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Shen, Jun; Yin, Runsheng; Zhang, Shuang; Algeo, Thomas J; Bottjer, David J; Yu, Jianxin; Xu, Guozhen; Penman, Donald; Wang, Yongdong; Li, Liqin; Shi, Xiao; Planavsky, Noah J; Feng, Qinglai; Xie, Shucheng
Nature communications, 01/2022, Letnik: 13, Številka: 1Journal Article
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 CO 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.
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