Tracing crustal contamination of the Cenozoic basalts with OIB-affinity in northern marginal region of North China Craton:An Os perspective

作     者：Zhuang Li Bin Chen Zhuang Li;Bin Chen

作者机构：State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Beijing)Beijing 102249China College of GeosciencesChina University of Petroleum(Beijing)Beijing 102249China Department of Earth and Space SciencesSouthern University of Science and TechnologyShenzhen 518055China 

出 版 物：《China Geology》 (中国地质（英文）)

年 卷 期：2021年第4卷第4期

页      面：593-599页

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：This work was supported financially by Beijing Natural Science Foundation(8194073) the Science Foundation of China University of Petroleum,Beijing(2462017YJRC032 and 2462021YXZZ004) the Science Foundation of State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing(PRP/indep-4-1702) the National Natural Science Foundation of China(41872057 and 42002238) 

主　　题：Crustal contamination OIB-like basalt Os isotope Os concentration Geological survey engineering Inner Mongolia North China Craton China 

摘      要：The Cenozoic basalts with OIB-affinity in northern marginal region of the North China Craton are thought to experience minor even no crustal contamination during the magma *** whole-rock Sr-Nd-Pb-Hf isotopes are attributed to a two-component mixing between depleted and enriched mantle sources,while the major element variations are controlled by the fractional crystallization of olivine and ***,in this study,the new Os isotopic data proposes an opposite model for the Cenozoic basalts in northern marginal region of the North China *** this model,the Jining basalts were contaminated by the Archean mafic rocks during the magma storage and *** crustal contamination process is supported by(1)the highly radiogenic Os isotopic compositions,and(2)the positive correlation between 187Os/188Os and 1/Os of the Jining *** modeling the Os isotopic composition of the basalts,an incorporation of10%mafic granulites/amphibolites to the parental magma can successfully explain the initial values of highly radiogenic *** contrast,the unradiogenic and uniform Os isotopic compositions of the Chifeng basalts suggest negligible crustal *** isotopic data acts as an indicator of crustal contamination during magma evolution,providing us a novel insight into the evolution of the intra-continental OIB-like basalts worldwide.