Application of the sphalerite cosmobarometer to group IAB iron meteorites

Details Application of the sphalerite cosmobarometer to group IAB iron meteorites Application of the sphalerite cosmobarometer to group IAB iron meteorites

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..371k&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, March 1986, p. 371-378. NSERC-supported research.

Computer Science

2

Iron Meteorites, Meteoritic Composition, Nickel Compounds, Pressure, Zincblende, Mineralogy, Phase Diagrams, Regression Analysis, Silicates, Meteorites, Iron Meteorites, Iab Irons, Sphalerite, Composition, Catalog, Iron, Samples, Meteorite, Pressure, Procedure, Temperature, Inclusions, Diffusion, Ogallala, Copiapo, Woodbine, Landes, Toluca, Experiments, Ia Irons, Parent Bodies, Laboratory Studies, Sardis, Ib Irons, Origin, Wichita County, Gladstone, Bogou, Odessa, Mundrabilla, Formation, Nickel, Composition

Scientific paper

Sphalerite compositions from ten members of iron meteorite group IA and one member of group IB were determined and pressure (P350) calculated, assuming a blocking temperature for Fe diffusion of 350 degrees C. Although three meteorites, Ogallala and Copiapo (IA) and Woodbine (IB), yielded clearly outlying values, the remaining eight members of group IA yielded pressures that were linearly correlated with 1/(wt. pct Ni) of the meteorite; the equation of the regression line is given. Pressures calculated range from zero for Landes to 3.5 kbar for Toluca. The values for Woodbine, Copiapo and Ogallala appear to be due to the occurrence of sphalerite in Copiapo-type inclusions. Sphalerite in these inclusions is believed to be only partially re-equilibrated from compositions that were stable in winonaite parental materials.

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