Enhanced continental weathering activity at the onset of the mid-Cenomanian Event (MCE)

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dc.citation.journalTitleGeochemical Perspectives Lettersen_US
dc.citation.volumeNumber23en_US
dc.contributor.authorYobo, L. Nanaen_US
dc.contributor.authorBrandon, A.D.en_US
dc.contributor.authorLauckner, L.M.en_US
dc.contributor.authorEldrett, J.S.en_US
dc.contributor.authorBergman, S.C.en_US
dc.contributor.authorMinisini, D.en_US
dc.date.accessioned2022-12-13T19:11:12Zen_US
dc.date.available2022-12-13T19:11:12Zen_US
dc.date.issued2022en_US
dc.description.abstractThe emplacement of a Large Igneous Province (LIP) is implicated in the triggering of the Cenomanian-Turonian Oceanic Anoxic Event 2 (OAE 2). Evidence for a similar initiation mechanism for the mid-Cenomanian Event (MCE) is unclear. In this study, a reconstruction of mid-Cenomanian seawater 187Os/188Os, the first for the Western Interior Seaway, tests the competing roles of LIP versus continental weathering activity in triggering the MCE. The absence of a prolonged unradiogenic Os isotope excursion (low 187Os/188Os) at the onset of the MCE interval argues against LIP involvement in the event’s initiation. Rather, more radiogenic 187Os/188Os at the onset, that continues to rise to the middle of the MCE, indicates that the event was triggered by increased continental weathering. The combination of decreasing 187Os/188Os from the middle of the MCE onward, coincident with a 40Ar/39Ar age of 96.4 Ma of basalts from Ellesmere Island, Canada, is consistent with High Arctic LIP-related volcanic activity that may have contributed to the end of the MCE. These new data on the MCE thus indicate that LIP activity is not always the trigger for carbon cycle perturbation and associated climate change.en_US
dc.identifier.citationYobo, L. Nana, Brandon, A.D., Lauckner, L.M., et al.. "Enhanced continental weathering activity at the onset of the mid-Cenomanian Event (MCE)." <i>Geochemical Perspectives Letters,</i> 23, (2022) European Association of Geochemistry: https://doi.org/10.7185/geochemlet.2231.en_US
dc.identifier.digitalGPL2231_SIen_US
dc.identifier.doihttps://doi.org/10.7185/geochemlet.2231en_US
dc.identifier.urihttps://hdl.handle.net/1911/114084en_US
dc.language.isoengen_US
dc.publisherEuropean Association of Geochemistryen_US
dc.rightsPublished by the European Association of Geochemistry under Creative Commons License CC BY-NC-ND 4.0en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.titleEnhanced continental weathering activity at the onset of the mid-Cenomanian Event (MCE)en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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