Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p23c0071b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P23C-0071
Mathematics
Logic
3672 Planetary Mineralogy And Petrology (5410), 5464 Remote Sensing, 6225 Mars, 8450 Planetary Volcanism (5480, 6063, 8148), 8485 Remote Sensing Of Volcanoes
Scientific paper
Volcanism has occurred extensively over the history of Mars, and surficial Martian volcanic deposits are widespread. Understanding the nature and distribution of volcanic materials is crucial for determining the geologic history of Mars, including its thermal and chemical evolution as well as the volcanic processes that have shaped its surface. The objective of this investigation is to quantitatively examine the composition and distribution of proposed silicic igneous materials through deconvolution of data from the Mars Global Surveyor Thermal Emission Spectrometer (TES) and the Mars Odyssey Thermal Emission Imaging System (THEMIS), including in the endmember library a suite of volcanic glass analogs that previously have been synthesized and characterized in the laboratory. Because the spectrum of a glass phase markedly differs from its mineral counterpart, examination of glasses is important to accurately determine the composition and distribution of surface materials. Moreover, glasses are particularly important for examining silicic volcanic materials because evolved volcanic products typically have significantly higher glass content than mafic volcanic materials. However, a complete, accurate surface characterization is complicated by the fact that other amorphous silicates typically have similar spectral features to those of glasses, and the range of glass compositions previously used has been limited. Our new suite of silicic glasses broadens the range of amorphous materials that is currently being applied to Mars thermal infrared (TIR) remote sensing deconvolution studies. Preliminary assessments suggest that silicic glasses may be present on the surface of Mars; further spectral and morphologic analyses will help to constrain what phases are likely to exist.
Bandfield Joshua L.
Byrnes Jeffrey M.
Johnson Jay Robert
King Penelope L.
Ramsey Michael S.
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