Mg同位素示踪中国东部中生代深部碳循环  

Mg isotope tracing the Mesozoic deep carbon cycle in eastern China

作　　者：段先哲 牛苏娟 李赛 李南 孙浩然 郭聪 肖文舟 隋清霖 冯鹏 贺海洋 DUAN Xianzhe;NIU Sujuan;LI Sai;LI Nan;SUN Haoran;GUO Cong;XIAO Wenzhou;SUI Qinglin;FENG Peng;HE Haiyang(School of Resource&Environment and Safety Engineering,University of South China,Hengyang,Hunan,421001;Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes,Hengyang,Hunan,421001)

机构地区：[1]南华大学资源环境与安全工程学院,湖南衡阳421001 [2]稀有金属矿产开发与废物地质处置技术湖南省重点实验室,湖南衡阳421001

出　　处：《地质论评》2022年第4期1345-1360,共16页Geological Review

基　　金：国家自然科学基金资助项目(编号:42102060,42003028)、创新项目(编号:202110555075);南华大学人才资助项目(编号:2018XQD22)的成果。

摘　　要：地球深部碳循环对全球气候变化、生命探索和岩石圈演化的研究具有重要意义。中国东部岩石圈是地球深部碳循环的重要场所,其减薄和破坏与深部碳循环密切相关。中生代太平洋板块俯冲是制约中国东部岩石圈减薄和破坏的关键,对华北克拉通和华南板块的大规模金属成矿作用具有重要作用。笔者等系统阐述了Mg示踪地球深部碳循环原理,例举了镁同位素示踪中国东部深部碳循环的实例,论述了中生代俯冲的古太平洋板块所释放的碳酸盐熔体/流体与地幔相互作用,是造成中国东部地幔具有普遍的轻Mg同位素组成的重要原因。此外,指出轻镁同位素的多解性,提出多同位素联合示踪是未来研究地球深部碳循环的趋势。The Earth’s deep carbon cycle is of great significance for studying the global climate change,life exploration,and lithospheric evolution.The lithosphere beneath the eastern China is an important place for the deep carbon cycle,and its thinning and destruction are closely related to the deep carbon cycle.The subduction of the Pacific plate in the Mesozoic is the key to the thinning and destruction of the lithosphere in Eastern China,and plays a vital role in the large-scale metal mineralization in North China Craton and South China Block.This paper systematically elucidates the principle of Mg isotope tracing the Earth’s deep carbon cycle,gives an example of the deep carbon cycle in the eastern China,and discusses the interaction of the mantle with the carbonated melts/fluids released from the subducted paleo-Pacific plate during the Mesozoic,which is an important reason accounting for the commonly existed light Mg isotopic composition in the eastern China.Furthermore,the polysolvability of light magnesium isotopes is pointed out and the future trend of studying the Earth’s deep carbon cycle via multi-isotope joint tracing is also proposed.

关 键 词：深部碳循环 中生代 中国东部岩石圈 MG同位素 岩石圈减薄与破坏 古太平洋板块俯冲 

分 类 号：P534.5[天文地球—古生物学与地层学] P597[天文地球—地质学] P618.2