Experimental calibration of the sphalerite cosmobarometer

Details Experimental calibration of the sphalerite cosmobarometer Experimental calibration of the sphalerite cosmobarometer

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..101h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Jan. 1983, p. 101-108. Research supported by the Geological Society of America; Natio

Mathematics

Logic

2

Barometers, Calibrating, Iron Compounds, Pressure Measurement, Zincblende, Meteoritic Composition, Pressure Dependence, Sulfides, Temperature Dependence, Troilite

Scientific paper

Aqueous and anhydrous alkali halide flux recrystallization techniques were used to determine the pressure and temperature dependence of the composition of sphalerite in equilibrium with troilite and metallic iron at 1.5 and 5.0 kbar in the 400-800 C temperature range. The measured pressure effect is described by the equation (T in Kelvin): P (kbar) = -3.76 + 0.0551T - 0.0296T log mole % FeSe. It is concluded that the effect of pressure and temperature on the composition of sphalerite in equilibrium with troilite and iron provide a reliable calibration of the sphalerite cosmobarometer. Assuming temperatures of final equilibration between sphalerite and troilite of 350 C for iron meteorites and 600 C for enstatite chondrites, the following estimates of pressures of formation and possible radii of parent objects of meteorites are obtained from published analyses of sphalerites: IA irons (Landes, Sardis, Gladstone, Bogou, Odessa, Toluca) 0.0 to 3.5 kbar, 0 to 442 km; E6 enstatite chondrites (Yilmia, Pillistfer) -0.2 to 0.7 kbar, 0 to 198 km.

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