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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Continental Thermal Structure and Carbonate Storage of Subducted Sedimentary Origin Control on Different Increases in Atmospheric CO2 in Late Ediacaran and Jurassic

文献类型：期刊论文

作者Wang, Xinxin1; Zhao, Liang1,2; Yang, Jianfeng1,2; Li, Jilei3; Chen, Ling1,2; Sun, Baolu1
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2023-09-28
卷号50期号:18页码:10
关键词deep carbon cycle numerical modeling metamorphic decarbonation sedimentary carbonate atmospheric CO2 CO2 degassing
ISSN号0094-8276
DOI10.1029/2023GL104566
英文摘要Carbon release during continental rifting is thought to regulate atmospheric CO2 levels. Supercontinent dispersal-induced extensional tectonics is similar during the Late Ediacaran and Jurassic, while they exhibit different increases in atmospheric CO2 concentration. The underlying mechanism of distinct CO2 emissions remains to be understood. Here, we conduct petrological-thermomechanical modeling to show that metamorphic decarbonation and melting of carbonates that are derived from subducted sediments are ubiquitous during continental extension. We find that the hotter lithosphere and deeper storage of these carbonates cause more significant amounts of rift-related CO2 release through volcanoes and faults. They may cause similar to 12%-77% larger decarbonation efficiency, providing an efficient driving mechanism for a similar to 31% larger increase in atmospheric CO2 levels during the Late Ediacaran than throughout the Jurassic. The rapid eruption and deposition of recycled carbonatite volcanic ash may contribute to the production of Late Ediacaran marine carbonates with the largest negative delta C-13 (-12 parts per thousand). Plain Language Summary The Late Ediacaran and Jurassic periods witnessed rapid increases in atmospheric CO2 concentration and significant negative carbon isotope excursions in marine carbonates during the Earth's history, but the dynamics of their changes remain enigmatic. In this study, we present high-resolution petrological-thermomechanical models of how these processes occur. Our results indicate that the extensional tectonics drives trans-crustal faulting and thereby results in remobilized subcontinental lithospheric carbonates of subducted sedimentary origin (SLCSS) to melt and migrate upward along these faults. The efficiency of CO2 release from these carbonates via metamorphic reaction decarbonation is promoted by the deeper storage and hotter lithosphere, which can reach up to similar to 12%-77% larger. Recycled carbonatite volcanic ash may rapidly erupt and deposit in shallow marine habitats following the emission of CO2 enriched in C-13, resulting in the formation of large negative delta C-13 in Late Ediacaran and Jurassic. We suggest that metamorphic CO2 degassing of remobilized subcontinental lithospheric mantle carbonates of subducted sedimentary origin (SLMCS) combined with a hotter lithosphere may be responsible for a 31% greater increase in atmospheric CO2 and the largest negative delta C-13 of -12 parts per thousand in the Late Ediacaran.
WOS关键词DEEP CARBON ; EARTHQUAKE SWARMS ; VOLATILES ; TRANSPORT ; GAS ; LITHOSPHERE ; EVOLUTION ; SURFACE ; DIAPIRS ; SYSTEM
资助项目National Natural Science Foundation of China[41888101] ; National Natural Science Foundation of China[42004084] ; IGGCAS Key program[IGGCAS-202201]
WOS研究方向Geology
语种英语
WOS记录号WOS:001067930500001
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; IGGCAS Key program ; IGGCAS Key program ; IGGCAS Key program ; IGGCAS Key program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; IGGCAS Key program ; IGGCAS Key program ; IGGCAS Key program ; IGGCAS Key program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; IGGCAS Key program ; IGGCAS Key program ; IGGCAS Key program ; IGGCAS Key program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; IGGCAS Key program ; IGGCAS Key program ; IGGCAS Key program ; IGGCAS Key program
源URL[http://ir.iggcas.ac.cn/handle/132A11/110807]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Zhao, Liang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Xinxin,Zhao, Liang,Yang, Jianfeng,et al. Continental Thermal Structure and Carbonate Storage of Subducted Sedimentary Origin Control on Different Increases in Atmospheric CO2 in Late Ediacaran and Jurassic[J]. GEOPHYSICAL RESEARCH LETTERS,2023,50(18):10.
APA Wang, Xinxin,Zhao, Liang,Yang, Jianfeng,Li, Jilei,Chen, Ling,&Sun, Baolu.(2023).Continental Thermal Structure and Carbonate Storage of Subducted Sedimentary Origin Control on Different Increases in Atmospheric CO2 in Late Ediacaran and Jurassic.GEOPHYSICAL RESEARCH LETTERS,50(18),10.
MLA Wang, Xinxin,et al."Continental Thermal Structure and Carbonate Storage of Subducted Sedimentary Origin Control on Different Increases in Atmospheric CO2 in Late Ediacaran and Jurassic".GEOPHYSICAL RESEARCH LETTERS 50.18(2023):10.

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来源：地质与地球物理研究所

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