Origin of iron-rich olivine in the matrices of type 3 ordinary chondrites - an experimental study

Details Origin of iron-rich olivine in the matrices of type 3 ordinary chondrites - an experimental study Origin of iron-rich olivine in the matrices of type 3 ordinary chondrites - an experimental study

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..85..537n&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 85, no. 4, Oct. 1987, p. 537-547.

Physics

9

Chondrites, Geochemistry, Iron, Lithology, Olivine, Nebulae, Solar Physics, Meteorites, Stony Meteorites, Ordinary Chondrites, Origin, Olivine, Iron, Enrichment, Matrix, Laboratory Studies, Experimental Studies, Thermal Effects, Formation, Composition, Mineralogy, Silica, Sem, Oxidation, Condensation, Fractionation, Procedure, Chemistry, Composition, Electron Microscopy, Photomicrographs, Chondrites, H Chondrites, L Chondrites, Ll Chondrites

Scientific paper

The reaction of metallic iron and enstatite, with and without forsterite and SiO2, is experimentally studied at temperatures between 1150 and 800 C in order to investigate the origin of iron-rich olivine in the matrices of type 3 chondrites. The composition of olivine is shown to become more iron-rich with increasing silica/enstatite ratio. Possible scenarios for the origin of this olivine include: (1) free silica having been present if the iron-rich olivine was formed by solid-state reactions under oxidizing conditions in the solar nebula; and (2) the reaction of silicon-rich gas with metallic iron having taken place under oxidizing conditions in the solar nebula.

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