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DOI	10.1126/science.aan8086
	Titanium isotopic evidence for felsic crust and plate tectonics 3.5 billion years ago
	Greber N.D.; Dauphas N.; Bekker A.; Ptáček M.P.; Bindeman I.N.; Hofmann A.
发表日期	2017
ISSN	0036-8075
起始页码	1271
结束页码	1274
卷号	357 期号:6357
英文摘要	Earth exhibits a dichotomy in elevation and chemical composition between the continents and ocean floor. Reconstructing when this dichotomy arose is important for understanding when plate tectonics started and how the supply of nutrients to the oceans changed through time. We measured the titanium isotopic composition of shales to constrain the chemical composition of the continental crust exposed to weathering and found that shales of all ages have a uniform isotopic composition. This can only be explained if the emerged crust was predominantly felsic (silica-rich) since 3.5 billion years ago, requiring an early initiation of plate tectonics. We also observed a change in the abundance of biologically important nutrients phosphorus and nickel across the Archean-Proterozoic boundary, which might have helped trigger the rise in atmospheric oxygen. © 2017, American Association for the Advancement of Science. All rights reserved.
英文关键词	isotope; nickel; oxygen; phosphorus; silicon dioxide; titanium; Archean; chemical weathering; continental crust; felsic rock; isotopic analysis; isotopic composition; Proterozoic; reconstruction; shale; titanium; Archean; Article; chemical composition; geology; priority journal; Proterozoic; rock; sediment; weathering
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243864
作者单位	Origins Laboratory, Department of the Geophysical Sciences, Enrico Fermi Institute, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60615, United States; Department of Earth Sciences, University of California, Riverside, CA 92521, United States; Department of Geology, University of Johannesburg, Post Office Box 524, Auckland Park, 2006, South Africa; Department of Geological Sciences, 1272 University of Oregon, Eugene, OR 97403, United States; Department of Earth Sciences, University of Geneva, Rue des Maraîchers 13, Geneva, 1205, Switzerland
推荐引用方式 GB/T 7714	Greber N.D.,Dauphas N.,Bekker A.,et al. Titanium isotopic evidence for felsic crust and plate tectonics 3.5 billion years ago[J],2017,357(6357).
APA	Greber N.D.,Dauphas N.,Bekker A.,Ptáček M.P.,Bindeman I.N.,&Hofmann A..(2017).Titanium isotopic evidence for felsic crust and plate tectonics 3.5 billion years ago.Science,357(6357).
MLA	Greber N.D.,et al."Titanium isotopic evidence for felsic crust and plate tectonics 3.5 billion years ago".Science 357.6357(2017).