A silicic shield volcano in Bolivia

Details A silicic shield volcano in Bolivia A silicic shield volcano in Bolivia

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..275c&link_type=abstract

In NASA, Washington Repts. of Planetary Geol. and Geophys. Program p 275-276 (SEE N85-23474 13-91)

Astronomy and Astrophysics

Astronomy

Bolivia, Earth Observations (From Space), Geomorphology, Magma, Silicon Dioxide, Volcanoes, Chemical Composition, Craters, Mars (Planet), Radar Imagery, Space Shuttles, Spaceborne Astronomy, Terrain, Venus (Planet)

Scientific paper

Volcan Quemado and its environs provides an excellent site to study the radar signature of a silicic volcanic construct. This feature differs from basaltic terrains primarily by the evidence of explosive eruptions associated with silica-rich magmas. These explosions produced a complex of distinctive craters that are visible on radar because of their steep inner walls and exposed bedrock units. Explosive events also generated surface deposits of fine (1 mm to 10 cm) material that mantles the region around the volcano to a distance of 20 to 30 km from its center. These features are very different from those observed on basaltic flows, which typically lack violet, explosive events. In these terrains, the surface is dominated by radar-rough flows with steep, lobate flow fronts. Craters are less common, although maars are found in some regions. These comparisons suggest that spaceborne radar may be able to distinguish surface characteristics that can be used to identify volcanic eruptive styles on Venus, Mars, and other solar-system bodies.

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