Spatial distributions of secondary minerals in the Martian meteorite MIL 03346,168 determined by Raman spectroscopic imaging

摘要: Miller Range (MIL) 03346 is a nakhlite meteorite that has been extensively studied due to its unique complex secondary mineral phases and their potential implications for the hydrologic history of Mars. We conducted set Raman spectroscopic imaging studies MIL 03346,168, focusing on spatial distributions, with goal better understand possible processes by which they were generated This study revealed three types calcium sulfates, solid solution (K, Na)-jarosite two groups hydrated species low crystallinity (HSLC) in veins and/or mesostasis areas meteorite. The most abundant Ca-sulfate bassanite suggests paths direct precipitation from Ca-S-H2O brine, either having water activity or incomplete development (producing gypsum microcrystals) second soluble γ-CaSO4 raises new question origins this phase Martian meteorite, since readily hydrates laboratory but apparently stable Atacama Desert. close relationship solutions rasvumite (KFe2S3), magnetite, HSLC, fine-grained low-crystallinity alkali feldspar situ formation jarosite these Fe-K,Na-S-O-H2O species.