| DOI: | 10.1016/j.epsl.2020.116467
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| 论文题名: | CV chondrites: More than one parent body |
| 作者: | Gattacceca J.; Bonal L.; Sonzogni C.; Longerey J.
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| 刊名: | Earth and Planetary Science Letters
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| ISSN: | 0012821X
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| 出版年: | 2020
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| 卷: | 547 | | 语种: | 英语
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| 中文关键词: | carbonaceous chondrites
; chondrite parent bodies
; CV chondrites
; meteorite classification
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| 英文关键词: | Body fluids
; Nickel compounds
; Sulfur compounds
; Carbonaceous chondrites
; Classification scheme
; Current schemes
; Mineralogical features
; Oxygen isotopic composition
; Parent bodies
; Protoliths
; Redox condition
; Meteorites
; carbonaceous chondrite
; chondrule
; isotopic composition
; metasomatism
; mineralogy
; nickel
; oxygen isotope
; parent body
; redox conditions
; sulfide
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| 英文摘要: | CV chondrites are one of the most studied group of carbonaceous chondrites. Based on a number of mineralogical features, they have been divided into three sub-groups: CVOxA, CVOxB, and CVRed. These sub-groups are classically interpreted as coming from a single parent body, with a common protolith affected by significant parent body fluid-assisted metasomatism occurring at different temperatures and/or redox conditions. In this work, we studied a set of 53 CV chondrites. We classified them into the three sub-groups, measured their apparent chondrule sizes and their matrix modal abundance. We measured the triple oxygen isotopic composition for 17 of them. The distributions of chondrule size and matrix abundances in CVOxA and CVOxB cannot be statistically distinguished. Conversely, CVRed and CVOx have distinct distributions. These two robust and simple petrographic indicators combined with the previous knowledge of the peak metamorphic temperatures experienced by these meteorites show that CVOx and CVRed originate from two distinct parent bodies. On the other hand, CVOxA and CVOxB likely originate from the same parent body, with CVOxA representing deeper, more metamorphosed levels. For clarification of the chondrite classification scheme, in which one group should ultimately represent a single parent body, we propose to divide the CV group into two proper groups (and not subgroups as in the current scheme), keeping the names CVRed and CVOx. These two groups can be readily separated by estimating the average nickel content of their sulfides. © 2020 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/164978
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| Appears in Collections: | 气候变化与战略
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作者单位: | CNRS, Aix Marseille Univ, IRD, INRAE, CEREGE, Aix-en-Provence, France; Institut de Planétologie et d'Astrophysique de Grenoble, Université Grenoble Alpes, CNRS, CNES, Grenoble, 38000, France
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| Recommended Citation: | |
Gattacceca J.,Bonal L.,Sonzogni C.,et al. CV chondrites: More than one parent body[J]. Earth and Planetary Science Letters,2020-01-01,547
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