| Aragonite from Mulanshan Glaucophane Schist: Implications for Regional Evolution of Southwestern Dabie Mountains, Central China |
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| 作者姓名： | Zhao Wenyu Center of Material Research and Analysis Wuhan University of Technology Wuhan Liu Rong Wang QinyanFaculty of Earth Sciences China University of Geosciences Wuhan Peng Changqi Zhang QingjieCenter of Material Research and Anal |
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| 作者单位： | Zhao Wenyu Center of Material Research and Analysis，Wuhan University of Technology，Wuhan 430070Liu Rong Wang QinyanFaculty of Earth Sciences，China University of Geosciences，Wuhan 430074 Peng Changqi Zhang QingjieCenter of Material Research and Anal |
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| 基金项目： | theNationalNaturalScienceFoundationofChina (No .4980 2 0 0 4) |
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| 摘 要： | ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓａｎａｃｋｎｏｗｌｅｄｇｅｄｆａｃｔｔｈａｔａｒａｇｏｎｉｔｅ,ａｈｉｇｈ ｐｒｅｓｓｕｒｅｐｏｌｙｍｏｒｐｈｏｆＣａＣＯ3 ,ｏｃｃｕｒｓｗｉｄｅｌｙａｓａｎｉｎｄｅｘｍｉｎｅｒａｌｏｆｈｉｇｈ ｐｒｅｓｓｕｒｅａｎｄｌｏｗ ｔｅｍｐｅｒａｔｕｒｅｍｅｔａｍｏｒｐｈｉｓｍ (ｇｌａｕｃｏｐｈａｎｅｓｃｈｉｓｔｆａｃｉｅｓ)ｗｉｔｈｉｎｔｈｅｇｅｏｄｙｎａｍｉｃｃｏｎｔｅｘｔｏｆｓｕｂｄｕｃｔｉｏｎ ｏｂｄｕｃｔｉｏｎａｎｄｃｏｎｔｉｎｅｎｔａｌｃｏｌｌｉｓｉｏｎ (Ｌｉｏｕ…
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Aragonite from Mulanshan Glaucophane Schist:Implications for Regional Evolution of Southwestern Dabie Mountains, Central China |
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| Zhao Wenyu Center of Material Research and Analysis,Wuhan University of Technology,Wuhan Liu Rong Wang QinyanFaculty of Earth Sciences,China University of Geosciences,Wuhan Peng Changqi Zhang QingjieCenter of Material Research and Anal.Aragonite from Mulanshan Glaucophane Schist: Implications for Regional Evolution of Southwestern Dabie Mountains, Central China[J].Journal of China University of Geosciences,2001,12(3). |
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| Authors: | Zhao Wenyu ZHANG Qingjie Wang Qinyan Liu Rong Peng Changqi |
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| Abstract: | The aragonite, an index mineral of glaucophane schist facies, has not been confirmed in the Dabie Mountains high-pressure and ultrahigh-pressure metamorphic belts. The Mulanshan glaucophane schist in Huangpi County, Hubei Province is located in the southwestern Dabie Mountains, Central China.The micron-sized intergranular aragonite is confirmed with optical microscope (OM) and electron probe microaualysis (EPMA) in the glaucophane schist. The submicrometer-sized ellipse aragonite inclusion is observed by using bright-field image ( BFI), X-ray energy-damage spectrograph (EDS) and selected area electron diffraction (SAED) with transmission electron microscope in the quartz lens of glaucophane-albite-epidote-chlorite schist from Mulanshan. The presence of aragonite indicates not only the average geothermal gradient of the Mulanshan glaucophane schist less than 10 ℃/km, which is very close to that of eclogite in the Dabie Mountains metamorphic belts, but also the relatively higher concentration of CO2 during the metamorphic process. In addition, the glaucophane schist free of such index minerals as lawsonite, prehnite and pumpellyite, has been attributed to the effect of CO2 on the stability of ca] cium aluminum silicate minerals during the low-grade metamorphism. EDS and SAED analysis results show that the host of aragonite inclusion is amorphous SiO2. The occurrence of amorphous SiO2 indicates a quick cooling process during the exhumation of the Mulanshan glaucophane schist. These results suggest that the rapid exhumation mechanism of the glaucophane schist, the same as that of eclogite in the Dabie Mountains metamorphic belts, occurred in the geodynamic context of subduction-obduction.`` |
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| Keywords: | aragonite amorphous SiO2 stability of calcium aluminum silicate minerals quick cooling exhumation mechanism |
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