globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1919550117
论文题名:
Alkali magmatism on a carbonaceous chondrite planetesimal
作者: Aléon J.; Aléon-Toppani A.; Platevoet B.; Bardintzeff J.-M.; McKeegan K.D.; Brisset F.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:15
起始页码: 8353
结束页码: 8359
语种: 英语
英文关键词: Alkali magmatism ; Early Solar System ; Meteorites ; O and Mg isotopes ; Planetary differentiation
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163477
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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

Recommended Citation:
Aléon J.,Aléon-Toppani A.,Platevoet B.,et al. Alkali magmatism on a carbonaceous chondrite planetesimal[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(15)
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