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Active methanogenesis during the melting of Marinoan snowball Earth TEXT SIZE: A A A
Geological evidence indicates that the deglaciation of Marinoan snowball Earth ice age (similar to 635Myr ago) was associated with intense continental weathering, recovery of primary productivity, transient marine euxinia, and potentially extensive CH4 emission. It is proposed that the deglacial CH4 emissions may have provided positive feedbacks for ice melting and global warming. However, the origin of CH4 remains unclear. Here we report Ni isotopes (delta Ni-60) and Yttrium-rare earth element (YREE) compositions of syndepositional pyrites from the upper most Nantuo Formation (equivalent deposits of the Marinoan glaciation), South China. The Nantuo pyrite displays anti-correlations between Ni concentration and delta Ni-60, and between Ni concentration and Sm/Yb ratio, suggesting mixing between Ni in seawater and Ni from methanogens. Our study indicates active methanogenesis during the termination of Marinoan snowball Earth. This suggests that methanogenesis was fueled by methyl sulfides produced in sulfidic seawater during the deglacial recovery of marine primary productivity.
 

Publication name

 NATURE COMMUNICATIONS Volume: 12 Issue: 1 Article Number: 955 DOI: 10.1038/s41467-021-21114-6 Published: FEB 11 2021

Author(s)

 Zhao, Zhouqiao; Shen, Bing; Zhu, Jian-Ming; Lang, Xianguo; Wu, Guangliang; Tan, Decan; Pei, Haoxiang; Huang, Tianzheng; Ning, Meng; Ma, Haoran

Corresponding author(s) 

 SHEN Bing 
 bingshen@pku.edu.cn
 -Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, MOE, Beijing, Peoples R China. 
 ZHU Jianming
 jmzhu@cugb.edu.cn  
 -China Univ Geosci, Inst Earth Sci, State Key Lab Geol Proc & Mineral Resources, Beijing, Peoples R China.
 LANG Xianguo
 langxianguo19@cdut.edu.cn  
 -Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu, Peoples R China.
 -Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu, Peoples R China.

Author(s) from IGCAS   TAN Decan

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