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Coseismic formation of eclogite facies cataclasite dykes at Yangkou in the Chinese Su-Lu UHP metamorphic belt

Coseismic formation of eclogite facies cataclasite dykes at ...

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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： J.-J.YANG Z.-F.FAN C.YU R.YAN State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

Eclogite facies cataclasite is recognized at Yangkou in the Chinese Su-Lu ultrahigh-P metamorphic *** cataclasite dykes(5à15 cm wide)are bounded by mylonite/ultramylonite zones,cutting through unfoliated metagabbro and/or *** cataclasite veins(generally 2–4 cm wide)are free of mylonite boundary zones,cutting through the foliation of the high-P host *** dykes and veins are dominated by eclogite fragments consisting of debris of omphacite,garnet,quartz,phengite and kyanite,in a matrix of variable amounts of a schist rich in quartz,phengite and *** clasts in the fragments are welded and overgrown by more Ca-rich garnet containing mineral inclusions different from those in the garnet *** micropoikilitic texture of garnet is typical of eclogitic ***-sealing K-feldspar veinlets in the cataclasite dykes also imply frictional or shock-induced melting of *** modal abundances in the cataclasite and the schist imply that the dykes formed by flow of the omphacite and garnet-dominated cataclasites into the fractures during seismic faulting,while the lower density minerals(quartz,phengite and kyanite)were largely left in the ultramylonite boundary *** dykes have the same composition as their host rocks,except for slightly lower Si and large ion lithophile elements and higher Mg,Ca,Cr,Co and ***,probably spurted from the nearby ultramafic rock,is found as rare particles in the cataclasite *** indicates that material exchange occurred by mechanical mixing between the dykes and the ultramafic rock during seismic *** Cr-rich eclogite minerals grown on the chromite are evidence for coseismic high-P ***-lived crystal growth is implied by the fine grain sizes of the eclogite minerals and very limited element diffusion between the garnet clasts and their *** fact that the host rocks are more hydrated implies that the dyke formation was not related to fluid infiltr

关键词： cataclasite dyke earthquake high-P metamorphism mechanical mixing Yangkou.

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