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dc.contributor.authorNabbefeld, Birgit
dc.contributor.authorGrice, Kliti
dc.contributor.authorTwitchett, R.
dc.contributor.authorSummons, R
dc.contributor.authorHays, L
dc.contributor.authorBottcher, M
dc.contributor.authorAsif, Muhammad
dc.identifier.citationNabbefeld, Birgit and Grice, Kliti and Twitchett, Richard and Summons, R and Hays, L and Bottcher, M and Asif, M. 2010. An integrated biomarker, isotopic and palaeoenvironmental study through the Late Permian event at Lusitaniadalen, Spitsbergen. Earth and Planetary Science Letters 291: pp. 84-96.

The largest extinction of the Phanerozoic occurred near the Permian/Triassic (P/Tr) boundary some 252 Ma ago. Several scenarios and drivers have been proposed for this event. Here we report for the first time an integrated study comprising sedimentological data, biomarker distributions/abundances and selected stable carbon and hydrogen isotopes along with bulk isotopes (d34Spyrite, d13Ccarb, d13Corg) for a Late Permian section from Lusitaniadalen, Spitsbergen, Norway. Sedimentological and geochemical data support a marine transgression and collapse of the marine ecosystem in the Late Permian. Strong evidence for waxing and waning of photic zone euxinia throughout the Late Permian is provided by Chlorobiaceae-derived biomarkers (including d13C data) and d34Spyrite, implying multiple phases of H2S outgassing and potentially several pulses of extinction. A rapid decrease in abundance of various land-plant biomarkers prior to the marine collapse event indicates a dramatic decline of land-plants during the Late Permian and/or increasing distance from palaeoshoreline as a consequence of sea level rise. Changes in dD of selected biomarkers also suggest a change in source of organic matter (OM) or sea level rise. We also found biomarker and isotopic evidence for a phytoplanktonic bloom triggered by eutrophication as a consequence of the marine collapse. Compound specific isotope analyses (CSIA) of algal and land-plant-derived biomarkers, as well as d13C of carbonate and bulk OM provide strong evidence for synchronous changes in d13C of marine and atmospheric CO2, attributed to a 13C-depleted source. The source could be associated with isotopically depleted methane released from the melting of gas clathrates and/or from respired OM, due to collapse of the marine ecosystem.

dc.publisherElsevier Science BV
dc.subjectsulfur isotopes
dc.subjectphotic zone euxinia
dc.subjecthydrogen isotopes
dc.subjectmethane clathrates
dc.subjectcarbon isotopes
dc.titleAn integrated biomarker, isotopic and palaeoenvironmental study through the Late Permian event at Lusitaniadalen, Spitsbergen
dc.typeJournal Article
dcterms.source.titleEarth and Planetary Science Letters

The journal's homepage is: © 2010 Published by Elsevier B.V.

curtin.accessStatusFulltext not available
curtin.facultyDepartment of Applied Chemistry
curtin.facultyScience and Engineering

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