Factors controlling lava dome morphology

Details Factors controlling lava dome morphology Factors controlling lava dome morphology

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..172f&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 172-173 (SEE N92-10728 01-91)

Physics

Geophysics

Fluid Flow, Lava, Magma, Morphology, Planetary Geology, Rheology, Venus (Planet), Venus Surface, Volcanoes, Yield Strength, Convective Heat Transfer, Correlation, Extruding, Gravitation, Gravitational Effects, Silicon Dioxide, Solubility, Spectroscopy, Tectonics, Textures

Scientific paper

Research suggests that variations in lava dome morphology on different planets will depend much more critically on local gravity and the style of eruption than on the magma composition, ambient temperature, or the relative roles of convective and radiative cooling. Eruption style in turn reflects differences in tectonic conditions and the ability of magma to exsolve volatiles. Observed crude correlations between silica content and calculated yield strengths for terrestrial lava flows and domes probably are do to differences in extrusion rate and volatile solubility, rather than intrinsic rheological properties. Thus, even after taking the known effect of gravity into account, observed differences in gross dome morphology on different planets cannot by themselves be directly related to composition. Additional information such as the distribution of surface textures and structures, or spectroscopic data will be needed to conclusively establish dome compositions.

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