globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.03.043
论文题名:
Continental weathering and redox conditions during the early Toarcian Oceanic Anoxic Event in the northwestern Tethys: Insight from the Posidonia Shale section in the Swiss Jura Mountains
作者: Montero-Serrano J.-C.; Föllmi K.B.; Adatte T.; Spangenberg J.E.; Tribovillard N.; Fantasia A.; Suan G.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 429
起始页码: 83
结束页码: 99
语种: 英语
英文关键词: Early toarcian oceanic anoxic event ; Geochemistry ; Mineralogy ; Paleoenvironment ; Posidonia shale ; Switzerland
英文摘要: The geochemistry and mineralogy of organic-rich sediments of the Rietheim succession in northern Switzerland were studied to evaluate the main impacts of the early Toarcian Oceanic Anoxic Event (T-OAE; ~183Ma ago) on the depositional environment in the NW Tethys Ocean. The geochemical data obtained (notably, δ13Corg, δ13CCaCO3, Rock-Eval pyrolysis, TOCcff) support the hypothesis that the negative C-isotope excursion at the onset of the T-OAE mainly reflects a major perturbation in the global carbon cycle rather than local environmental changes (e.g., basinal restriction, productivity). Rock-Eval pyrolysis and δ13Corg-δ15Ntotal crossplots indicate that the organic matter was primarily of marine origin during the T-OAE, and deposited in an epicontinental sea setting. Detrital proxies [notably, detritus index, siliciclastic balance and Ln(Al2O3/Na2O)] suggest that the elevated pCO2 levels and greenhouse climate prevailing during the T-OAE induced significant acceleration of the hydrologic cycle and an increase in continental chemical weathering rates. Redox-sensitive proxies [relative pyrite contents, organic and sulfide balances, V/(V+Ni) ratios, trace elements enrichment factors, trace-element-TOC co-variation patterns and TOC/Ptotal molar ratios] indicate that the Rietheim Posidonia Shale sediments accumulated under oxic-to-dysoxic bottom-water conditions, with more reducing conditions during the T-OAE (anoxic and possibly euxinic). These changes in redox conditions were probably induced by substantial thermohaline stratification driven by enhanced freshwater input and the recurrent influx of brackish Arctic seawater into the NW Tethys through the Viking Corridor, in agreement with previous sedimentological and geochemical evidences from the NW Tethys Ocean. In the studied succession, such conditions were perhaps also responsible for sequestration of most of the regenerated P in the deeper water column by adsorption and/or co-precipitation into authigenic phases. Overall, the major palaeoenvironmental changes documented in this study provide a robust example of Earth's possible responses to the rapid onset of extreme greenhouse conditions. © 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/68925
Appears in Collections:过去全球变化的重建

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作者单位: Institut des sciences de la Terre, Université de Lausanne, Bâtiment Géopolis, Lausanne, Switzerland; Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, 310 allée des Ursulines, Rimouski, QC, Canada; Geotop Research Centre, Université du Québec à Montréal, Montréal, QC, Canada; Institut des dynamiques de la surface terrestre, Université de Lausanne, Bâtiment Géopolis, Lausanne, Switzerland; Laboratoire Géosystèmes, UMR-8217, Université Lille 1, CNRS, Villeneuve d'Ascq, France; UMR CNRS 5276 LGLTPE, Université Lyon 1, Campus de la Doua, Bâtiment Géode, Villeurbanne Cedex, France

Recommended Citation:
Montero-Serrano J.-C.,Föllmi K.B.,Adatte T.,et al. Continental weathering and redox conditions during the early Toarcian Oceanic Anoxic Event in the northwestern Tethys: Insight from the Posidonia Shale section in the Swiss Jura Mountains[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,429
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