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Coesite-bearing eclogite breccia:implication for coseismic ultrahigh-pressure metamorphism and the rate of the process

Coesite-bearing eclogite breccia:implication for coseismic u...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Jian-Jun Yang Meng-Xi Huang Qian-Yi Wu Hao-Ran Zhang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

A coesite-bearing eclogite breccia is reported here for the first time at yangkou in the Chinese Su–Lu ultrahigh-pressure(UHP)metamorphic *** is thrusted over a coesite-bearing coronitic eclogite and is gradational to a foliated eclogite at the *** coronitic eclogite is characterized by garnet coronas between fine-grained high-pressure mineral aggregates forming pseudomorphs after plagioclase,ilmenite,biotite,and pyroxene in a gabbroic *** breccia consists of fine-grained cataclastic eclogite fragments(garnet+omphacite+coesite/quartz±phengite±kyanite)and a coarser-grained matrix schist(garnet+quartz+phengite+kyanite).The foliated eclogite consists of intercalating bands of the cataclastic eclogite and a schist similar to the fragments and the matrix,respectively,in the *** igneous fabric of the eclogitized gabbro is increasingly obliterated from the coronitic eclogite through the foliated eclogite to the *** amoeboid garnet containing numerous inclusions of omphacite and other high-pressure minerals is characteristic of eclogite facies pseudotachylytes and suggests flash melting and rapid *** the breccia and foliated eclogite,quartz+K-feldspar±albite aggregates are included in garnet or form strings cutting across the *** some aggregates,quartz grains are cemented by K-feldspar and vesicular albite,also implying crystallization from melts in a rapid cooling and decompression process from the UHP *** field context,the locally preserved igneous fabric in the breccia,the similar whole-rock compositions,as well as the complementary mineral assemblages in the fragments and the matrix with respect to the coronitic eclogite,suggest that the breccia was formed by cataclasis and segregation of minerals in a former coronitic eclogite in response to a sudden pressure *** coesite is found only in the eclogite cataclasites and may have survived via the rapid cooling event,as

关键词： Cataclasis Coesite Earthquake Eclogite breccia Quenching yangkou

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