气候变化领域集成服务门户(CCPortal): Alkali magmatism on a carbonaceous chondrite planetesimal

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DOI	10.1073/pnas.1919550117
	Alkali magmatism on a carbonaceous chondrite planetesimal
	Aléon J.; Aléon-Toppani A.; Platevoet B.; Bardintzeff J.-M.; McKeegan K.D.; Brisset F.
发表日期	2020
ISSN	0027-8424
起始页码	8353
结束页码	8359
卷号	117 期号:15
英文摘要	Recent isotopic and paleomagnetic data point to a possible connection between carbonaceous chondrites and differentiated planetary materials, suggesting the existence, perhaps ephemeral, of transitional objects with a layered structure whereby a metal-rich core is enclosed by a silicate mantle, which is itself overlain by a crust containing an outermost layer of primitive solar nebula materials. This idea has not received broad support, mostly because of a lack of samples in the meteoritic record that document incipient melting at the onset of planetary differentiation. Here, we report the discovery and the petrologic-isotopic characterization of UH154-11, a ferroan trachybasalt fragment enclosed in a Renazzo-type carbonaceous chondrite (CR). Its chemical and oxygen isotopic compositions are consistent with very-low-degree partial melting of a Vigarano-type carbonaceous chondrite (CV) from the oxidized subgroup at a depth where fluid-assisted metamorphism enhanced the Na content. Its microdoleritic texture indicates crystallization at an increasing cooling rate, such as would occur during magma ascent through a chondritic crust. This represents direct evidence of magmatic activity in a carbonaceous asteroid on the verge of differentiating and demonstrates that some primitive outer Solar System objects related to icy asteroids and comets underwent a phase of magmatic activity early in the Solar System. With its peculiar petrology, UH154-11 can be considered the long-sought first melt produced during partial differentiation of a carbonaceous chondritic planetary body, bridging a previously persistent gap in differentiation processes from icy cometary bodies to fully melted iron meteorites with isotopic affinities to carbonaceous chondrites. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Alkali magmatism; Early Solar System; Meteorites; O and Mg isotopes; Planetary differentiation
语种	英语
scopus关键词	carbon; isotope; oxygen; silicon dioxide; alkalinity; Article; astronomy; carbonaceous chondrite; chemical analysis; chemical composition; crystallization; magnetism; melting point; microphotography; priority journal; rock; scanning electron microscopy
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/160302
作者单位	Aléon, J., Institut de Minéralogie de Physique des Matériaux et de Cosmochimie, UMR 7590, Sorbonne Université, Museum National d'Histoire Naturelle, CNRS, Université Pierre et Marie Curie, Institut de Recherche Pour le Développement, Paris, 75005, France; Aléon-Toppani, A., Université Paris-Saclay, CNRS, Institut d'Astrophysique Spatiale, Orsay, 91405, France; Platevoet, B., Université Paris-Saclay, Sciences de la Terre Volcanologie-Planétologie, UMR, CNRS 8148 Geosciences Paris Sud, Orsay, F-91405, France; Bardintzeff, J.-M., Université Paris-Saclay, Sciences de la Terre Volcanologie-Planétologie, UMR, CNRS 8148 Geosciences Paris Sud, Orsay, F-91405, France; McKeegan, K.D., Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA 90095-1567, United States; Brisset, F., Université Paris-Saclay, CNRS, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Orsay Cedex, 91405, France
推荐引用方式 GB/T 7714	Aléon J.,Aléon-Toppani A.,Platevoet B.,et al. Alkali magmatism on a carbonaceous chondrite planetesimal[J],2020,117(15).
APA	Aléon J.,Aléon-Toppani A.,Platevoet B.,Bardintzeff J.-M.,McKeegan K.D.,&Brisset F..(2020).Alkali magmatism on a carbonaceous chondrite planetesimal.Proceedings of the National Academy of Sciences of the United States of America,117(15).
MLA	Aléon J.,et al."Alkali magmatism on a carbonaceous chondrite planetesimal".Proceedings of the National Academy of Sciences of the United States of America 117.15(2020).