Early Cooling History of Eclogites from the Dabie-Sulu Orogen: Constraints from Diffusion Kinetics of Garnet
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Early Cooling History of Eclogites from the Dabie-Sulu Orogen: Constraints from Diffusion Kinetics of Garnet
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    摘要:

    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℃/Ma subsequent to peak metamorphic temperatures, whereas the cold eclogite gives a relatively slow cooling rate of 8℃/Ma at its initial exhumation. A very slow cooling rate of <0.3℃/Ma is obtained for the granulite at Huangtuling, suggesting that the granulite may not be involved in the continental deep subduction.

    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℃/Ma subsequent to peak metamorphic temperatures, whereas the cold eclogite gives a relatively slow cooling rate of 8℃/Ma at its initial exhumation. A very slow cooling rate of <0.3℃/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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CHEN Daogong and CHENG Hao School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, School of Ocean and Earth Science, Tongji University, Shanghai .2004. Early Cooling History of Eclogites from the Dabie-Sulu Orogen: Constraints from Diffusion Kinetics of Garnet[J]. ACTA GEOLOGICA SINICA(English edition),78(3):

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