Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): Implications for palaeoenvironmental changes

Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): Implications for palaeoenvironmental changes

The Permian-Triassic boundary is marked by a globally prominent negative carbon isotope excursion traceable in marine carbonates and organic matter. In the shallow marine carbonate succession at Seis/Siusi (Dolomites, Italy), the &delta;<sup>13</sup>C<sub>carb</sub> and &...

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Main Authors: S. Siegert, S. H. Kraus, W. Mette, U. Struck, C. Korte
Format: Article
Language:English
Published: Copernicus Publications 2011-08-01
Series:Fossil Record
Online Access:http://www.foss-rec.net/14/207/2011/fr-14-207-2011.pdf
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spelling doaj-d0b84bf937c6461a8acd0b1c61bb9d8e2020-11-24T21:12:09ZengCopernicus PublicationsFossil Record2193-00662193-00742011-08-0114220721710.5194/fr-14-207-2011Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): Implications for palaeoenvironmental changesS. Siegert0S. H. Kraus1W. Mette2U. Struck3C. Korte4Institut für Geologische Wissenschaften, Freie Universität Berlin, Malteserstr. 74–100, 12249 Berlin, GermanyInstitut für Geologische Wissenschaften, Freie Universität Berlin, Malteserstr. 74–100, 12249 Berlin, GermanyInstitut für Geologie und Paläontologie, Universität Innsbruck, Innrain 52, 6020 Innsbruck, AustriaMuseum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung an der Humboldt-Universität zu Berlin, 10115 Berlin, GermanyDepartment of Geography and Geology, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen K, DenmarkThe Permian-Triassic boundary is marked by a globally prominent negative carbon isotope excursion traceable in marine carbonates and organic matter. In the shallow marine carbonate succession at Seis/Siusi (Dolomites, Italy), the &delta;<sup>13</sup>C<sub>carb</sub> and &delta;<sup>13</sup>C<sub>org</sub> signatures follow the general Permian-Triassic boundary carbon isotope trend, but the &delta;<sup>13</sup>C<sub>org</sub> values are slightly less depleted in <sup>13</sup>C in two episodes representing restricted lagoonal environments and in the period around the Tesero Oolite Horizon. This isotopically less depleted organic matter in the lagoons is interpreted to be most likely caused by poor oxygen ventilation and/or slightly modified salinity which may have led to restricted bioproductivity and increased hence the relative amounts of continental-sourced organic matter. In addition, elevated riverine influx and supply of terrestrial organic matter, perhaps triggered by a wet period, might be the cause for the relatively less depleted <sup>13</sup>C in the organic matter around the Tesero Oolite Horizon and in overlying sediments. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.201100008" target="_blank">10.1002/mmng.201100008</a>http://www.foss-rec.net/14/207/2011/fr-14-207-2011.pdf
collection DOAJ
language English
format Article
sources DOAJ
author S. Siegert
S. H. Kraus
W. Mette
U. Struck
C. Korte
spellingShingle S. Siegert
S. H. Kraus
W. Mette
U. Struck
C. Korte
Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): Implications for palaeoenvironmental changes
Fossil Record
author_facet S. Siegert
S. H. Kraus
W. Mette
U. Struck
C. Korte
author_sort S. Siegert
title Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): Implications for palaeoenvironmental changes
title_short Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): Implications for palaeoenvironmental changes
title_full Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): Implications for palaeoenvironmental changes
title_fullStr Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): Implications for palaeoenvironmental changes
title_full_unstemmed Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): Implications for palaeoenvironmental changes
title_sort organic carbon isotope values from the late permian seis/siusi succession (dolomites, italy): implications for palaeoenvironmental changes
publisher Copernicus Publications
series Fossil Record
issn 2193-0066
2193-0074
publishDate 2011-08-01
description The Permian-Triassic boundary is marked by a globally prominent negative carbon isotope excursion traceable in marine carbonates and organic matter. In the shallow marine carbonate succession at Seis/Siusi (Dolomites, Italy), the &delta;<sup>13</sup>C<sub>carb</sub> and &delta;<sup>13</sup>C<sub>org</sub> signatures follow the general Permian-Triassic boundary carbon isotope trend, but the &delta;<sup>13</sup>C<sub>org</sub> values are slightly less depleted in <sup>13</sup>C in two episodes representing restricted lagoonal environments and in the period around the Tesero Oolite Horizon. This isotopically less depleted organic matter in the lagoons is interpreted to be most likely caused by poor oxygen ventilation and/or slightly modified salinity which may have led to restricted bioproductivity and increased hence the relative amounts of continental-sourced organic matter. In addition, elevated riverine influx and supply of terrestrial organic matter, perhaps triggered by a wet period, might be the cause for the relatively less depleted <sup>13</sup>C in the organic matter around the Tesero Oolite Horizon and in overlying sediments. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.201100008" target="_blank">10.1002/mmng.201100008</a>
url http://www.foss-rec.net/14/207/2011/fr-14-207-2011.pdf
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