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

作     者：Ronghua Cai Shan Xu Dmitri AIonov Jian Huang Sheng-Ao Liu Shuguang Li Jingao Liu Ronghua Cai;Shan Xu;Dmitri A.Ionov;Jian Huang;Sheng-Ao Liu;Shuguang Li;Jingao Liu

作者机构：State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesBeijing 100083China Géosciences MontpellierUniversitéde Montpellier34095 MontpellierFrance CAS Key Laboratory of Crust-Mantle Materials and EnvironmentsSchool of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2022年第33卷第1期

页      面：121-132页

核心收录：

学科分类：070902[理学-地球化学] 070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.41730214,41822301,and 41790451) the National Key R&D Program of China(Nos.2019YFA0708400,2020YFA0714800,and 2019YFC0605403) China“1000 Youth Talents Program” the“111”Project(No.B18048) the pre-research project on Civil Aerospace Technologies(No.D020202)from Chinese National Space Administration Chinese Academy of Sciences President’s International Fellowship Initiative(PIFI)for Visiting Scientists in 2019(No.2017VCA0009) CUGB petro-geochemical contribution No.PGC-201572(RIG-No.11) 

主　　题：Mg-Zn isotopes deep carbon cycling far eastern Russia isotopes big mantle wedge 

摘      要：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