Gas permeability of shocked chondrites

Details Gas permeability of shocked chondrites Gas permeability of shocked chondrites

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986metic..21..109m&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 21, March 31, 1986, p. 109-116. NSERC-supported research.

Physics

2

Chondrites, Gas Pressure, Permeability, Porous Materials, Shock Heating, Metamorphism (Geology), Pressure Dependence, Meteorites, Ordinary Chondrites, Shock Effects, Gases, Permeability, Pressure, Porosity, Cracks, Parent Bodies, Samples, Meteorite, Size, Experiments, Laboratory Studies, Procedure, H Chondrites, L Chondrites, Leedey, New Concord, Bruderheim, Gladstone, Monroe, Kunashak, Wellman, Farmington, Arapahoe, Gilgoin

Scientific paper

The gas permeability of 11 ordinary chondrites was measured at various gas pressures (0.5-2.5 bars) under confining pressures up to 120 bars. The gas permeability ranges from less than a nanodarcy to a few millidarcies. There is a positive correlation between the permeability and the porosity. The permeabilithy decreased by as much as 50 percent when the confining pressure was increased from 10 to 100 bars, suggesting that the permeability of some chondrites is partly due to cracks. A linear relation between gas flow pressure dependence and confining pressure dependence of the gas permeability is observed, suggesting that on average, crack apertures are larger than pore spaces. The permeabilithy of heavily-shocked chondrites is less than of mildly shocked chondrites. Using the measured permeability data the size of a possible shocked-chondrite precursor body is estimated.

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