globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12282
Scopus记录号: 2-s2.0-85045613487
论文题名:
What the ~1.4 Ga Xiamaling Formation can and cannot tell us about the mid-Proterozoic ocean
作者: Diamond C.W.; Planavsky N.J.; Wang C.; Lyons T.W.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2018
卷: 16, 期:3
起始页码: 219
结束页码: 236
语种: 英语
英文关键词: molybdenum isotopes ; Paleoredox ; Proterozoic ; redox-sensitive tracemetals
Scopus关键词: air-sea interaction ; anoxic conditions ; biogeochemistry ; concentration (composition) ; geochemistry ; global ocean ; marine environment ; Proterozoic ; redox conditions ; sediment chemistry ; trace element ; China ; North China Block ; Eukaryota
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: Despite a surge of recent work, the evolution of mid-Proterozoic oceanic–atmospheric redox remains heavily debated. Constraining the dynamics of Proterozoic redox evolution is essential to determine the role, if any, that anoxia played in protracting the development of eukaryotic diversity. We present a multiproxy suite of high-resolution geochemical measurements from a drill core capturing the ~1.4 Ga Xiamaling Formation, North China Craton. Specifically, we analyzed major and trace element concentrations, sulfur and molybdenum isotopes, and iron speciation not only to better understand the local redox conditions but also to establish how relevant our data are to understanding the contemporaneous global ocean. Our results suggest that throughout deposition of the Xiamaling Formation, the basin experienced varying degrees of isolation from the global ocean. During deposition of the lower organic-rich shales (130–85 m depth), the basin was extremely restricted, and the reservoirs of sulfate and trace metals were drawn down almost completely. Above a depth of 85 m, shales were deposited in dominantly euxinic waters that more closely resembled a marine system and thus potentially bear signatures of coeval seawater. In the most highly enriched sample from this upper interval, the concentration of molybdenum is 51 ppm with a δ98Mo value of +1.7‰. Concentrations of Mo and other redox-sensitive elements in our samples are consistent with a deep ocean that was largely anoxic on a global scale. Our maximum δ98Mo value, in contrast, is high compared to published mid-Proterozoic data. This high value raises the possibility that the Earth's surface environments were transiently more oxygenated at ~1.4 Ga compared to preceding or postdating times. More broadly, this study demonstrates the importance of integrating all available data when attempting to reconstruct surface O2 dynamics based on rocks of any age. © 2018 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/85009
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作者单位: Department of Earth Sciences, University of California, Riverside, CA, United States; Department of Geology and Geophysics, Yale University, New Haven, CT, United States; State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China

Recommended Citation:
Diamond C.W.,Planavsky N.J.,Wang C.,et al. What the ~1.4 Ga Xiamaling Formation can and cannot tell us about the mid-Proterozoic ocean[J]. Geobiology,2018-01-01,16(3)
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