摘要
本文总结评述了西太平洋板块深俯冲及在东亚地幔过渡带滞留和与之相关的晚白垩世和新生代东亚板内玄武岩共同构成的大地幔楔板内深部碳循环圈存在的证据;探讨了大地幔楔板内碳循环圈与岛弧系统碳循环圈在地幔碳酸盐化交代介质、碳酸盐种属、氧化还原反应及碳酸盐化地幔部分熔融发生机制等方面的差异和对显生宙大气氧含量保持稳定及温室效应周期性变化的影响;并指出了定量估计深俯冲碳酸盐歧化反应还原成金刚石而留在地幔过渡带和通过板内玄武质火山返还大气的碳各自所占有比例应是未来需研究的重要课题。
In this paper we summarize the evidence for the deep carbon cycling in a big mantle wedge composed of the deeply subducted Western Pacific Plate in the mantle transition zone and the exposed Late Cretaceous and Cenozoic intraplate basalts.We explore the differences in the carbon cycle between the big mantle wedge and island arc systems regarding metasomatic agents,carbonate species,redox reactions and mechanisms of partial melting of carbonated mantle,as well as their effects on maintaining a stable oxygen level in the Phanerozoic atmosphere and on the periodic changes in the greenhouse effect.We point out that quantitative estimate of the proportion of carbon left in the mantle transition zone through reduction of deep subducted carbonates into diamond,and carbon returned to the atmosphere through intraplate basaltic volcanoes,is an important topic for future study.
作者
李曙光
汪洋
刘盛遨
LI Shuguang;WANG Yang;LIU Sheng’ao(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences(Beijing),Beijing 100083,China;CAS Key Laboratory of Crust-Mantle Materials and Environments,University of Science and Technology of China,Hefei 230026,China)
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2024年第1期15-27,共13页
Earth Science Frontiers
基金
科学技术部国家重点研发计划项目(2019YFA0708400)
中国地质大学(北京)深时数字地球前沿科学中心项目(590623005)
国家自然科学基金重点项目(41730214)。
关键词
岛弧碳循环圈
板内碳循环圈
大地幔楔
宜居气候
island arc carbon cycling
intraplate carbon cycling
big mantle wedge
habitable climates
