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  4. Forsterite-rich accretionary rims around calcium-aluminum-rich inclusions from the reduced CV3 chondrite Efremovka
 
research article

Forsterite-rich accretionary rims around calcium-aluminum-rich inclusions from the reduced CV3 chondrite Efremovka

Ulyanov, A.A.
•
Meibom, A.  
•
Keil, K.
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2001
Meteoritics & Planetary Science

It was suggested that multilayered accretionary rims composed of ferrous olivine, andradite, wollastonite, salite-hedenbergitic pyroxenes, nepheline, and Ni-rich sulfides around Allende calcium aluminum-rich inclusions (CAIs) are aggregates of gas-solid condensates which reflect significant fluctuations in physico-chemical conditions in the slowly cooling solar nebula and grain/gas separation processes. In order to test this model, we studied the mineralogy of accretionary rims around one type A CAI (E104) and one type B CAI (E48) from the reduced CV3 chondrite Efremovka, which is less altered than Allende. In contrast to the Allende accretionary rims, those in Efremovka consist of coarse-grained (20-40 mum), anhedral forsterite (Fa(1-8)), Fe,Ni-metal nodules, amoeboid olivine aggregates (AOAs) and fine-grained CAIs composed of Al-diopside, anorthite, and spinel, +/- forsterite. Although the fine-grained CAIs, AOAs and host CAIs are virtually unaltered, a hibonite-spinel-perovskite CAI in the E48 accretionary rim experienced extensive alteration, which resulted in the formation of Fe-rich, Zn-bearing spinel, and a Ca, Al, Si-hydrous mineral. Forsterites in the accretionary rims typically show an aggregational nature and consist of small olivine grains with numerous pores and tiny inclusions of Al-rich minerals. No evidence for the replacement of forsterite by enstatite was found; no chondrule fragments were identified in the accretionary rims.

  • Details
  • Metrics
Type
research article
DOI
10.1111/j.1945-5100.2001.tb01904.x
Web of Science ID

WOS:000169081300005

Author(s)
Ulyanov, A.A.
Meibom, A.  
Keil, K.
Krot, A.N.
Date Issued

2001

Published in
Meteoritics & Planetary Science
Volume

36

Start page

611

End page

628

Subjects

Allende Meteorite

•

Carbonaceous Chondrites

•

Solar Nebula

•

Dark Inclusions

•

Condensation

•

Metamorphism

•

Abundances

•

Component

•

Systems

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LGB  
Available on Infoscience
May 15, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/80358
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