globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12174
Scopus记录号: 2-s2.0-84962773623
论文题名:
A diagenetic control on the Early Triassic Smithian-Spathian carbon isotopic excursions recorded in the marine settings of the Thaynes Group (Utah, USA)
作者: Thomazo C.; Vennin E.; Brayard A.; Bour I.; Mathieu O.; Elmeknassi S.; Olivier N.; Escarguel G.; Bylund K.G.; Jenks J.; Stephen D.A.; Fara E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期:3
起始页码: 220
结束页码: 236
语种: 英语
Scopus关键词: carbon cycle ; carbon isotope ; carbonate ; diagenesis ; isotopic analysis ; isotopic composition ; marine ecosystem ; paleontology ; Phanerozoic ; physicochemical property ; sediment core ; sediment-water interface ; terrestrial ecosystem ; Triassic ; United States ; Utah ; carbon ; carbonic acid derivative ; sea water ; sulfur ; analysis ; carbon cycle ; chemistry ; ecosystem ; paleontology ; sediment ; Utah ; Carbon Cycle ; Carbon Isotopes ; Carbonates ; Ecosystem ; Geologic Sediments ; Paleontology ; Seawater ; Sulfur Isotopes ; Utah
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: In the aftermath of the end-Permian mass extinction, Early Triassic sediments record some of the largest Phanerozoic carbon isotopic excursions. Among them, a global Smithian-negative carbonate carbon isotope excursion has been identified, followed by an abrupt increase across the Smithian-Spathian boundary (SSB; ~250.8 Myr ago). This chemostratigraphic evolution is associated with palaeontological evidence that indicate a major collapse of terrestrial and marine ecosystems during the Late Smithian. It is commonly assumed that Smithian and Spathian isotopic variations are intimately linked to major perturbations in the exogenic carbon reservoir. We present paired carbon isotopes measurements from the Thaynes Group (Utah, USA) to evaluate the extent to which the Early Triassic isotopic perturbations reflect changes in the exogenic carbon cycle. The δ13Ccarb variations obtained here reproduce the known Smithian δ13Ccarb-negative excursion. However, the δ13C signal of the bulk organic matter is invariant across the SSB and variations in the δ34S signal of sedimentary sulphides are interpreted here to reflect the intensity of sediment remobilization. We argue that Middle to Late Smithian δ13Ccarb signal in the shallow marine environments of the Thaynes Group does not reflect secular evolution of the exogenic carbon cycle but rather physicochemical conditions at the sediment-water interface leading to authigenic carbonate formation during early diagenetic processes. © 2016 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85107
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作者单位: UMR CNRS 6282 Biogéosciences, Université de Bourgogne, Franche-Comté, Dijon, France; Laboratoire Magmas et Volcans, Université Blaise Pascal - CNRS - IRD, OPGC, Clermont-Ferrand, France; Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, UMR CNRS 5023, Université Claude Bernard Lyon 1, Villeurbanne Cedex, France; Spanish Fork, UT, United States; West Jordan, UT, United States; Department of Earth Science, Utah Valley University, Orem, UT, United States

Recommended Citation:
Thomazo C.,Vennin E.,Brayard A.,et al. A diagenetic control on the Early Triassic Smithian-Spathian carbon isotopic excursions recorded in the marine settings of the Thaynes Group (Utah, USA)[J]. Geobiology,2016-01-01,14(3)
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