| Evidence of microstructures and fluid inclusions for the origin of polycrystalline quartz ribbons in high-grade metamorphic rocks in Daqingshan region |
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| 作者姓名： | LIU ZhengHong XU ZhongYuan & WANG KeYong College of Earth Science Jilin university Changchun China |
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| 作者单位： | LIU ZhengHong，XU ZhongYuan & WANG KeYong College of Earth Science，Jilin university，Changchun 130061，China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (Grant No. 40572117) |
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| 摘 要： | Polycrystalline quartz ribbons in high-grade metamorphic rocks from the Daqingshan region, are typi- cal microfabrics of, and provide information for, deep crust deformation and metamorphism. The quartz ribbons have straight boundaries and extend stably along gneissosity. They truncate other mineral grains in the rocks and may contain inclusions of such minerals that are lens-shaped and oriented. They frequently end into branching termination. Analysis fluid inclusions in polycrystalline quartz rib- bons reveal that the complex types of fluid inclusions are inhomogeneously distributed. They are ob- viously different from inclusions captured at granulite facies, in both fluid compositions and T-P esti- mations. Based on microfabric and fluid inclusion analysis, the polycrystalline quartz ribbons are suggested to be formed by SO2-rich fluids filling micro-fractures that are parallel to early gneissosity. The SO2 composition is derived from the deformed host rocks. The fluid phase has significant effects on the rheological characteristics, fracturing of rocks, and formation of quartz ribbons.
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| 收稿时间： | 5 January 2006 |
| 修稿时间： | 5 July 2006 |
Evidence of microstructures and fluid inclusions for the origin of polycrystalline quartz ribbons in high-grade metamorphic rocks in Daqingshan region |
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| LIU ZhengHong,XU ZhongYuan & WANG KeYong College of Earth Science,Jilin university,Changchun ,China.Evidence of microstructures and fluid inclusions for the origin of polycrystalline quartz ribbons in high-grade metamorphic rocks in Daqingshan region[J].Science in China(Earth Sciences),2007,50(4):496-504. |
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| Authors: | Liu ZhengHong Xu ZhongYuan Wang KeYong |
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| Institution: | (1) College of Earth Science, Jilin university, Changchun, 130061, China |
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| Abstract: | Polycrystalline quartz ribbons in high-grade metamorphic rocks from the Daqingshan region, are typi- cal microfabrics of, and provide information for, deep crust deformation and metamorphism. The quartz ribbons have straight boundaries and extend stably along gneissosity. They truncate other mineral grains in the rocks and may contain inclusions of such minerals that are lens-shaped and oriented. They frequently end into branching termination. Analysis fluid inclusions in polycrystalline quartz rib- bons reveal that the complex types of fluid inclusions are inhomogeneously distributed. They are ob- viously different from inclusions captured at granulite facies, in both fluid compositions and T-P esti- mations. Based on microfabric and fluid inclusion analysis, the polycrystalline quartz ribbons are suggested to be formed by SO2-rich fluids filling micro-fractures that are parallel to early gneissosity. The SO2 composition is derived from the deformed host rocks. The fluid phase has significant effects on the rheological characteristics, fracturing of rocks, and formation of quartz ribbons. |
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| Keywords: | polycrystalline quartz ribbon fluid inclusion microstructure Daqingshan |
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