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Contrasting geochemical signatures on land from the Middle and Late Permian extinction events
dc.contributor.authorSheldon, Nathan D.en_US
dc.contributor.authorChakrabarti, Ramanandaen_US
dc.contributor.authorRetallack, Gregory J.en_US
dc.contributor.authorSmith, Roger M. H.en_US
dc.date.accessioned2014-10-07T16:09:55Z
dc.date.availableWITHHELD_13_MONTHSen_US
dc.date.available2014-10-07T16:09:55Z
dc.date.issued2014-10en_US
dc.identifier.citationSheldon, Nathan D.; Chakrabarti, Ramananda; Retallack, Gregory J.; Smith, Roger M. H. (2014). "Contrasting geochemical signatures on land from the Middle and Late Permian extinction events." Sedimentology 61(6): 1812-1829.en_US
dc.identifier.issn0037-0746en_US
dc.identifier.issn1365-3091en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/108696
dc.description.abstractThe end of the Palaeozoic is marked by two mass‐extinction events during the Middle Permian (Capitanian) and the Late Permian (Changhsingian). Given similarities between the two events in geochemical signatures, such as large magnitude negative δ 13 C anomalies, sedimentological signatures such as claystone breccias, and the approximate contemporaneous emplacement of large igneous provinces, many authors have sought a common causal mechanism. Here, a new high‐resolution continental record of the Capitanian event from Portal Mountain, Antarctica, is compared with previously published Changhsingian records of geochemical signatures of weathering intensity and palaeoclimatic change. Geochemical means of discriminating sedimentary provenance (Ti/Al, U/Th and La/Ce ratios) all indicate a common provenance for the Portal Mountain sediments and associated palaeosols, so changes spanning the Capitanian extinction represent changes in weathering intensity rather than sediment source. Proxies for weathering intensity chemical index of alteration, ∆ W and rare earth element accumulation all decline across the Capitanian extinction event at Portal Mountain, which is in contrast to the increased weathering recorded globally at the Late Permian extinction. Furthermore, palaeoclimatic proxies are consistent with unchanging or cooler climatic conditions throughout the Capitanian event, which contrasts with Changhsingian records that all indicate a significant syn‐extinction and post‐extinction series of greenhouse warming events. Although both the Capitanian and Changhsingian event records indicate significant redox shifts, palaeosol geochemistry of the Changhsingian event indicates more reducing conditions, whereas the new Capitanian record of reduced trace metal abundances (Cr, Cu, Ni and Ce) indicates more oxidizing conditions. Taken together, the differences in weathering intensity, redox and the lack of evidence for significant climatic change in the new record suggest that the Capitanian mass extinction was not triggered by dyke injection of coal‐beds, as in the Changhsingian extinction, and may instead have been triggered directly by the Emeishan large igneous province or by the interaction of Emeishan basalts with platform carbonates.en_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.otherGreenhouse Climateen_US
dc.subject.otherMass Extinctionsen_US
dc.subject.otherPalaeoclimateen_US
dc.subject.otherPalaeosolsen_US
dc.subject.otherPalaeozoicen_US
dc.subject.otherAntarcticaen_US
dc.subject.otherWeatheringen_US
dc.titleContrasting geochemical signatures on land from the Middle and Late Permian extinction eventsen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelGeology and Earth Sciencesen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/108696/1/sed12117.pdf
dc.identifier.doi10.1111/sed.12117en_US
dc.identifier.sourceSedimentologyen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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