期刊
METEORITICS & PLANETARY SCIENCE
卷 57, 期 10, 页码 1796-1819出版社
WILEY
DOI: 10.1111/maps.13902
关键词
-
资金
- NASA Cosmochemistry Grant [NNX14AN54G]
Climate models for Venus heavily rely on theoretical modeling and laboratory experimentation due to the extreme surface conditions and limited data. A recent study exposed volcanic glasses and basaltic minerals to simulate Venus surface conditions and observed significant reactivity and the formation of secondary minerals. These findings provide important insights for understanding Venus' surface mineralogies and their implications for future missions.
Climate models for Venus rely heavily on theoretical modeling and laboratory experimentation due to the extreme surface conditions of the planet and limited in situ surface data. To better explore the relative importance of reactions between the surface and the atmosphere on Venus, we exposed representative volcanic glasses and basaltic minerals to a large-scale simulation of Venus surface conditions with a realistic atmospheric composition. This study consistend of two experiments of 42 and 80 days that replicated both physical conditions and atmosphere composition derived from available in situ near-surface data using the Glenn Extreme Environment Rig (GEER) at the NASA Glenn Research Center. These experiments revealed significant reactivity of common Ca-bearing pyroxenes (diopside and augite) to form anhydrite. Olivine and labradorite showed minimal reactivity. Volcanic glasses, including both natural and synthetic samples, were exceptionally reactive, rapidly forming both anhydrite and thenardite (Na2SO4), as well as transition metal sulfates (i.e., Cu, Cr), halite (NaCl), and sylvite (KCl). Our results document chemical and textural alteration of sample surfaces and provide sufficient evidence for an active sulfur sink on multiple samples, with sulfates as the dominant secondary mineralogy. These experiments suggest likely surface mineralogies and solid phases present on Venus' surface with significant implications for upcoming missions and provide new data for comparison to high-temperature mineral-gas reactions prevalent on Venus, Earth, and Io.
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