globalchange  > 气候变化与战略
DOI: 10.1016/j.earscirev.2019.102960
论文题名:
Silicate weathering in anoxic marine sediment as a requirement for authigenic carbonate burial
作者: Torres M.E.; Hong W.-L.; Solomon E.A.; Milliken K.; Kim J.-H.; Sample J.C.; Teichert B.M.A.; Wallmann K.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 200
语种: 英语
中文关键词: Alkalinity ; Authigenic carbonate ; Carbon cycling ; Organogenic dolomite ; Silicate weathering
英文关键词: alkalinity ; authigenesis ; burial diagenesis ; carbon dioxide ; carbonate ; chemical weathering ; dolomite ; marine sediment ; passive margin ; silicate ; slope stability ; subduction zone ; India ; Japan ; Korea
英文摘要: We emphasize the importance of marine silicate weathering (MSiW) reactions in anoxic sediment as fundamental in generating alkalinity and cations needed for carbonate precipitation and preservation along continental margins. We use a model that couples thermodynamics with aqueous geochemistry to show that the CO2 released during methanogenesis results in a drop in pH to 6.0; unless these protons are buffered by MSiW, carbonate minerals will dissolve. We present data from two regions: the India passive margin and the active subduction zone off Japan, where ash and/or rivers supply the reactive silicate phase, as reflected in strontium isotope data. Offshore India and Korea, alteration of continent-derived silicates results in pore water enriched in radiogenic 87Sr, with 87Sr/86Sr ratios as high as 0.7095 and 0.7104, respectively. Off Japan, strontium in pore water influenced by ash alteration is depleted in 87Sr, with 87Sr/86Sr as low as 0.7065. Carbonate minerals formed by alkalinity and cations generated through MSiW carry these strontium isotopic signals, and are typically dolomite, siderite, and Fe-rich calcite. These contrast with the aragonite and high-magnesium calcite that form during anaerobic oxidation of methane and incorporate the coeval seawater 87Sr/86Sr signal. We show that MSiW is necessary for authigenic carbonate formation and preservation along continental margins, which remove carbon from Earth's surface at rates previously estimated to be at least 1012 mol yr−1. In addition, these authigenic carbonates are of relevance to studies of the deep biosphere, fluid flow, seismogenesis, slope stability, and reservoir characteristics. © 2019
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166277
Appears in Collections:气候变化与战略

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作者单位: College of Earth, Ocean and Atmospheric Science, Oregon State University, Corvallis, OR 97331, United States; Geological Survey of Norway, Trondheim, Norway; School of Oceanography, University of Washington, Seattle, WA 98195, United States; Bureau of Economic Geology, University of Texas at Austin, Austin, TX 78713, United States; Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea; School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ 86011, United States; Geologisch-Paläontologisches Institut, Wilhelms-Universität Münster, Corrensstr. 24, Münster, 48149, Germany; IFM-GEOMAR Leibniz Institute of Marine Sciences, Wischhofstrasse 1-3, Kiel, 24148, Germany

Recommended Citation:
Torres M.E.,Hong W.-L.,Solomon E.A.,et al. Silicate weathering in anoxic marine sediment as a requirement for authigenic carbonate burial[J]. Earth Science Reviews,2020-01-01,200
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