globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116318
论文题名:
Silicon isotopic compositions of chondrule silicates in carbonaceous chondrites and the formation of primordial solids in the accretion disk
作者: Villeneuve J.; Marrocchi Y.; Jacquet E.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 542
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165326
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Earth and Planetary Science Letters,2020-01-01,542
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