Shock melting of carbonate, plagioclase, and silica in the Martian meteorite ALH84001

Details Shock melting of carbonate, plagioclase, and silica in the Martian meteorite ALH84001 Shock melting of carbonate, plagioclase, and silica in the Martian meteorite ALH84001

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1271s&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 271.

Computer Science

4

Mars Surface, Meteoritic Composition, Carbonates, Silicon Dioxide, Hypervelocity Impact, Thermal Shock, Melting, Pyroxenes, Crystallization

Scientific paper

To help understand the origin of carbonates, deformation features in the rock, and their relative formation times, we have studied ALH84001,53 using optical and scanning electron microscopy and electron probe analysis. We describe the textures and compositions of plagioclase glass, silica, and carbonate grains 2-200 microns in size, focusing on occurrences not previously studied in detail. We infer that carbonate grains presently in ALH84001 did not form by metasomatic replacement of silicates or biogenically from low-temperature fluids. Carbonate, plagioclase, and silica were probably melted and partly mobilized during a single shock of approximately 50 GPa that also formed the brecciated zones in the rock.

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