Raman , Mir , and Nir Spectroscopic Study of Calcium Sulfates : Gypsum , Bassanite
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Raman , Mir , and Nir Spectroscopic Study of Calcium Sulfates
Introduction: Gypsum (CaSO 4 .2H 2 O) and bassanite (CaSO 4 .0.5H 2 O) were identified on Mars by OMEGA on Mars Express and CRISM on MRO [1, 2, 3]. An-hydrite (CaSO 4) is non-active in the spectral range of OMEGA and CRISM, but may also exist [4]. Ca-sulfate was inferred from compositional correlations revealed by APXS on Mars Exploration Rovers [5, 6, 7], but no definitive identification, as w...
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MIL03346 meteorite: It is a martian meteorite (nakhlite) collected from Miller Range, Antarctica. It contains variety of hydrous Caand Fe 3+ -sulfates, and other H2O/OH-bearing species, thus has been extensively studied, with a purpose to build the links to aqueous alteration processes on Mars [4-9]. The martian origin of Ca-sulfates and jarosites in MIL 03346 is validated by the finding of the...
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Introduction: Sulfate species were verified by Pathfinder in 1997 and more recently by the Mars Exploration Rovers (MER). The best evidence for sulfates on Mars came from the Opportunity rover in Meridiani Planum, where data supporting the existence of Ca and Mg-sulfates were collected from alpha-proton X-ray spectroscopy and thermal emission spectroscopy [1,2]. Hyperspectral VNIR OMEGA images ...
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