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| ~(40)Ar/~(39)Ar Dating of Deformation Events and Reconstruction of Exhumation of Ultrahigh-Pressure Metamorphic Rocks in Donghai, East China | |
| 作者姓名： | LI Jinyi YANG Tiannan CHEN Wen and ZHANG Sihong Institute of Geology Chinese Academy of Geological Sciences Beijing E-mail: jyli@cags.net.cn |
| 作者单位： | LI Jinyi，YANG Tiannan，CHEN Wen and ZHANG Sihong Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037E-mail: jyli@cags.net.cn |
| 摘 要： | Recent investigations reveal that the ultrahigh-pressure metamorphic (UHPM) rocks in the Donghai region of East China underwent ductile and transitional ductile-brittle structural events during their exhumation. The earlier ductile deformation took place under the condition of amphibolite facies and the later transitional ductile-brittle deformation under the condition of greenschist facies. The hanging walls moved southeastward during both of these two events. The 40Ar/39Ar dating of muscovites from muscovite-plagioclase schists in the Haizhou phosphorous mine, which are structurally overlain by UHPM rocks, yields a plateau age of 218.0±2.9 Ma and isochron age of 219.8Ma, indicating that the earlier event of the ampibolite-facies deformation probably took place about 220 Ma ago. The 40Ar/39Ar dating of oriented amphiboles parallel to the movement direction of the hanging wall on a decollement plane yields a plateau age of 213.1±0.3 Ma and isochron age of 213.4±4.1 Ma, probably representing the age o |
~(40)Ar/~(39)Ar Dating of Deformation Events and Reconstruction of Exhumation of Ultrahigh-Pressure Metamorphic Rocks in Donghai, East China |
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| Authors: | LI Jinyi YANG Tiannan CHEN Wen and ZHANG Sihong Institute of Geology Chinese Academy of Geological Sciences Beijing E-mail: jyli@cagsnetcn |
| Abstract: | |
| Keywords: | ultrahigh-pressure metamorphic rocks structural deformation 40Ar/39Ar dating exhumation Donghai East China |
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