Intensified continental chemical weathering and carbon-cycle perturbations linked to volcanism during the Triassic–Jurassic transition

Jun Shen (), Runsheng Yin, Shuang Zhang, Thomas J. Algeo, David J. Bottjer, Jianxin Yu (), Guozhen Xu, Donald Penman, Yongdong Wang (), Liqin Li, Xiao Shi, Noah J. Planavsky, Qinglai Feng and Shucheng Xie
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Jun Shen: China University of Geosciences
Runsheng Yin: Chinese Academy of Sciences
Shuang Zhang: Texas A&M University
Thomas J. Algeo: China University of Geosciences
David J. Bottjer: University of Southern California
Jianxin Yu: China University of Geosciences
Guozhen Xu: China University of Geosciences
Donald Penman: Utah State University
Yongdong Wang: Chinese Academy of Sciences
Liqin Li: Chinese Academy of Sciences
Xiao Shi: Jilin University, Changchun
Noah J. Planavsky: Yale University
Qinglai Feng: China University of Geosciences
Shucheng Xie: China University of Geosciences

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Direct evidence of intense chemical weathering induced by volcanism is rare in sedimentary successions. Here, we undertake a multiproxy analysis (including organic carbon isotopes, mercury (Hg) concentrations and isotopes, chemical index of alteration (CIA), and clay minerals) of two well-dated Triassic–Jurassic (T–J) boundary sections representing high- and low/middle-paleolatitude sites. Both sections show increasing CIA in association with Hg peaks near the T–J boundary. We interpret these results as reflecting volcanism-induced intensification of continental chemical weathering, which is also supported by negative mass-independent fractionation (MIF) of odd Hg isotopes. The interval of enhanced chemical weathering persisted for ~2 million years, which is consistent with carbon-cycle model results of the time needed to drawdown excess atmospheric CO2 following a carbon release event. Lastly, these data also demonstrate that high-latitude continental settings are more sensitive than low/middle-latitude sites to shifts in weathering intensity during climatic warming events.

Date: 2022
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DOI: 10.1038/s41467-022-27965-x

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