplating of basalt and consequent heating of the lower crust. And these intrusions formed in intra-plate extensional environment, indicating that the Hainan Island was in strong lithospheric thinning stage in 101 Ma, which maybe related with Pacific plate subduction in Late Mesozoic. |
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| Keywords: | Bimodal intrusive rocks Zircon U-Pb dating Lithospheric extension Late Mesozoic Hainan Island |
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