A kinetic study of hydrous alteration of amorphous MgSiO smokes - Implications for cometary particles and chondrite matrix

Details A kinetic study of hydrous alteration of amorphous MgSiO smokes - Implications for cometary particles and chondrite matrix A kinetic study of hydrous alteration of amorphous MgSiO smokes - Implications for cometary particles and chondrite matrix

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..657n&link_type=abstract

(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)

Physics

7

Amorphous Materials, Chondrites, Comet Nuclei, Magnesium Compounds, Meteoritic Composition, Silicates, Grains, Halley'S Comet, Infrared Spectroscopy, Smoke, Time Dependence

Scientific paper

The authors report measurements of the rate of hydrous alteration of amorphous Mg-SiO smokes as a function of temperature as inferred by observing changes in the infrared spectra of these materials. They show that under the conditions reported for the nucleus of Comet Halley based on measurements made by the Vega and Giotto missions, amorphous, anhydrous Mg-SiO smokes would become hydrated within several weeks in the dusty regolith observed on the surface. However, if such grains were released in "jets" or from loose ice fragments, then previously amorphous grains would retain their anhydrous nature. Similarly, brief periods of aqueous activity on meteorite parent bodies would convert amorphous, fine-grained material to hydrated phyllosilictes much more rapidly than coarse mineral grains. A kinetic model might therefore be developed to explain the observed textural relationships in the matrices of carbonaceous chondrites such as Mokoia, where amorphous phyllosilicates are intimately associated with coarse anhydrous grains.

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