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TitleMercury evidence of intense volcanism preceded oceanic anoxic event 1d
AuthorYao, H; Chen, X; Yin, R; Grasby, S EORCID logo; Weissert, H; Gu, X; Wang, C
SourceGeophysical Research Letters vol. 48, issue 5, e2020GL091508, 2021 p. 1-10,
Alt SeriesNatural Resources Canada, Contribution Series 20210001
PublisherBlackwell Publishing Ltd.
Mediapaper; on-line; digital
File formatpdf; html
SubjectsScience and Technology; geochemistry; volcanism; mercury
Illustrationsdiagrams; cross-plots; location maps
ProgramGEM2: Geo-mapping for Energy and Minerals Western Arctic, Pearya Terrane, North Ellesmere
Released2021 02 19
AbstractGeochemical studies of marine sediments indicate that most Oceanic Anoxic Events (OAEs) appear coincident with Large Igneous Province (LIP) volcanism. While OAE 1d records peculiar palaeoceanographic changes and global carbon cycle perturbations, however, its association with volcanism has not yet been supported by robust geochemical evidence. To examine the potential role of volcanic we investigated the Hg concentration and isotopic record of OAE 1d interval at the Youxia section, southern Tibet. The interval prior to OAE 1d is marked by a combined positive ?199Hg and Hg content shift, which suggest a volcanic Hg source. These findings are consistence with a prominent increase in sea surface temperatures and atmospheric CO2 before OAE 1d. We suggest the eruption of the central portion of Kerguelen LIP may serve as the main source of Hg anomaly and resulted in global environment perturbations that drove the onset of the anoxia event.
Summary(Plain Language Summary, not published)
This manuscript examines what was the driver of 'ocean anoxic events' and is able to demonstrate using proxies for volcanisms developed by researchers at the Geological Survey of Canada that it was a large igneous province eruption. These events mimic in some ways the impacts of modern climate change on global biogeochemical cycles and can provide insight into earth response to such disruptions.

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