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The Neoarchean ultramafic–mafic complex in the Yinshan Block,North China Craton:Magmatic monitor of development of Archean lithospheric mantle

The Neoarchean ultramafic–mafic complex in the Yinshan Bloc...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Dan Wang Jinghui Guo Guangyu Huang Mark Scheltens State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking University

Neoarchean ultramafic–mafic complexes are critical for characterizing the embryonic continental lithosphere and hence for arbitrating the extrapolation of plate tectonics into the Archean *** geochronological and geochemical study documents the newly identified amphibolite-to granulite-facies Xiwulanbulang(XWLBL)ultramafic–mafic complex in the Yinshan Block,North China Craton(NCC).It is composed mainly of meta-gabbro,hornblendite and *** U–Pb zircon dating on the later granite constrains a minimum formation age of～2581 Ma for the complex,whereas the metamorphic zircons from the hornblendite and coexisting kyanite-garnet gneiss yield a metamorphic age of～2.50 *** dominant meta-gabbros in the complex show an"MORB"composition,and characterized by an LREE-depleted to flat REE pattern,yet possessing prominent Nb,Zr and Ti depletions,which suggest dual geochemical *** with their depletedεNd(t)isotope compositions(+1.77 to+2.23)and regional high temperature high Mg#basaltic magmatism,we suggest that they may have been produced by interaction of the upwelling asthenosphere with the metasomatized lithospheric *** hornblendites/pyroxenites that occurred in the complex display high Mg O(13.6–20.2 wt.%),Ca O(7.5–13.8 wt.%),Cr(475–2049 ppm)and Ni(154–859 ppm)contents,reflecting they have originated either as a crystal mush magma or high-degree partial melts of a mantle *** show moderately fractionated REE patterns((La/Yb)N=2.9–10.7)but depletedεNd(t)(+1.48 to+3.53)and zirconεHf(t)(up to+7.3)*** their negative anomalies for Nb,Zr and Ti relative to neighboring REE,we suggest that the mantle source of the hornblendites was refractory depleted peridotite that experienced prior basaltic magma extraction followed by metasomatism of subduction-related *** variations trend in both major and trace elements between the hornblendites and the associated serpentinites support their genetic *** Ca

关键词： Neoarchean hornblendites Mafic-ultramafic rocks Yinshan Block North China Craton

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