| Garnet-bearing Granulite Facies Rock Xenoliths from Late Mesozoic Volcaniclastic Breccia, Xinyang, Henan Province |
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| 作者姓名： | ZHENG Jianping SUN Min LU Fengxiang WANG Chunyangand ZHONG Zengqiu Faculty of Earth Sciences China University of Geosciences Wuhan China |
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| 作者单位： | ZHENG Jianping，SUN Min，LU Fengxiang，WANG Chunyangand ZHONG Zengqiu Faculty of Earth Sciences，China University of Geosciences，Wuhan 430074，China Department of Earth Sciences，The University of Hong Kong，China |
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| 摘 要： | This paper presents the primary results of petrologic, mineralogical and petrochemical studies of garnet-bearing granulite facies rock xenoliths from Xinyang, Henan Province. These xenoliths, which are found in a pipe of late Mesozoic volcaniclastic breccia, are of high density (3.13-3.30 g/cm3) and high seismic velocity (Vp = 7.04-7.31 km/s), being products of underplating of basaltic magmas and had experienced granulite facies metamorphism. The underplating and metamorphism took place before the eruption of the host rock. Petrographical studies and equilibrium T-P calculations show that these xenoliths were captured at a 49 km depth and experienced at least a 16 km uplift before they were captured. The dynamics of the uplift could be related to the continent-continent collision between the North China plate and the Yangtze plate during the Triassic.
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Garnet-bearing Granulite Facies Rock Xenoliths from Late Mesozoic Volcaniclastic Breccia, Xinyang, Henan Province |
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| Authors: | ZHENG Jianping SUN Min LU Fengxiang WANG Chunyangand ZHONG Zengqiu Faculty of Earth Sciences China University of Geosciences Wuhan China |
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| Institution: | ZHENG Jianping,SUN Min,LU Fengxiang,WANG Chunyangand ZHONG Zengqiu Faculty of Earth Sciences,China University of Geosciences,Wuhan,China Department of Earth Sciences,The University of Hong Kong,China |
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| Abstract: | This paper presents the primary results of petrologic, mineralogical and petrochemical studies of garnet-bearing granulite facies rock xenoliths from Xinyang, Henan Province. These xenoliths, which are found in a pipe of late Mesozoic volcaniclastic breccia, are of high density (3.13-3.30 g/cm3) and high seismic velocity (Vp = 7.04-7.31 km/s), being products of underplating of basaltic magmas and had experienced granulite facies metamorphism. The underplating and metamorphism took place before the eruption of the host rock. Petrographical studies and equilibrium T-P calculations show that these xenoliths were captured at a 49 km depth and experienced at least a 16 km uplift before they were captured. The dynamics of the uplift could be related to the continent-continent collision between the North China plate and the Yangtze plate during the Triassic. |
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| Keywords: | granulite facies mafic rock xenolith uplift Xinyang |
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