Gypsum, bassanite, and anhydrite at Gale crater, Mars

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Gypsum, bassanite, and anhydrite at Gale crater, Mars

Messaggio da Marco E. Ciriotti » lun 26 mar, 2018 9:42

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Referenza:
▪ Vaniman, D.T., Martínez, G.M., Rampe, E.B., Bristow, T.F., Blake, D.F., Yen, A.S., Ming, D.W., Rapin, W., Meslin, P.-Y., Morookian, J.M., Downs, R.T., Chipera, S.J., Morris, R.V., Morrison, S.M., Treiman, A.H., Achilles, C.N., Robertson, K., Grotzinger, J.P., Hazen, E.M., Wiens, R.C., Sumner, D.Y. (2018): Gypsum, bassanite, and anhydrite at Gale crater, Mars. American Mineralogist, 103, (in press).
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Re: Gypsum, bassanite, and anhydrite at Gale crater, Mars

Messaggio da TOSATO FABIO » lun 26 mar, 2018 13:09

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Marco E. Ciriotti
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Re: Gypsum, bassanite, and anhydrite at Gale crater, Mars

Messaggio da Marco E. Ciriotti » lun 26 mar, 2018 14:26

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Marco E. Ciriotti
Messaggi: 24596
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Re: Gypsum, bassanite, and anhydrite at Gale crater, Mars

Messaggio da Marco E. Ciriotti » gio 05 lug, 2018 14:59

Referenza:
▪ Vaniman, D.T., Martínez, G.M., Rampe, E.B., Bristow, T.F., Blake, D.F., Yen, A.S., Ming, D.W., Rapin, W., Meslin, P.-Y., Morookian, J.M., Downs, R.T., Chipera, S.J., Morris, R.V., Morrison, S.M., Treiman, A.H., Achilles, C.N., Robertson, K., Grotzinger, J.P., Hazen, E.M., Wiens, R.C., Sumner, D.Y. (2018): Gypsum, bassanite, and anhydrite at Gale crater, Mars. American Mineralogist, 103, 1011–1020.

Abstract:
Analyses by the CheMin X‑ray diffraction instrument on Mars Science Laboratory show that gypsum, bassanite, and anhydrite are common minerals at Gale crater. Warm conditions (~6 to 30 °C) within CheMin drive gypsum dehydration to bassanite; measured surface temperatures and modeled temperature depth profiles indicate that near-equatorial warm-season surface heating can also cause gypsum dehydration to bassanite. By accounting for instrumental dehydration effects we are able to quantify the in situ abundances of Ca-sulfate phases in sedimentary rocks and in eolian sands at Gale crater. All three Ca-sulfate minerals occur together in some sedimentary rocks and their abundances and associations vary stratigraphically. Several Ca-sulfate diagenetic events are indicated. Salinity-driven anhydrite precipitation at temperatures below ~50 °C may be supported by co-occurrence of more soluble salts. An alternative pathway to anhydrite via dehydration might be possible, but if so would likely be limited to warmer near-equatorial dark eolian sands that presently contain only anhydrite. The polyphase Ca-sulfate associations at Gale crater reflect limited opportunities for equilibration, and they presage mixed salt associations anticipated in higher strata that are more sulfate-rich and may mark local or global environmental change. Mineral transformations within CheMin also provide a better understanding of changes that might occur in samples returned from Mars.
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