22 Citations (Scopus)

Abstract

Olivine-rich chondrules and aggregates in the Allende C3(V) carbonaceous chondrite are characterized by abundant opaque spherules of metal, sulphide and magnetite grains. This assemblage has been explained as resulting from the crystallization of immiscible metal-sulphide-oxide liquids, suspended as droplets within the chondrules1. Petrographic evidence indicates a significant metasomatic effect in a highly oxidizing condition in a later cooled stage2,3. We have found that an unusual Fe-, Ni-and O-rich layered mineral, related to serpentine, occurs within the opaque assemblage; it is formed by alteration of olivine. The textural and compositional features are clearly distinct from terrestrial phyllosilicates. This is the first report of a serpentine-related mineral in the Allende meteorite. Our observations suggest that aqueous conditions occurred in Allende before the final stage of meteorite formation.

Original languageEnglish (US)
Pages (from-to)327-329
Number of pages3
JournalNature
Volume299
Issue number5881
DOIs
StatePublished - 1982

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chondrule
carbonaceous chondrite
olivine
sulfide
Allende meteorite
spherule
metal
phyllosilicate
mineral
meteorite
droplet
magnetite
crystallization
oxide
liquid
effect

ASJC Scopus subject areas

  • General

Cite this

An unusual layered mineral in chondrules and aggregates of the Allende carbonaceous chondrite. / Tomeoka, Kazushige; Buseck, P R.

In: Nature, Vol. 299, No. 5881, 1982, p. 327-329.

Research output: Contribution to journalArticle

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