| Early Cooling History of Eciogites from the Dabie-Sulu Orogen： Constraints from Diffusion Kinetics of Garnet |
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| 摘 要： |
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| 关 键 词： | 石榴石 扩散动力学 榴辉岩 Dabie-Sulu 地球年代学 超高压 |
Early Cooling History of Eclogites from the Dabie‐Sulu Orogen: Constraints from Diffusion Kinetics of Garnet |
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| Authors: | CHEN Daogong CHENG Hao |
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| Abstract: | Abstract For the first time, we apply different geospeedometric models to garnet zoning patterns that were obtained in this study from detailed EMP analyses for garnets from eclogites and granulite in the Dabie‐Sulu orogen. Various zonings of cation diffusion were preserved in the garnets, enabling the acquirement of average cooling rates for the high‐to ultrahigh‐pressure rocks without using geochronological approaches. The coesite‐bearing hot eclogites yield fast cooling rates of about 20 to 30°C/Ma subsequent to peak metamorphic temperatures, whereas the cold eclogite gives a relatively slow cooling rate of 8°C/Ma at its initial exhumation. A very slow cooling rate of <0.3°C/Ma is obtained for the granulite at Huangtuling, suggesting that the granulite may not be involved in the continental deep subduction. |
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| Keywords: | garnet cooling history diffusion kinetics eclogite Dabie‐Sulu |
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