| Role of Water in Deformed Omphacite in UHP Eclogite from the Dabie Mountains, Eastern China |
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| 作者姓名： | SU Wen YOU Zhendong CONG Bolin and YE KaiLaboratory of Lithosphere Tectonic Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing E-mail: suwen@mail.igcas.ac.cnChina University of Geosciences Wuhan Hubei Xie Guanglian |
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| 作者单位： | SU Wen，YOU Zhendong，CONG Bolin and YE KaiLaboratory of Lithosphere Tectonic Evolution，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029; E-mail: suwen@mail.igcas.ac.cnChina University of Geosciences，Wuhan，Hubei 430074 Xie Guanglian |
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| 基金项目： | 科技部资助项目，国家自然科学基金 |
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| 摘 要： | Omphacite grains from UHP eclogite of the Dabie Mountains in eastern China are elongated and show strong lattice preferred orientations (LPOs). Observations by the transmission electron microscopy (TEM) identified not only structures of plastic deformation occurring as free dislocation, dislocation loops and dislocation walls, but also bubbles of water present in the deformed omphacite. The bubbles attach to the dislocation loops which are often connected to one another via a common bubble. Using infrared spectroscopy (IR), two types of hydrous components are identified as hydroxyl and free-water in the omphacite. An analysis of deformation mechanism of microstructure in omphacite suggests that the mineral deformed plastically under UHP metamorphic conditions by dislocation creep through hydrolitic weakening.
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| 关 键 词： | UHP 形成 绿辉石 榴辉岩 大别山 中国 变质岩 地球运动 |
Role of Water in Deformed Omphacite in UHP Eclogite from the Dabie Mountains, Eastern China |
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| Authors: | SU Wen YOU Zhendong CONG Bolin and YE KaiLaboratory of Lithosphere Tectonic Evolution |
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| Institution: | SU Wen,YOU Zhendong,CONG Bolin and YE KaiLaboratory of Lithosphere Tectonic Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,E-mail: suwen@mail.igcas.ac.cnChina University of Geosciences,Wuhan,Hubei Xie Guanglian |
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| Abstract: | Omphacite grains from UHP eclogite of the Dabie Mountains in eastern China are elongated and show strong lattice preferred orientations (LPOs). Observations by the transmission electron microscopy (TEM) identified not only structures of plastic deformation occurring as free dislocation, dislocation loops and dislocation walls, but also bubbles of water present in the deformed omphacite. The bubbles attach to the dislocation loops which are often connected to one another via a common bubble. Using infrared spectroscopy (IR), two types of hydrous components are identified as hydroxyl and free-water in the omphacite. An analysis of deformation mechanism of microstructure in omphacite suggests that the mineral deformed plastically under UHP metamorphic conditions by dislocation creep through hydrolitic weakening. |
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| Keywords: | deformation hydrolitic weakening omphacite UHP eclogite Dabie Mountains China |
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