Cometary analogue material - Preparation, composition, and thin section petrography

Details Cometary analogue material - Preparation, composition, and thin section petrography Cometary analogue material - Preparation, composition, and thin section petrography

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..285s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 285-288. Research supported by DFG.

Physics

16

Comets, Grain Size, Minerals, Powder (Particles), Silicates, Compression Tests, Liquid Nitrogen, Porous Materials, Spraying, Comets, Analogs, Techniques, Composition, Petrography, Samples, Dust, Laboratory Studies, Procedure, Silicate, Grain Size, Density, Crystals, Sublimation, Experiments, Porosity, Irradiation, Compression, Water, Condensation, Crystallization, Compaction, Refractory Material, Mineralogy, Optical Microscopy

Scientific paper

Cometary analog material has been synthesized in kilogram quantities by spraying suspensions of silicate mineral dust with a median grain size of 4-8 microns, and carbon (soot of about 25 nm grain size) into liquid nitrogen under controlled conditions. The samples, with densities between 0.3 and 0.7 g/cu cm, were used for sublimation experiments and or uniaxial compression tests. In one case, fragments of consolidated phonolitic tuff (0.6-2.5 and 2.5-10 mm size fractions) were admixed mechanically. By modifying existing techniques polished sections and thin sections were produced from these samples for optical microscopy. Changes in the intergrowth characteristics, the grain size of the ice crystals, and the porosity were observed in the irradiated and compressed samples. They are due to sublimation-condensation-recrystallization and compaction-recrystallization effects, respectively.

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