Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p31a13z&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #P31A-13
Physics
5464 Remote Sensing, 5480 Volcanism (8450), 8414 Eruption Mechanisms, 8429 Lava Rheology And Morphology
Scientific paper
The Carrizozo basalt flow in south-central New Mexico is the longest subaerial lava flow in the United States. This compound pahoehoe flow extends 75 km to the south-southwest from its apparent source at the Little Black Peak cinder cones. Field work and Differential Global Positioning System (DGPS) measurements show that the flow field consists of several discreet lobes, each with relatively level upper surfaces at different elevations. Both the proximal and distal portions of the flow field cover up to 5-km-wide sections of the valley down which the flows were emplaced, and both areas have terraced margins interpreted to represent discreet packages of emplaced lava. The narrow central portion of the flow is dominated by a medial ridge that appears to be the collapsed remnant of a single large lava tube. All field evidence supports the interpretation that the lava at Carrizozo was emplaced at a modest effusion rate, so that complete flow field emplacement may have spanned decades. Published topographic maps of the flow were digitized and compiled into a Digital Elevation Model; when supplemented by the DGPS data, the DEM should be the most detailed topographic representation available for a compound flow field. The attributes of the Carrizozo flow field are used as an analog for evaluating selected flows on Mars. New data obtained by the Mars Orbiter Camera and the Mars Orbiter Laser Altimeter allow both qualitative and quantitative comparisons to be made between Carrizozo and various Martian flows. To date, most long Martian flows appear to lack the multiple flow lobes and the terraced margins that distinguish the Carrizozo flow field. As new data from Mars continue to be released, the Carrizozo flow field will be a valuable resource to which Martian flows can be compared in evaluating their emplacement conditions.
Itzkoff J.
Johnston Andrew K.
Zimbelman James R.
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