气候变化领域集成服务门户(CCPortal): Early silicic magmatism on a differentiated asteroid Robert

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DOI	10.1038/s41561-022-00996-1
	Early silicic magmatism on a differentiated asteroid Robert
	Nicklas, Robert W.; Day, James M. D.; Gardner-Vandy, Kathryn G.; Udry, Arya
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	696
结束页码	+
卷号	15 期号:9 页码:5
英文摘要	Unlike the other terrestrial planets, Earth has a substantial silica-rich continental crust with a bulk andesitic composition. A small number of meteorites with andesitic bulk compositions have been identified that are thought to be the products of partial melting of chondritic protoliths, a mode of petrogenesis distinct from that of Earth's continental crust. Here we show, using geochemical analyses, that unlike other known andesitic meteorites, Erg Chech 002 has strongly fractionated and low abundances of the highly siderophile elements and mineralogy consistent with origin from a melt. The meteorite's bulk composition, which is similar to terrestrial andesites, cannot be explained by partial melting of basaltic lithologies and instead requires a metal-free chondritic source. We argue that Erg Chech 002 probably formed by similar to 15-25% melting of the mantle of an alkali-undepleted differentiated asteroid. Our findings suggest that extensive silicate differentiation after metal-silicate equilibration of chondritic parent bodies was already occurring within the first 2.25 million years of Solar System history and that andesitic crust formation does not necessarily require plate tectonics.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000836097300005
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272577
作者单位	University of California System; University of California San Diego; Scripps Institution of Oceanography; Oklahoma State University System; Oklahoma State University - Stillwater; Nevada System of Higher Education (NSHE); University of Nevada Las Vegas
推荐引用方式 GB/T 7714	Nicklas, Robert W.,Day, James M. D.,Gardner-Vandy, Kathryn G.,et al. Early silicic magmatism on a differentiated asteroid Robert[J],2022,15(9):5.
APA	Nicklas, Robert W.,Day, James M. D.,Gardner-Vandy, Kathryn G.,&Udry, Arya.(2022).Early silicic magmatism on a differentiated asteroid Robert.NATURE GEOSCIENCE,15(9),5.
MLA	Nicklas, Robert W.,et al."Early silicic magmatism on a differentiated asteroid Robert".NATURE GEOSCIENCE 15.9(2022):5.