Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p33b1460w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P33B-1460
Mathematics
Logic
1160 Planetary And Lunar Geochronology
Scientific paper
Crater counting allows for the relative dating of regions on planetary bodies. In the past, only visible impact craters could be observed by looking at images and altimetry data. In 2004, a crustal thickness model (CTM) for Mars was derived from density and altimetry data, revealing buried impact structures. Updated MRO gravity solutions allowed for the production of an improved CTM of Mars by Neumann et al., 2008 [1]. This higher resolution dataset allows for the identification of more buried impact structures. Four rectangular ~14.5x106 km2 areas were chosen, two in the highlands (H1, H2) and two in the lowlands (L1, L2), to compare the cumulative frequency curves (CFC) produced from the old and new models. The CFCs we produced using the new model had a similar slopes to those produced by Edgar and Frey, 2008[2], however, they were shallower in all test areas compared to those from the old data set. The test areas were then broken up into four quadrants, and it was found that there was high variability in the CFCs within each test area, which was attributed to the geology. Subsequently, we analyzed two ~7.5x106 km2 geologic units, one in the highlands (H3) composed of Noachian plateau material and one in the lowlands (L3) composed of Amazonian plains material. Using the previous data set, there were not enough features in H3 and L3 to produce a working CFC, however, the improved resolution in the new CTM allowed for this analysis. The use of this new CTM allows us to refine and improve the CFCs in local regions to better constrain the relative age of those regions. Through dating all the individual regions on Mars we will be able to better reconstruct the geologic history of the planet. [1] Neumann, G. A., et al. (2008) Marscrust3- A Crustal Thickness Inversion from Recent MRO Gravity Solutions, LPI Conf. Abstracts, 39, 2167 [2] Edgar, L. A., and Frey, H. V. (2008) Buried impact basin distribution on Mars: Contributions from crustal thickness data, Geophys. Res. Lett., 35, L02201.
Davatzes Alix K.
Frey Herbert V.
Wyant M. A.
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