Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p13d..04d&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P13D-04
Physics
[5480] Planetary Sciences: Solid Surface Planets / Volcanism, [8428] Volcanology / Explosive Volcanism
Scientific paper
Phreatomagmatic activity may have helped shape the surface of early Mars and the landforms generated in such events provides clues to both the magmatic and environmental conditions in the near surface. We study the dynamics of explosions generated by rapid steam generation in the near surface when magma intersects a source of liquid water or ice. Using an EEL multiphase model we study the thermal evolution in the source region, the pressure evolution due to phase change, and the compressible multiphase dynamics of the blast and subsequent gravity currents. This numerical model was validated on similar blast conditions through a sequence of scaled analogue experiments. Both the dilute and dense part of the granular flow are modeled and we correlate dynamics during the blast to eventual depositional features such as grain size sorting, flow runout, crater size and shape, and distribution of large clasts. In this way we correlate the pre-eruptive conditions to landform morphology that may be useful in interpreting on-going observations. We also report on the mixing of gas species in explosive events to better understand the distribution of water during and after the blast. Using microsphysical models we also assess the spatial and temporal potential for electrostatic and hydrous particle aggregation.
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