Cathodoluminescence zoning and minor elements in forsterites from the Murchison (C2) and Allende (C3V) carbonaceous chondrites

Details Cathodoluminescence zoning and minor elements in forsterites from the Murchison (C2) and Allende (C3V) carbonaceous chondrites Cathodoluminescence zoning and minor elements in forsterites from the Murchison (C2) and Allende (C3V) carbonaceous chondrites

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.313..294s&link_type=abstract

Nature (ISSN 0028-0836), vol. 313, Jan. 24, 1985, p. 294-297.

Computer Science

20

Carbonaceous Chondrites, Cathodoluminescence, Meteoritic Composition, Trace Elements, Allende Meteorite, Electron Microscopy, Metal Oxides, Murchison Meteorite, Olivine, Meteorites, Cathodoluminescence, Zoning, Minor Elements, Forsterites, Murchison, Allende, Carbonaceous Chondrites, C Chondrites, Olivine, C3V Chondrites, Texture, Techniques, Origin, Vapor, Liquids, Grains, Description, Electron Microprobe Analysis, Abundance, Aluminum, Titanium, Calcium, Formation, Features, Crystallization, Temperature, H

Scientific paper

Cathodoluminescence has been applied to look for textural features of olivine in carbonaceous meteorites relevant to the unresolved dispute over the origin of the olivine, whether from a vapor or a liquid. Cathodoluminescence photographs of forsterite grains in Murchison (C2) and Allende (C3) meteorites presented here reveal a blue core with planar boundaries to a red or dark rim. High-precision electron microprobe analyses have been performed which reveal unusually large amounts of the 'minor' elements Al, Ti, and Ca in the blue cores of these forsterites, suggesting formation by crystallization at high temperatures from a source rich in these metals. Following conclusions drawn from previous analyses of olivine in meteorites, it is argued that the minor element signature should be able to characterize olivines in micrometeorites and in deep-sea particles.

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