globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116583
论文题名:
Uranium isotope evidence for Mesoarchean biological oxygen production in shallow marine and continental settings
作者: Wang X.; Ossa Ossa F.; Hofmann A.; Agangi A.; Paprika D.; Planavsky N.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 551
语种: 英语
中文关键词: Archean ; oxygen ; paleoredox proxy ; photosynthesis ; uranium isotopes
英文关键词: Iron oxides ; Isotopes ; Manganese removal (water treatment) ; Oxygen ; Seawater ; Silicates ; Bulk silicate earth ; Earth's surface ; Isotope fractionation ; Oxidative weathering ; Oxygen production ; Redox sensitives ; Sediment water interface ; Uranium isotopes ; Weathering ; Archean ; continental margin ; depositional environment ; marine environment ; oxygen ; paleoenvironment ; photosynthesis ; redox conditions ; shallow water ; uranium isotope ; Kaapvaal Craton
英文摘要: Oxidative weathering of continental rocks is the major source of redox-sensitive elements to the ocean. The timing for the initiation of oxidative weathering remains strongly debated. Here we report new δ238U data for the authigenic component of well-preserved ca. 3.07–2.90 Ga marine and lacustrine shales from the Mozaan and Dominion groups of the Kaapvaal Craton, South Africa. The δ238Uauth values in marine shales (−0.71‰ to −0.21‰ relative to CRM 112a) are lower than the bulk silicate Earth (BSE, −0.40‰ to −0.17‰), while those of lacustrine shales (−0.68‰ to 0.05‰) scatter above and below the BSE range. In addition, the δ238Uauth values of marine shales deposited in shallow seawater are significantly lower than those of the shales deposited in deep seawater. We propose that U(VI) was adsorbed onto Fe-Mn oxides in oxic shallow water and then shuttled to the seafloor. The U isotope fractionations in lacustrine shales are best explained by reduction of U(VI) to U(IV) below the sediment-water interface. Together, these observations bolster the case that a mildly oxidative weathering regime had been established at the Earth's surface by ∼3.0 Ga, paving the way to the onset of aerobic metabolism in both continental and shallow marine environments. © 2020 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/165338
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作者单位: University of South Alabama, Mobile, AL, United States; Dauphin Island Sea Lab, Dauphin Island, AL, United States; University of Tuebingen, Tuebingen, 72074, Germany; University of Johannesburg, Auckland Park, 2006, South Africa; Akita University, Tegata Gakuen machi010-8502, Japan; Yale University, New Haven, CT, United States

Recommended Citation:
Wang X.,Ossa Ossa F.,Hofmann A.,et al. Uranium isotope evidence for Mesoarchean biological oxygen production in shallow marine and continental settings[J]. Earth and Planetary Science Letters,2020-01-01,551
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