Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p31b..05m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P31B-05
Mathematics
Logic
5480 Volcanism (8450), 8409 Atmospheric Effects (0370), 8414 Eruption Mechanisms, 8450 Planetary Volcanism (5480)
Scientific paper
Several authors have proposed that Mars has experienced either early, or intermittent, periods of atmospheric enrichment. Volcanism on Mars appears to be predominantly basaltic, and studies of eruption dynamics show that, given similar eruption conditions and present day environments, martian volcanic eruptions should be considerably more explosive in style than subaerial terrestrial eruptions. The first order cause of this difference is Mars' lower atmospheric pressure. However, if environmental conditions have varied over martian history, resulting in increased atmospheric pressure, the styles of volcanism would have changed significantly. We present a spectrum of magmatic, volcanic eruption simulations under atmospheric regimes ranging from present day conditions to in excess of 1 bar. These illustrate how, as atmospheric pressure increases, the magma properties and eruption conditions favouring either buoyant eruption clouds or pyroclastic flow formation will have changed. Knowledge of these systematic differences in eruption styles may provide photogeologists with the information necessary to interpret environmental conditions during paleo-eruptions, based on morphological information. Interactions with surface and near-surface water or ice are not considered in detail, but the first-order consequences of such interactions are reviewed. The presence of large bodies of standing water could result in morphologies quite similar to those of terrestrial subaqueous eruptions. However, no compelling evidence for such eruptions has yet been presented.
Mitchell Karl L.
Wilson Leslie
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