globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12197
Scopus记录号: 2-s2.0-84978386169
论文题名:
A new model of the formation of Pennsylvanian iron carbonate concretions hosting exceptional soft-bodied fossils in Mazon Creek, Illinois
作者: Cotroneo S.; Schiffbauer J.D.; McCoy V.E.; Wortmann U.G.; Darroch S.A.F.; Peng Y.; Laflamme M.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期:6
起始页码: 543
结束页码: 555
语种: 英语
Scopus关键词: bicarbonate ; cementation ; fossil ; freshwater environment ; iron ; isotopic analysis ; marine environment ; Pennsylvanian ; pyrite ; siderite ; sulfate-reducing bacterium ; terrestrial environment ; Illinois ; Illinois ; Mazon Creek ; United States ; carbonic acid derivative ; iron ; animal ; biological model ; chemistry ; fossil ; Illinois ; invertebrate ; sediment ; Animals ; Carbonates ; Fossils ; Geologic Sediments ; Illinois ; Invertebrates ; Iron ; Models, Biological
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: Preservation of Pennsylvanian-aged (307 Ma) soft-bodied fossils from Mazon Creek, Illinois, USA, is attributed to the formation of siderite concretions, which encapsulate the remains of terrestrial, freshwater, and marine flora and fauna. The narrow range of positive δ34S values from pyrite in individual concretions suggests microenvironmentally limited ambient sulfate, which may have been rapidly exhausted by sulfate-reducing bacteria. Tissue of the decaying carcass was rapidly encased by early diagenetic pyrite and siderite produced within the sulfate reduction and methanogenic zones of the sediment, with continuation of the latter resulting in concretion cementation. Cross-sectional isotopic analyses (δ13C and δ18O) and mineralogical characterization of the concretions point to initiation of preservation in high porosity proto-concretions during the early phases of microbially induced decay. The proto-concretion was cemented prior to compaction of the sediments by siderite as a result of methanogenic production of 13C-rich bicarbonate—which varies both between Essex and Braidwood concretions and between fossiliferous and unfossiliferous concretions. This work provides the first detailed geochemical study of the Mazon Creek siderite concretions and identifies the range of conditions allowing for exceptional soft-tissue fossil formation as seen at Mazon Creek. © 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/85088
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Earth Sciences, University of Toronto, Toronto, ON, Canada; Department of Geological Sciences, University of Missouri, Columbia, MO, United States; Department of Geology and Geophysics, Yale University, New Haven, CT, United States; Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN, United States; Department of Geology & Geophysics, Louisiana State University, Baton Rouge, LA, United States; Department of Chemical and Physical Sciences, University of Toronto Mississauga, Mississauga, ON, Canada; Department of Earth Sciences, University of Ottawa, Ottawa, ON, Canada

Recommended Citation:
Cotroneo S.,Schiffbauer J.D.,McCoy V.E.,et al. A new model of the formation of Pennsylvanian iron carbonate concretions hosting exceptional soft-bodied fossils in Mazon Creek, Illinois[J]. Geobiology,2016-01-01,14(6)
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