Down-flow Geomorphometric Analysis and Rheological Modeling of Long Lava Flows on Five Planetary Surfaces

Details Down-flow Geomorphometric Analysis and Rheological Modeling of Long Lava Flows on Five Planetary Surfaces Down-flow Geomorphometric Analysis and Rheological Modeling of Long Lava Flows on Five Planetary Surfaces

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p71b0458p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #P71B-0458

Mathematics

Logic

5410 Composition, 5470 Surface Materials And Properties, 5480 Volcanism (8450), 6207 Comparative Planetology, 8429 Lava Rheology And Morphology

Scientific paper

A series of statistical analyses and modeling studies on a database of new geomorphometric data for lava flow on five planetary surfaces (abstract #296,Zimbelman et al., AGU Fall 2002) is conducted to constrain the processes active in the emplacement of long lava flows (here defined as flows whose traceable length exceeds 50 km). Flow parameters (widths and thicknesses) and environmental factors (e.g., local slopes) are registered as functions of downflow distance for each lava flow. The data are then evaluated statistically for trends suggested by current emplacement models. A strong inverse correlation has been identified between the local gravitational field and the average flow thickness; this is consistent with most of the conventional rheological flow models. The database parameters are also used to estimate rheological properties (e.g. velocity, viscosity, flow rate); inferences are then drawn. Initial results suggest that a variety of mechanisms dominate the emplacement of long lava flows. Modeled changes in rheology of some flows are consistent with the cooling of simple flow lobes, but others suggest more patterns of greater complexity . Cyclical variations are suggestive of repeated episodes or "pulses" of emplacement, while other flows demonstrate evidence for strong topographic control, or volume-limited behavior.

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