globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.03.010
论文题名:
An integrated carbon isotope record of an end-Permian crater lake above a phreatomagmatic pipe of the Siberian Traps
作者: Fristad K.E.; Pedentchouk N.; Roscher M.; Polozov A.; Svensen H.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 428
起始页码: 39
结束页码: 49
语种: 英语
英文关键词: Breccia pipe ; Carbon isotope excursion ; End-Permian mass extinction ; Hydrothermal system ; Siberian traps ; Volcanic crater lake
英文摘要: The largest mass extinction in Earth history occurred at the end-Permian (~252millionyears ago) and is marked by a global negative carbon isotope excursion and the onset of Siberian Trap volcanism, prompting diverse hypotheses on the link between flood basalt volcanism, carbon cycle perturbations, and mass extinction. Phreatomagmatic pipes associated with Siberian Trap volcanism have been proposed as conduits for the release of 12C-enriched carbon gases from thermogenic and/or magmatic sources to the end-Permian atmosphere. Some of the pipes have preserved crater-lake sediments of volcaniclastic origin. This study examined the preserved evidence for 12C-enriched carbon release into the Western Oktyabrsk crater in east Siberia from the underlying volcanic basin. We find that the 13C/12C ratio of the carbonate cement, organic matter, and long-chain n-alkanes in the lacustrine crater sediments support the hypothesis that 12C-enriched carbon infiltrated the basal crater sediments and lake water immediately after crater formation. The values and trends of δ13CCarb, δ13CTOC, and δ13Cn-alkanes in the crater sediments are consistent with 12C-enriched carbon with isotopic values similar to that of carbon sourced from thermogenic and/or 12C-enriched magmatic sources. This implies that carbon release through the pipes in the Tunguska Basin may explain the source of the global negative carbon isotope perturbations, and their coincidence with Siberian Trap volcanism, at the end-Permian. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68941
Appears in Collections:过去全球变化的重建

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作者单位: Physics of Geological Processes (PGP), University of Oslo, PO Box 1048 Blindern, Oslo, Norway; School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, United Kingdom; Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Norway; Institute of Geology of Ore Deposits, Petrography Mineralogy and Geochemistry, Russian Academy of Sciences, Moscow, Russian Federation; Beak Consultants GmbH, Am St. Niclas Schacht 13, Freiberg, Germany

Recommended Citation:
Fristad K.E.,Pedentchouk N.,Roscher M.,et al. An integrated carbon isotope record of an end-Permian crater lake above a phreatomagmatic pipe of the Siberian Traps[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,428
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