FeO-rich rims and veins in Allende forsterite - Evidence for high temperature condensation at oxidizing conditions

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Meteoritics; (USA)

DOI:https://doi.org/10.1111/j.1945-5100.1990.tb00983.x· OSTI ID:6576429

Weinbruch, S; Palme, H; Mueller, W F; El Goresy, A ^[1]

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1. Max-Planck-Institut fuer Chemie, Mainz (Germany, F.R.) Darmstadt Technische Hochschule (Germany, F.R.) Max-Planck-Institut fuer Kernphysik, Heidelberg (Germany, F.R.)

This paper presents new data on trace elements in fayalite-rich rims, veins, halos, and matrix olivines in the Allende meteorite. On the basis of new evidence, it is argued that the fayalitic rims were formed by condensation from a gas, and not by thermal equilibration of forsterite with FeO-rich metal or FeO-rich olivine in the interior of a parent body. A similar origin is inferred for fayalitic veins within forsterite crystals. Condensation calculations showed that FeO-rich olivine can be formed by condensation from a gas with enhanced oxygen fugacity. 29 refs.

• OSTI ID: 6576429
• Journal Information: Meteoritics; (USA), Journal Name: Meteoritics; (USA) Vol. 25; ISSN 0026-1114; ISSN MERTA
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHONDRITES
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CRYSTAL STRUCTURE
HIGH TEMPERATURE
IRON COMPOUNDS
IRON OXIDES
IRON SILICATES
MAGNESIUM COMPOUNDS
MAGNESIUM SILICATES
MANGANESE COMPOUNDS
MANGANESE OXIDES
MASS SPECTROSCOPY
METEORITES
MICROSTRUCTURE
MINERALS
OLIVINE
ORIGIN
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RESONANCE IONIZATION MASS SPECTROSCOPY
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SPECTROSCOPY
STONE METEORITES
TRANSITION ELEMENT COMPOUNDS
VAPOR CONDENSATION