| 滇西高黎贡剪切带内花岗质糜棱岩LA-ICP-MS锆石U-Pb年龄及其构造意义 |
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| 引用本文： | 李再会,王立全,林仕良,丛峰,谢韬,邹光富.滇西高黎贡剪切带内花岗质糜棱岩LA-ICP-MS锆石U-Pb年龄及其构造意义[J].地质通报,2012,31(8):1287-1295. |
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| 作者姓名： | 李再会 王立全 林仕良 丛峰 谢韬 邹光富 |
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| 作者单位： | 中国地质调查局成都地质矿产研究所,四川成都,610081 |
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| 基金项目： | 国家重点基础发展规划项目，中国地质调查局项目 |
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| 摘 要： | 高黎贡变质带位于高黎贡走滑剪切带以西,呈SN向或NE-SW向带状展布,是滇西最显著的带状变质带之一,被认为是前寒武纪变质基底。选取高黎贡剪切带内的花岗质糜棱岩进行LA-ICP-MS锆石U-Pb定年,分别获得了41.9Ma±1.0Ma的岩浆结晶年龄和38.4Ma±2.1Ma的变质年龄。结合区域地质背景、地质演化、岩石组构和年代学资料,认为花岗质糜棱岩原岩结晶年龄为42Ma,遭受糜棱岩化的变质时间为38Ma,同时表明高黎贡剪切带右行走滑的起始时间为38Ma以前。
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| 关 键 词： | 高黎贡走滑剪切带 花岗质糜棱岩 LA-ICP-MS锆石U-Pb年龄 滇西 |
LA-ICP-MS zircon U-Pb age of granitic mylonite in the Gaoligong shear zone of western Yunnan Province and its tectonic significance |
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| LI Zai-hui
,
WANG Li-quan
,
LIN Shi-liang
,
CONG Feng
,
XIE Tao
,
ZOU Guang-fu.LA-ICP-MS zircon U-Pb age of granitic mylonite in the Gaoligong shear zone of western Yunnan Province and its tectonic significance[J].Geologcal Bulletin OF China,2012,31(8):1287-1295. |
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| Authors: | LI Zai-hui WANG Li-quan LIN Shi-liang CONG Feng XIE Tao ZOU Guang-fu |
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| Institution: | Chengdu Institute of Geology and Mineral Resources,China Geological Survey,Chengdu 610081,Sichuan,China |
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| Abstract: | The NS or NE-SW trending Gaoligong metamorphic belt lying in southwest Yunnan Province is distributed along west Gaoligongshan strike-slip shear zone. It is composed of high-degree metamorphic rock, which has been considered as Precambrian metamorphic basement before. In this paper, U-Pb zircon dating was carried out by using LA-ICP-MS for granitic mylonite from the Gaoligongshan shear zone. It yielded the weighted average age of 41.9Ma±1.0Ma from magma zircons and that of 38.4Ma±2.1Ma from the metamorphic overgrowth rims of zircon, respectively. Combined with regional geological background, geological evolution, rock fabric and geochronological data, this paper has drawn the conclusion that the granitic mylonite was crystallized at 42Ma and underwent mylonitization at 38Ma, indicating that the Gaoligong strike-slip shear zone was active as a dextral strike-slip shear zone at least from 38Ma. |
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| Keywords: | Gaoligong strike-slip shear zone granitic mylonite LA-ICP-MS zircon U-Pb age western Yunnan |
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