气候变化领域集成服务门户(CCPortal): 10Be/9Be Ratios Reveal Marine Authigenic Clay Formation

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DOI	10.1029/2019GL086061
	10Be/9Be Ratios Reveal Marine Authigenic Clay Formation
	Bernhardt A.; Oelze M.; Bouchez J.; von Blanckenburg F.; Mohtadi M.; Christl M.; Wittmann H.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	As reverse weathering has been shown to impact long-term changes in atmospheric CO2 levels, it is crucial to develop quantitative tools to reconstruct marine authigenic clay formation. We explored the potential of the beryllium (Be) isotope ratio (10Be/9Be) recorded in marine clay-sized sediment to track neoformation of authigenic clays. The power of such proxy relies on the orders-of-magnitude difference in 10Be/9Be ratios between continental Be and Be dissolved in seawater. On marine sediments collected along a Chilean margin transect we chemically extracted reactive phases and separated the clay-sized fraction to compare the riverine and marine 10Be/9Be ratio of this fraction. 10Be/9Be ratios increase fourfold from riverine to marine sediment. We attribute this increase to the incorporation of Be high in 10Be/9Be from dissolved biogenic opal, which also serves as a Si-source for the precipitation of marine authigenic clays. 10Be/9Be ratios thus sensitively track reverse-weathering reactions forming marine authigenic clays. ©2020. The Authors.
英文关键词	Beryllium; Isotopes; Submarine geology; Weathering; 10Be; Authigenic clays; Clay-sized fractions; Cosmogenic nuclides; denudation; Long term change; Orders of magnitude; Quantitative tool; Sediments; beryllium isotope; carbon dioxide; chemical weathering; fluvial deposit; marine sediment; precipitation (chemistry); seawater; sediment chemistry; Chilean Margin; Pacific Ocean
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170723
作者单位	Institute of Geological Sciences, Freie Universitaet Berlin, Berlin, Germany; GFZ German Research Centre for Geosciences, Inorganic and Isotope Geochemistry, Potsdam, Germany; Institut de physique du globe de Paris, Université de Paris, CNRS, Paris, France; GFZ German Research Centre for Geosciences, Earth Surface Geochemistry, Potsdam, Germany; MARUM-Center for Marine Environmental Sciences, Bremen University, Bremen, Germany; Laboratory of Ion Beam Physics, Department of Physics, ETH Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Bernhardt A.,Oelze M.,Bouchez J.,et al. 10Be/9Be Ratios Reveal Marine Authigenic Clay Formation[J],2020,47(4).
APA	Bernhardt A..,Oelze M..,Bouchez J..,von Blanckenburg F..,Mohtadi M..,...&Wittmann H..(2020).10Be/9Be Ratios Reveal Marine Authigenic Clay Formation.Geophysical Research Letters,47(4).
MLA	Bernhardt A.,et al."10Be/9Be Ratios Reveal Marine Authigenic Clay Formation".Geophysical Research Letters 47.4(2020).