Zircon chronology and REE geochemistry of granulite xenolith at Hannuoba |
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Authors: | Qicheng Fan Ruoxin Liu Huimin Li Ni Li Jianli Sui Zhuoran Lin |
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Affiliation: | (1) Institute of Geology, State Seismological Bureau, 100029 Beijing, China;(2) Tianjin Institute of Geology and Mineral Resources, Ministry of Geology and Mineral Resources, 300170 Tianjin, China |
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Abstract: | The lower crustal xenolith of mafic two-pyroxene granulite (the majority) and hypersthene granulite in the Cenozoic basalt at Hannuoba have the characteristics of igneous blastic structure and granulite facies metamorphic recrystallization. Study on the zircon chronology and REE geochemistry of granulite xenolith shows that the underplating of basic magma into the lower crust during late Mesozoic led to the formation of mafic accumulate, which further through metamorphism of granulite facies formed the high-density and high-velocity crustal bottom layer at the lower crust. This suggests that the underplating of mantle magma is the important way for the vertical overgrowth of continental crust since the Phanerozoic and provides new evidence for crust-mantle interaction. |
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Keywords: | age of zircon granulite xenolith Hannuoba |
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