40 Ar/ 39 Ar dating of shear deformation of the Xianshuihe fault zone in west Sichuan and its tectonic significance
40 Ar/ 39 Ar dating of shear deformation of the Xianshuihe fault zone in west Sichuan and its tectonic significance
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DOI：
10.1360/03yd0509-x
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发表时间：
2004-09
影响因子：
5.7
通讯作者：
Zhang Yueqiao;C. Wen;Yang Nong
中科院分区：
文献类型：
--
作者：
Zhang Yueqiao;C. Wen;Yang Nong
通过野外地质调查、构造测量和云母、黑云母、钾长石的经典40 Ar/ 39 Ar定年，获得鲜水河断裂带沿着中新世左旋剪切作用的冷却年龄。结果证明了两个热事件在左行剪切。早期事件（12-10 Ma）对应着折多山花岗质岩浆岩从700℃以上快速冷却到350℃以下。晚期事件（5 ~ 3.5Ma）对应于沿着断裂带东侧侵入的花岗岩冷却。这些测年结果为川滇地块晚新生代向东挤压的时间提供了重要的热年代学约束。
Based on field geological survey, structural measurements and classical 40 Ar/ 39 Ar dating of mica, biotite and K-feldspar, we obtain cooling ages for Miocene left-lateral shear along the Xianshuihe fault zone. The results document two thermal events during the sinistral shear. The early event (12－10 Ma) corresponds to rapid cooling of the Zheduoshan granitic massif from above 700℃ to below 350℃. The late event (5－3.5 Ma) corresponds to cooling of granites intruded along the eastern side of the fault zone. These dating results provide important thermochronological constraint on the timing of late Cenozoic eastward extrusion of the Chuan-Dian Block in the SE Tibetan margin.