Analogs of Alteration of Basaltic Andesites: Application to the Martian Northern Lowlands

Details Analogs of Alteration of Basaltic Andesites: Application to the Martian Northern Lowlands Analogs of Alteration of Basaltic Andesites: Application to the Martian Northern Lowlands

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p52b0582c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P52B-0582

Other

5410 Composition, 5464 Remote Sensing, 5494 Instruments And Techniques, 6225 Mars

Scientific paper

The surface alteration properties of Mars pose significant unsolved problems such as the presence of high levels of Si, S, and Cl in martian soils and the lack of definitive identification of specific minerals to assign to these elemental contents. Recent results from both Pathfinder and the Thermal Emission Spectrometer (TES) show a substantial portion of the Martian surface is classified as andesitic rather than basaltic volcanics. While much work has been performed to understand the alteration of basalt with application to Mars, little work has been done on andesitic alteration via acid sulfate weathering. Clearly understanding these alteration processes has direct relevance to the weathering of the Martian northern lowlands and alteration products to be observed with orbited instruments such as TES and THEMIS as well as mini-TES and the Mossbauer spectrometer on the 2003 rovers. Hydrothermal zones around Reno offer the opportunity to explore an active hydrothermal region characterized by fluctuating ground water, amorphous siliceous sinter with iron oxide overprinting, and acid sulfate alteration of andesitic volcanic rocks. The Kate Peak and Alta formations, which outcrop along Geiger Grade are predominantly andesite and dacite volcanic flows. The region has experienced extensive hydrothermal alteration and is directly adjacent to the presently active Steamboat Springs geothermal zone. Our group at UNR has acquired both hyperspectral and multispectral airborne data sets of the region for the visible, near-infrared and thermal infrared wavelength regions. We have processed these data to identify and characterize alteration minerals and their spatial variability as well as comparisons of identification and synthesis of short-wave and long-wave data sets. We will present the results of these mineral mapping efforts and discuss the implications for identification of type alteration minerals in data sets from Mars such as TES and THEMIS.

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