Mathematics – Logic
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.v51g0362w&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #V51G-0362
Mathematics
Logic
5464 Remote Sensing, 5480 Volcanism (8450), 8040 Remote Sensing, 8450 Planetary Volcanism (5480), 9604 Cenozoic
Scientific paper
Studies of the Potrillo volcanic field in the southern Rio Grande rift have resulted in robust datasets for volcanic stratigraphy, geochemistry and both 3He surface exposure and 40Ar/39Ar geochronology to produce a magma dynamics model. Williams' model incorporates the physical, spatial, temporal, chemical, and emplacement mechanisms for this Pleistocene age field. Volcanic activity was not continuous throughout its ~1 Ma - 20 ka history. Rather, there has been punctuated activity with frequent shifts of foci and some reoccupation of edifices after 50 ka upwards to 100 ka of quiescence. At least five eruptive phases have been documented and field-wide polycyclicity on the order of 103 to 105 years now quantified. Our current study uses remote sensing techniques that include Enhanced Thematic Mapper Plus (ETM+) and Advanced Space-borne Thermal Emission Reflectance Radiometer (ASTER) integration along with Digital Elevation Map (DEM) analyses. Evaluation of the remote sensing imagery with in situ information allows for correlation of geologic field relationships to spectral response, evaluation of deposit age versus deposit degradation (e.g. hematite development and/or spectral response), and better recognition of temporal-spatial volcanic center distributions in relationship to structural control. We also demonstrate an effective method for using ASTER data for geological mapping and other field studies in arid regions. ASTER has 14 bands, hence allowing for 364 red-green-blue (RGB) color combinations. Therefore, we apply a statistical approach including the Optimum Index Factor (OIF) to assist in selecting the most effective RGB color combinations for discriminating different geological materials. Small volume basaltic centers such as found in the Potrillo volcanic field do display a broad range of morphologic features, with several similar to those interpreted from the Mars Orbital Lander Altimeter (MOLA) topographic data: shields and flows (lava-tube and fissure-fed). A better understanding of Mars planetary volcanism through terrestrial analogs can be gained by integrating remote sensing, temporal, geochemical and geologic spatial information. Therefore, presented are preliminary observations of the Potrillo deposits for use as a terrestrial analog, with emphasis on phreatomagmatic centers (e.g. Kilbourne Hole and Malpais maar) in order to draw comparisons with martian landforms influenced by water (ice) during eruptions.
Abdelsalam Mohamed G.
McMillan M. E.
Ren Deqing
Thurmond A. K.
Williams William J.
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