globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.02.058
论文题名:
Redox variations and organic matter accumulation on the Yangtze carbonate platform during Late Ediacaran-Early Cambrian: Constraints from petrology and geochemistry
作者: Gao P.; Liu G.; Jia C.; Young A.; Wang Z.; Wang T.; Zhang P.; Wang D.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 450
起始页码: 91
结束页码: 110
语种: 英语
英文关键词: Black shale ; Ni-mo sulfide ore ; Organic carbon isotopes ; Primary productivity ; South china
英文摘要: In order to understand redox variations and organic matter accumulation on the Yangtze carbonate platform during the Late Ediacaran-Early Cambrian, petrological and geochemical studies of several wells were carried out in this work. Our data suggest that depositional environments were dominated by oxidizing bottom water conditions during the late Ediacaran, and evolved to anoxic conditions, triggered by blooms of microbial organisms in surface waters during the earliest Cambrian. Subsequently, massive release of H2S derived from both anaerobic recycling of organic matter and, probably, hydrothermal venting promoted a sulfidic ocean. The discovery of a Ni-Mo sulfide ore layer in the basal Cambrian implies that such a sulfidic condition spread onto the Yangtze carbonate platform interior during the late Cambrian Stage 2. Further, transgressive flooding led to widespread black shale deposition and persistently anoxic conditions, as indicated by geochemical proxies. During the late Ediacaran to earliest Cambrian, local and widespread phosphogenesis indicates that organic matter accumulation was intimately associated with microbial (especially cyanobacterial) blooms driven by phosphorus cycling. The organic matter accumulations in early Cambrian black shales, however, were in connection with anoxic bottom water conditions and intermittent replenishment of recycled organic phosphorus to surface waters. © 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/68450
Appears in Collections:过去全球变化的重建

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作者单位: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; College of Geosciences, China University of Petroleum, Beijing, China; Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China; Department of Geology, University of Cincinnati, Cincinnati, OH, United States; Petroleum Production and Research Institute of SINOPEC, Beijing, China

Recommended Citation:
Gao P.,Liu G.,Jia C.,et al. Redox variations and organic matter accumulation on the Yangtze carbonate platform during Late Ediacaran-Early Cambrian: Constraints from petrology and geochemistry[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,450
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