| ~(40)Ar/~(39)Ar dating of shear deformation of the Xianshuihe fault zone in west Sichuan and its tectonic significance |
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| 作者姓名： | ZHANG Yueqiao CHEN Wen & YANG Nong . Institute of Geomechanics Chinese Academy of Geological Sciences Beijing China . Institute of Geology Chinese Academy of Geological Sciences Beijing China . Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China |
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| 作者单位： | ZHANG Yueqiao1，CHEN Wen2，3 & YANG Nong1 1. Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China; 2. Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037，China; 3. Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | TheNW-SEstrikingXianshuihefaultzoneslicesthesoutheasternTibetanPlateauandconnectssoutheastwardwiththeAnninghe-Zemuhe-Xiaojiangfaultzone,whichformahuge,activesinistralstrike-slipfaultzone(fig.1).ThisfaultzoneisanimportantseismicfaultineastTibet1-5].EarthquakegeologystudiesandoffsetpatternsofyounggeologicalfeatureshaveshownthatlateQuaternarysinistralsliprateoftheXianshuihefaultzonereaches13mm/a1,2].TheXianshuhefaultzoneconsistsoftwomainbranches,theDaofufaultbranchinthewestandtheXianshuih…
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40Ar/39Ar dating of shear deformation of the Xianshuihe fault zone in west Sichuan and its tectonic significance |
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| ZHANG Yueqiao,CHEN Wen, & YANG Nong . Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing ,China, . Institute of Geology,Chinese Academy of Geological Sciences,Beijing ,China, . Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing ,China.~(40)Ar/~(39)Ar dating of shear deformation of the Xianshuihe fault zone in west Sichuan and its tectonic significance[J].Science in China(Earth Sciences),2004,47(9). |
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| Authors: | ZHANG Yueqiao CHEN Wen YANG Nong |
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| Institution: | 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Based on field geological survey, structural measurements and classical 40Ar/39Ar 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. |
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| Keywords: | Xianshuihe fault zone Zheduoshan granitic massif sinistral shear deformation ~(40)Ar/~(39)Ar dating late Cenozoic |
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