| 西苏门答腊实武牙地区晚三叠世花岗岩锆石年代学及其特提斯构造意义 |
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| 引用本文： | 余小清,钱鑫,卢向红,徐畅,张玉芝,甘成势,王岳军.西苏门答腊实武牙地区晚三叠世花岗岩锆石年代学及其特提斯构造意义[J].地球科学,2021,46(8):2873-2886. |
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| 作者姓名： | 余小清 钱鑫 卢向红 徐畅 张玉芝 甘成势 王岳军 |
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| 作者单位： | 1.中山大学地球科学与工程学院, 广东省地球动力作用与地质灾害重点实验室, 广东广州 510275 |
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| 基金项目： | 国家自然科学基金项目41830211国家自然科学基金项目U1701641国家自然科学基金项目42072256广东省基础与应用基础研究基金项目2018B030312007广东省基础与应用基础研究基金项目2019B1515120019南方海洋科学与工程广东省实验室（珠海）创新团队建设项目311021002 |
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| 摘 要： | 苏门答腊岛位于东特提斯构造域，沿该岛分布了大量不同时代和成因的花岗岩，但这些花岗岩的形成时代和延伸以及对比均未能得到很好的界定，也限制了对东南亚主要岩浆岩带延伸及其构造背景的理解.对西苏门答腊实武牙地区新识别出的花岗岩体开展了精细的LA-ICP-MS锆石U-Pb年代学研究.结果显示，3个花岗岩样品的锆石均为典型的岩浆成因，其岩浆年龄分别为215.1±2.4 Ma（MSWD=0.14）、206.1±5 Ma（MSWD=0.22）、214.3±5 Ma（MSWD=0.11），锆石年代学研究表明西苏门答腊存在晚三叠世的岩浆作用.对比东南亚花岗岩省内同期侵入岩认为，西苏门答腊实武牙地区的晚三叠世花岗岩可与东南亚西部花岗岩省进行对比和联系，该套晚三叠世花岗岩可能形成于中特提斯洋初始俯冲的弧后裂谷环境.
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| 关 键 词： | 西苏门答腊 晚三叠世 花岗岩 锆石U-Pb年龄 地质年代学 东特提斯 |
| 收稿时间： | 2021-03-05 |
Zircon U-Pb Geochronology of Late Triassic Granites from Sibolga Area in Western Sumatra and Its Tethyan Tectonic Implications |
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| Yu Xiaoqing,Qian Xin,Lu Xianghong,Xu Chang,Zhang Yuzhi,Gan Chengshi,Wang Yuejun.Zircon U-Pb Geochronology of Late Triassic Granites from Sibolga Area in Western Sumatra and Its Tethyan Tectonic Implications[J].Earth Science-Journal of China University of Geosciences,2021,46(8):2873-2886. |
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| Authors: | Yu Xiaoqing Qian Xin Lu Xianghong Xu Chang Zhang Yuzhi Gan Chengshi Wang Yuejun |
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| Abstract: | The Sumatra Island, located in the Tethyan tectonic domain, preserves abundant granitoids with various ages and petrogenesis. The paucity of precise geochronological data for these granitoids has hampered our understanding on the extension and tectonic setting of magmatic belts in Southeast Asia. Precise zircon U-Pb geochronological data for granites from the Sibolga area in western Sumatra are presented in this study. Our results suggest that zircon grains from these samples are of igneous origin. LA-ICP-MS zircon U-Pb dating yields crystallization ages of 215.1±2.4 Ma (MSWD=0.14), 206.1±5 Ma (MSWD=0.22) and 214.3±5 Ma (MSWD=0.11) for granites respectively, indicating the Late Triassic magmatism in western Sumatra. Comparing with those of contemporary igneous rocks in Southeast Asia, it proposes that the Late Triassic granites in the Sibolga area are consistent with the West Province granite. Therefore, these granites might be formed in a back-arc rift setting in response to the initial subduction of the Mesotethyan Ocean during the Late Triassic. |
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