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《Earth Science(Journal of China University of Geosciences)》 2013-06
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Petrogenesis of the Zhongzaohuo Ultramafic Pyroxenite Pluton,East Kunlun: Constraints from Petrology,Geochemistry and Genetic Mineralogy

LUO Wen-xing;QIAN Li-li;LI De-weia;ZHU Yun-hai;LIU De-min;GAO Cheng;Three Gorges Geotechnical Consultants Co.,Ltd;Faculty of Earth Sciences,China University of Geosciences;Research Center of Tibetan Plateau,China University of Geoscience;Institute of Geological Survey,China University of Geosciences;  
A ultramafic pyroxenite pluton has been discovered in Zhongzaohuo area in the East Kunlun orogen Recently.This paper reports the results of petrological,geochemical and genetic mineralogy research on the pyroxenite pluton.The rock is mainly composed of clinopyroxene,orthopyroxene and amphibole,and minor plagioclase,quartz,biotite and iron opaque min- erals.Amphibole and biotite were formed during retrograde metamorphism.The discriminant analysis results suggest that the Opx are magmatogenic,thus the rock should be named pyroxenite rather than granulite.The rock has high MgO,CaO and low Al2 O3 and enriched in Rb and Th and depleted in Nb and Ti,showing clear evidence for an enriched mantle source.Field occur- rence of the pyroxenite pluton suggests that the pyroxenite pluton was formed after the mylonization of the surrounding rocks. Combined with the tectonic evolution of East Kunlun,we come to the conclusion that the subduction of an Paleo-Tethys(Anyemaqen)oceanic slab at the Middle Permian led to fluid and Si-rich?melt metasomatism,inducing partial melting of an enriched lithospheric mantle(peridotites)to form the ultramafic pyroxenite magma.The pyroxenite magma underplated the overlying lower crust,captured the metamorphic zircons of the granulite and exchanged some trace elements,but didnt result in the lower crust partial melting to form any felsic magma.The pyroxenite magma emplaced alone eventually.
【Fund】: 国家自然科学基金项目(Nos.40572113 40974040 41172188);; 国家深部专项(No.SinoProbe-01-03-02);; 中国地质调查局区调项目(No.1212010914036)
【CateGory Index】: P588.124
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