Linking deep CO_(2) outgassing to cratonic destruction  

作　　者：Zhao-Xue Wang Sheng-Ao Liu Shuguang Li Di Liu Jingao Liu 

机构地区：[1]State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China

出　　处：《National Science Review》2022年第6期7-17,共11页国家科学评论（英文版）

基　　金：supported by the National Key Research and Development Program of China (2019YFA0708400);the National Natural Science Foundation of China (41730214 and 41688103);the ‘Strategic Priority Research Program’ of the Chinese Academy of Sciences (XDB18000000 to S.-A.L. and S.G.L.)。

摘　　要：Outgassing of carbon dioxide from the Earth's interior regulates the surface climate through deep time.Here we examine the role of cratonic destruction in mantle CO_(2) outgassing via collating and presenting new data for Paleozoic kimberlites,Mesozoic basaltic rocks and their mantle xenoliths from the eastern North China Craton(NCC),which underwent extensive destruction in the early Cretaceous.High Ca/Al and low Ti/Eu and δ26Mg are widely observed in lamprophyres and mantle xenoliths,which demonstrates that the cratonic lithospheric mantle(CLM)was pervasively metasomatized by recycled carbonates.Raman analysis of bubble-bearing melt inclusions shows that redox melting of the C-rich CLM produced carbonated silicate melts with high CO_(2) content.The enormous quantities of CO_(2) in these magmas,together with substantial CO_(2) degassing from the carbonated melt–CLM reaction and crustal heating,indicate that destruction of the eastern NCC resulted in rapid and extensive mantle CO_(2) emission,which partly contributed to the early Cretaceous greenhouse climate episode.

关 键 词：carbonate metasomatism lithospheric mantle CO_(2)outgassing deep carbon cycling cratonic destruction North China Craton 

分 类 号：P532[天文地球—古生物学与地层学] P542[天文地球—地质学]