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Carbonated Big Mantle Wedge Extending to the NE Edge of the Stagnant Pacific Slab:Constraints from Late Mesozoic-Cenozoic Basalts from Far Eastern Russia

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Journal of Earth Science 2022年第1期33卷 121-132页

作者： Ronghua Cai Shan Xu Dmitri AIonov Jian Huang Sheng-Ao Liu Shuguang Li Jingao Liu State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China Géosciences Montpellier Universitéde Montpellier34095 MontpellierFrance CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China

It has been suggested that the carbonated mantle reflected by mg-zn isotopic anomalies of Cenozoic intraplate basalts from East Asia coincides with the stagnant West Pacific slab in the mantle transition ***,the northern boundary of such carbonated domain beneath East Asia is *** Mesozoic-Cenozoic intraplate basalts are widespread in far eastern Russia and thus provide an opportunity to examine this *** we report major-trace element contents and Sr-Ndmg-zn isotopic compositions for 9 Late Mesozoic-Cenozoic basaltic samples from the Khanka Block and Sikhote-Alin accretionary *** are characterized by large variations in SiO_(2)contents(41 wt.%to 50 wt.%)and CaO/Al_(2)O_(3)(0.50 to 0.97),enrichments of large-ion lithophile elements(LILE),positive Nb-Ta anomalies and strongly negative K,Pb,Zr,Hf,Ti,Y anomalies in primitive mantle-normalized trace element spider ***,the rocks show good correlations of Ti/Ti^(*)with Hf/Hf^(*),La/Yb,Fe/Mn and trace element contents(e.g.,Nb).In addition,they have lighter mg and heavier zn isotope compositions than the BSE estimates,coupled with depleted Sr-Nd isotope *** elemental and isotopic characteristics cannot be explained by alteration,magma differentiation or diffusion,but are consistent with the partial melting of carbonated *** and large,the Late Mesozoic-Cenozoic basalts from far eastern Russia bear very similar geochemical characteristics as those Na-series Cenozoic basalts from eastern *** extended region of mg-zn isotopic anomalies is roughly coincident with the stagnant West Pacific slab beneath East Asia,and all of these alkali basalts can be generated from mantle sources hybridized by recycled mg-carbonates from the Pacific slab stagnant in the mantle transition *** infer that(1)the carbonated big mantle wedge extends to the NE edge of the West Pacific slab and may have also appeared in the Late Mesozoic due to the effect of the Paleo-Pac

关键词： mg-zn isotopes deep carbon cycling far eastern Russia isotopes big mantle wedge

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