globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.08.015
论文题名:
Redox-dependent distribution of early macro-organisms: Evidence from the terminal Ediacaran Khatyspyt Formation in Arctic Siberia
作者: Cui H.; Grazhdankin D.V.; Xiao S.; Peek S.; Rogov V.I.; Bykova N.V.; Sievers N.E.; Liu X.-M.; Kaufman A.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 461
起始页码: 122
结束页码: 139
语种: 英语
英文关键词: Carbon and sulfur cycles ; Chemostratigraphy ; Early macro-organism distribution ; Oceanic euxinia ; Redox condition ; Superheavy pyrite
英文摘要: The Ediacaran Period witnessed the first appearance of macroscopic animal life in Earth's history. However, the biogeochemical context for the stratigraphic occurrence of early metazoans is largely uncertain, in part due to the dearth of integrated paleobiological and chemostratigraphic datasets. In this study, a comprehensive geochemical analysis was conducted on the fossiliferous Khatyspyt Formation in Arctic Siberia, in order to gain insights into the Ediacaran paleoenvironments. This study was designed to specifically address the relationship between paleoredox conditions and Ediacaran fossil occurrences in the Khatyspyt Formation. Our data reveal a dramatic shift in pyrite sulfur isotope compositions (δ34Spyrite) from ca. − 20‰ to ca. 55‰, and this shift is intriguingly associated with the first occurrence of Ediacara-type macrofossils at the studied section, suggesting a possible link between seawater redox conditions and distribution of early macroscopic organisms. Based on multiple lines of sedimentological and geochemical evidence, we propose that the development of oceanic euxinia — which may be widespread in the continental margins due to enhanced oxidative weathering in the terminal Ediacaran Period — may have locally prohibited the colonization of Ediacara-type organisms and resulted in low δ34Spyrite values in the lower Khatyspyt Formation. In the middle and upper Khatyspyt Formation, progressive secular transition from euxinic to non-euxinic and more habitable conditions may have allowed for the colonization of Ediacara-type and other macro-organisms. © 2016 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/68238
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geoscience and NASA Astrobiology Institute, University of Wisconsin–Madison, Madison, WI, United States; Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College ParkMD, United States; Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch Russian Academy of Sciences, Novosibirsk, Russian Federation; Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk, Russian Federation; Department of Geosciences, Virginia Tech, Blacksburg, VA, United States; Department of Geological Sciences, University of North Carolina, Chapel Hill, NC, United States; United States Geological Survey, Menlo Park, CA, United States; Department of Geological Sciences, School of Earth, Energy & Environmental Sciences, Stanford UniversityCA, United States

Recommended Citation:
Cui H.,Grazhdankin D.V.,Xiao S.,et al. Redox-dependent distribution of early macro-organisms: Evidence from the terminal Ediacaran Khatyspyt Formation in Arctic Siberia[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,461
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