Occurence and implications of silicon nitride in enstatite chondrites

Details Occurence and implications of silicon nitride in enstatite chondrites Occurence and implications of silicon nitride in enstatite chondrites

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29...79a&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 1, p. 79-84

Computer Science

14

Chondrites, Enstatite, Meteoritic Composition, Nitrogen Isotopes, Silicon Isotopes, Abundance, Chemical Composition, Meteorites, Stony Meteorites, Chondrites, Enstatites, Silicon Nitride, Qingzhen, Indarch, Eh Chondrites, Samples, Meteorite, Laboratory Studies, Ion Probe Methods, Silicon, Nitrogen, Carbon, Isotopes, Thermodynamics, Origin, Metamorphism, Kinetics, Sinoite, Procedure, Petrology, Description, Temperature, Pressure

Scientific paper

Silicon nitride Si3N4, has previously been observed to be a common constituent of acid residues of Qingzhen (EH3) and Indarch (EH4). Ion probe analysis of the Si, N and C isotopic compositions of individual Si3N4 grains from Qingzhen and Indarch acid residues suggest most, if not all, grains are Solar System in origin. A few grains have isotopically anomalous C but this is probably due to small presolar SiC grains adhering to them. In situ observations of the Si3N4 in Qingzhen show that it is only present within, and probably exsolved from, host phases which contain elemental Si in solid solution. Thermodynamic calculations suggest that the Si3N4 probably formed during metamorphism and not in the nebula. Thermodynamic calculations also show that sinoite (Si2N2O) and not Si3N4 should be the stable phase during metamorphism. It appears that kinetic factors must have inhibited the formation if sinoite in Qimgzhen and Indarch.

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