Alteration of Al-rich inclusions inside amoeboid olivine aggregates in the Allende meteorite

Details Alteration of Al-rich inclusions inside amoeboid olivine aggregates in the Allende meteorite Alteration of Al-rich inclusions inside amoeboid olivine aggregates in the Allende meteorite

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1685h&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, June 1987, p. 1685-1704. 41.

Computer Science

36

Allende Meteorite, Aluminum Compounds, Amoeba, Olivine, Perovskites, Spinel, Metal Oxides, Meteoritic Composition, Meteorites, Allende, Stony Meteorites, Carbonaceous Chondrites, Cv3 Chondrites, Aluminum, Inclusions, Samples, Meteorite, Aggregates, Olivine, Alteration, Mineralogy, Equilibration, Temperature, Matrix, Phyllosilicates, Electron Probe Methods, Composition, Thermodynamics, Calculations, Solar Nebula, Fugacity, Water, Procedure, Clinopyroxene, Texture, Photomicrographs, Electron Microscopy, Bse M

Scientific paper

The primary phases of Al-rich inclusions in amoeboid olivine aggregates have undergone alteration reactions with the solar nebular gas. The simplest interpretation of the present observations is that melilite was the first primary phase to disappear with falling temperature, and was replaced by grossular + anorthite + feldspathoids, followed by fassaite; spinel was the last phase to be altered. Thermodynamic calculations suggest that Na-rich phlogopite could have formed at about 470 K and chlorite at about 328 K at a water fugacity of 0.000001, which is that of a gas of solar composition in this temperature range. The olivine around Al-rich inclusions is not serpentized, indicating the cessation of gas-solid equilibrium above 274 K.

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