| The Lanshantou Kyanite-bearing Eclogite with Coesite Inclusions in the Sulu Ultrahigh-Pressure Metamorphic Belt and Its PTt Path |
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| 作者姓名： | HU Shouxi SUN Jinggui LING Hongfei YE Ying Fang Changquan and ZHAO Yiying |
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| 作者单位： | HU Shouxi，SUN Jinggui，LING Hongfei，YE Ying，Fang Changquan and ZHAO Yiying Department of Earth Sciences，Nanjing University，Nanjing 210008，Jiangsu Department of Earth Sciences，Zhejiang University，Hangzhou 310027，Zhejiang |
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| 摘 要： | Coesite inclusions are found in kyanite from the Lanshantou eclogite in the Sulu ultrahigh-pressure (UHP) metamorphic belt. This discovery extends the stable region of kyanite to over 2.4 GPa. As an important UHP metamorphic belt in China, the Sulu eclogite belt is the product of A-subduction induced by strong compression of the Yellow Sea terrane to the Jiaodong-northereastern Jiangsu terrane during the interaction of the Eurasian plate and Palaeo-Pacific plate in the Indosinian. It stretches about 350 km and contains over 1000 eclogite bodies. Most eclogites in this belt belong to Groups B and C in the classification of Coleman et al., and commonly contain kyanite, while the Lanshantou eclogite belongs to Group A and contains coesite. The MgO, CaO and FeO contents in garnet and pyroxene show regular variation from the core to the rim, which reveals the PTt paths of progressive metamorphism during the Early Mesozoic (240-200 Ma) and retrogressive metamorphism during the Late Mesozoic and Cenozoic exhum
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The Lanshantou Kyanite-bearing Eclogite with Coesite Inclusions in the Sulu Ultrahigh-Pressure Metamorphic Belt and Its PTt Path |
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| Authors: | HU Shouxi SUN Jinggui LING Hongfei YE Ying Fang Changquan and ZHAO Yiying |
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| Institution: | HU Shouxi,SUN Jinggui,LING Hongfei,YE Ying,Fang Changquan and ZHAO Yiying Department of Earth Sciences,Nanjing University,Nanjing,Jiangsu Department of Earth Sciences,Zhejiang University,Hangzhou,Zhejiang |
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| Abstract: | Coesite inclusions are found in kyanite from the Lanshantou eclogite in the Sulu ultrahigh-pressure (UHP) metamorphic belt. This discovery extends the stable region of kyanite to over 2.4 GPa. As an important UHP metamorphic belt in China, the Sulu eclogite belt is the product of A-subduction induced by strong compression of the Yellow Sea terrane to the Jiaodong-northereastern Jiangsu terrane during the interaction of the Eurasian plate and Palaeo-Pacific plate in the Indosinian. It stretches about 350 km and contains over 1000 eclogite bodies. Most eclogites in this belt belong to Groups B and C in the classification of Coleman et al., and commonly contain kyanite, while the Lanshantou eclogite belongs to Group A and contains coesite. The MgO, CaO and FeO contents in garnet and pyroxene show regular variation from the core to the rim, which reveals the PTt paths of progressive metamorphism during the Early Mesozoic (240-200 Ma) and retrogressive metamorphism during the Late Mesozoic and Cenozoic exhumation. |
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| Keywords: | coesite-bearing kyanite eclogite ultrahigh-pressure (UHP) metamorphic belt PTt path of subduction and exhumation |
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