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High-pressure granulites in the Sanggan area,North China craton:metamorphic evolution,p-t paths and geotectonic significance

High-pressure granulites in the Sanggan area,North China cra...

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中国科学院地质与地球物理研究所2002学术年会

作者： p.J.O’Brien Institut fuer Geowissenschaften Universitaet Potsdam601553 PotsdamGermany

High-pressure basic granulites are widely distributed as enclaves and sheet-like blocks in the Huaian ttG gneiss terrane in the Sanggan area of the Central Zone of the North China craton. Four stages of the metamorphic history have been recognized in mineral assemblages based on inclusion,exsolution and reaction textures integrated with garnet zonation patterns as revealed by compositional maps and compositional profiles.p-t conditions for each metamorphic stage were obtained using thermodynamically- and experimentally-calibrated *** low-Ca core of growth-zoned garnet,along with inclusion minerals,defines a prograde assemblage (M1) of garnet+clinopyroxene+plagioclase+quartz,yielding 700℃and 10 *** peak of metamorphism at about 750-870℃and 11-14.5 kbar(M2) is defined by high-Ca domains in garnet interiors and inclusion minerals of clinopyroxene,plagioclase and *** or coronas of orthopyroxene+plagioclase±magnetite around garnet porphyroblasts indicate garnet breakdown reactions(M3) at conditions around 770-830℃and 8.5-10.5 *** exsolution lamellae in clinopyroxene and kelyphites of amphibole+plagioclase around garnet formed during cooling process at about 500-650℃and 5.5-8 kbar(M4).these results help define a sequential p-t path containing prograde,near-isothermal decompression(ItD) and near-isobaric cooling(IBC) stages. the clockwise hybrid ItD and IBC p-t paths of the Hp granulites in the Sanggan area imply a model of thickening followed by extension in a collisional ***,the relatively high-pressures(6-14.5 kbar) of the four metamorphic stages and the geometry of the p-t paths suggest that the Hp granulites,together with their host Huaian ttG gneisses,represent the lower-plate in a crust thickened during *** corresponding upper-plate might be the tectonically overlying Khondalite series,which was subjected to medium- to low-pressure(Mp/Lp: 7-4 kbar) granulite facies metamorphism with a clock

关键词： High-pressure granulite reaction textures p-t paths paleoproterozoic North China craton

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