Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p32d0569k&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P32D-0569
Physics
5420 Impact Phenomena (Includes Cratering), 5470 Surface Materials And Properties, 6225 Mars
Scientific paper
As for the fundamental morphology of rampart crater on Mars, Demura and Kurita proposed double-lobate type is a most pristine type. The basic construction is an innner thick lobe deposited at first and a outer thin lobe deposited at next. For the rampart craters apparently classified into single-lobate type and multi-lobate type, most of them have indications of these two types ejecta formation. This means the process to create rampart crater should accompany two separate flow events by single impact event, which sets constraints on the formation process. The recent MOC-MGS images of fresh rampart craters all seem to support this morphology. Particularly the existence of scouring pattern over the inner thick lobe with depth of up to 10m shows the nature of second event. To form such scouring patterns over the inner lobe, the corresponding flow should have high momentum. Since we can not identify large mass distribution at the end region of radial scour, sparse suspension flow with high velocity is suggested. In this model apparently-flat top surface of the inner thick lobe is not the original form, but is interpreted as a result of blow-off erosion by the second flow forming the outer thin lobe. We suggest this second flow event looks similar to surgepyroclastic flow( Wohletz & Sheridan). Since the volume fraction of the outer thin lobe is small in the total ejecta, this may correspond to the collapsed part of the vapor plume
Demura Hirohide
Kurita Kazuyoshi
TANIAI K.
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