气候变化领域集成服务门户(CCPortal): Silicon isotopic compositions of chondrule silicates in carbonaceous chondrites and the formation of primordial solids in the accretion disk

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DOI	10.1016/j.epsl.2020.116318
	Silicon isotopic compositions of chondrule silicates in carbonaceous chondrites and the formation of primordial solids in the accretion disk
	Villeneuve J.; Marrocchi Y.; Jacquet E.
发表日期	2020
ISSN	0012821X
卷号	542
英文摘要	We determined the silicon isotopic compositions of silicates (olivine and low-Ca pyroxene) in type I and type II chondrules of the carbonaceous chondrites Allende, Kaba, NWA (Northwest Africa) 5958, and MIL (Miller Range) 07342. Type I chondrule silicates show large, mass-dependent Si isotopic fractionations, with δ30Si values ranging from −7‰ to +2.6‰, whereas the δ30Si values of type II chondrule silicates are close to zero and vary by less than 2‰. When present, Mg-rich relict olivine grains in type II chondrules show larger Si variations than their FeO-rich counterparts. In type I chondrules, low-Ca pyroxenes yield systematically lighter δ30Si values than Mg-rich olivines. Our results show that type I chondrules are complex objects whose Si isotopic compositions derived from their precursors and SiO-rich gas-melt interactions. This corroborates that type I chondrules are nebular products that formed under open-system conditions. Our data also suggest that at least some type II chondrules derived from their type I counterparts. Overall, this demonstrates that recycling was common during the evolution of the protoplanetary disk. © 2020 Elsevier B.V.
关键词	carbonaceous chondrites chondrules ion probe silicon isotopes solar system formation
英文关键词	Iron oxides; Isotopes; Magnesium compounds; Meteorites; Olivine; Silicates; Silicon oxides; Accretion disks; Carbonaceous chondrites; Complex objects; FeO-rich; Isotopic composition; Isotopic fractionations; Protoplanetary disks; System conditions; Calcium compounds; chondrite; chondrule; isotopic composition; isotopic fractionation; olivine; silicate; silicon
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202948
作者单位	CRPG, CNRS, Université de Lorraine, UMR 7358, Vandœuvre-lès-Nancy, 54501, France; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Muséum national d'Histoire naturelle, Sorbonne Université, CNRS, CP52, 57 rue Cuvier, Paris, 75005, France
推荐引用方式 GB/T 7714	Villeneuve J.,Marrocchi Y.,Jacquet E.. Silicon isotopic compositions of chondrule silicates in carbonaceous chondrites and the formation of primordial solids in the accretion disk[J],2020,542.
APA	Villeneuve J.,Marrocchi Y.,&Jacquet E..(2020).Silicon isotopic compositions of chondrule silicates in carbonaceous chondrites and the formation of primordial solids in the accretion disk.Earth and Planetary Science Letters,542.
MLA	Villeneuve J.,et al."Silicon isotopic compositions of chondrule silicates in carbonaceous chondrites and the formation of primordial solids in the accretion disk".Earth and Planetary Science Letters 542(2020).