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 language | English (US) |
|---|---|
| Pages (from-to) | 327-329 |
| Number of pages | 3 |
| Journal | Nature |
| Volume | 299 |
| Issue number | 5881 |
| DOIs | |
| State | Published - 1982 |
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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 journal › Article
}
TY - JOUR
T1 - An unusual layered mineral in chondrules and aggregates of the Allende carbonaceous chondrite
AU - Tomeoka, Kazushige
AU - Buseck, P R
PY - 1982
Y1 - 1982
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0019910242&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0019910242&partnerID=8YFLogxK
U2 - 10.1038/299327a0
DO - 10.1038/299327a0
M3 - Article
AN - SCOPUS:0019910242
VL - 299
SP - 327
EP - 329
JO - Nature
JF - Nature
SN - 0028-0836
IS - 5881
ER -