气候变化领域集成服务门户(CCPortal): Constraining crustal silica on ancient Earth

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DOI	10.1073/pnas.2009431117
	Constraining crustal silica on ancient Earth
	Keller C.B.; Harrison T.M.
发表日期	2020
ISSN	0027-8424
起始页码	21101
结束页码	21107
卷号	117 期号:35
英文摘要	Accurately quantifying the composition of continental crust on Hadean and Archean Earth is critical to our understanding of the physiography, tectonics, and climate of our planet at the dawn of life. One longstanding paradigm involves the growth of a relatively mafic planetary crust over the first 1 to 2 billion years of Earth history, implying a lack of modern plate tectonics and a paucity of subaerial crust, and consequently lacking an efficient mechanism to regulate climate. Others have proposed a more uniformitarian view in which Archean and Hadean continents were only slightly more mafic than at present. Apart from complications in assessing early crustal composition introduced by crustal preservation and sampling biases, effects such as the secular cooling of Earth's mantle and the biologically driven oxidation of Earth's atmosphere have not been fully investigated.We find that the former complicates efforts to infer crustal silica from compatible or incompatible element abundances, while the latter undermines estimates of crustal silica content inferred from terrigenous sediments. Accounting for these complications, we find that the data are most parsimoniously explained by a model with nearly constant crustal silica since at least the early Archean. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Archean; Continental crust; Hadean; Plate tectonics
语种	英语
scopus关键词	cerium; chromium; cobalt; copper; magnesium oxide; neodymium; nickel; rubidium; samarium; silicon dioxide; silver; strontium; trace element; zinc; Archean; Article; astronomy; chemical composition; climate; oxidation; parsimony analysis; priority journal; quantitative analysis; rock
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160828
作者单位	Keller, C.B., Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, United States; Harrison, T.M., Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA 90095, United States
推荐引用方式 GB/T 7714	Keller C.B.,Harrison T.M.. Constraining crustal silica on ancient Earth[J],2020,117(35).
APA	Keller C.B.,&Harrison T.M..(2020).Constraining crustal silica on ancient Earth.Proceedings of the National Academy of Sciences of the United States of America,117(35).
MLA	Keller C.B.,et al."Constraining crustal silica on ancient Earth".Proceedings of the National Academy of Sciences of the United States of America 117.35(2020).