Soluble sulfate in the martian soil at the Phoenix landing site
作者： Samuel P. Kounaves , Michael H. Hecht , Jason Kapit , Richard C. Quinn , David C. Catling
DOI: 10.1029/2010GL042613
关键词: CRISM 、 Martian soil 、 Soil water 、 Mineralogy 、 Martian 、 Epsomite 、 Geology 、 Gypsum 、 Sulfur 、 Sulfate
摘要: [1] Sulfur has been detected by X-ray spectroscopy in martian soils at the Viking, Pathfinder, Opportunity and Spirit landing sites. Sulfates have identified OMEGA CRISM Valles Marineris spectrometers on MER rovers Meridiani Gusev. The ubiquitous presence of sulfur interpreted as a widely distributed sulfate mineralogy. One goal Wet Chemistry Laboratory (WCL) NASA's Phoenix Mars Lander was to determine soluble soil. We report here first in-situ measurement equivalent ~1.3(±0.5) wt% SO 4 results models reveal predominately MgSO with some CaSO . If soil had wet past, epsomite gypsum would be formed from evaporation. WCL-derived salt composition indicates that if site were form an aqueous solution natural means, water activity for dilution greater than ~0.015 g H 2 O/g habitable range known terrestrial halophilic microbes.
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