Preferential low-pH dissolution of pyroxene in plagioclase pyroxene mixtures: Implications for martian surface materials

Details Preferential low-pH dissolution of pyroxene in plagioclase pyroxene mixtures: Implications for martian surface materials Preferential low-pH dissolution of pyroxene in plagioclase pyroxene mixtures: Implications for martian surface materials

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008icar..196...90m&link_type=abstract

Icarus, Volume 196, Issue 1, p. 90-96.

Mathematics

Logic

7

Scientific paper

Acid weathering of plagioclase pyroxene mixtures has been investigated with an open system kinetic dissolution model. The modeling reveals that elevated plagioclase/pyroxene ratios observed in some low-albedo martian regions and atmospheric dust could be partially caused by preferential dissolution of pyroxenes at pHs below ˜3 4. Surface materials with smaller grain sizes, affected by lower pH fluids, and/or exposed to longer durations of acid weathering would be enriched in plagioclase. If preferential dissolution is responsible for the observed mineral ratios, the dissolution process likely occurred on a large scale, such as weathering by acid atmospheric precipitates. If dissolution was continuous, modeled timeframes required to produce a high plagioclase/pyroxene ratio are short on geologic timescales; however, it is likely that acid weathering on Mars was episodic, possibly occurring over a longer period of time.

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