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Compositionally stratified lithosphere and carbonatite metasomatism recorded in mantle xenoliths from the Western Qinling(Central China)

Compositionally stratified lithosphere and carbonatite metas...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Asamoah Sakyi Department of Geology University of Ghana

In Central China,long-distance effects from collision between the North China and Yangtze cratons,uplift of the Tibetan Plateau and subduction of the Pacific Ocean are believed to converge in the Western Ojnling. Mantle xenoliths from Baiguan and Haoti kamafugites in the Western Ojnling were investigated to understand the lithospheric structure and mantle metasomatism beneath the orogenic *** Western Ojnling lithosphere with depths of at least 120 km is geothermally hot and compositionally stratified, companied by a step-wise decrease in fertility with *** shallower portion of the lithospheric mantle is represented by type 2 xenoliths which lack alteration and deformation,and have fertile characteristics in *** dominant rock type in the mantle section is the type 1 peridotites,which have had undergone relatively higher melt extraction and subsequent metasomatism. In-situ trace element data for minerals in the Baiguan and Haoti xenoliths are presented in this study. Baiguan clinopyroxenes have high LREE and show Ba,Th,U,Pb,Sr enrichment and negative Hf and Y anomalies,but the Haoti clinopyroxenes have large variations in trace elements and complicated distributions in LILE,and show negative Ti,Zr and Hf *** from both xenolith types have Ti/Eu and(La/Yb) ratios in large ranges of 902-15,813 and 0-20,*** petrological and geochemical characteristics suggest that the Western Ojnling peridotites had been subjected to silicate and subsequent carbonatite metasomatism,and that carbonatite metasomatism was predominant in Baiguan but lesser in *** with the Western Ojnling carbonatites and world-wide carbonatites indicate that carbonatite melts involved in the metasomatism originated from deep mantle and most likely related to carbonatite magma,with contributions from subducted oceanic *** type 2 peridotites,comprising clinopyroxene megacrysts and clinopyroxenite display similar trace element abundanc

关键词： carbonatite metasomatism Mantle peridotite Stratified lithospheric mantle Western Qinling

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