Crater population and resurfacing of the Martian north polar layered deposits

Details Crater population and resurfacing of the Martian north polar layered deposits Crater population and resurfacing of the Martian north polar layered deposits

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgre..11508006b&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue E8, CiteID E08006

Mathematics

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Planetary Sciences: Solar System Objects: Mars, Planetary Sciences: Solid Surface Planets: Polar Regions, Planetary Sciences: Solid Surface Planets: Impact Phenomena, Cratering (6022, 8136), Planetary Sciences: Solid Surface Planets: Erosion And Weathering

Scientific paper

Present-day accumulation in the north polar layered deposits (NPLD) is thought to occur via deposition on the north polar residual cap. Understanding current mass balance in relation to current climate would provide insight into the climatic record of the NPLD. To constrain processes and rates of NPLD resurfacing, a search for craters was conducted using images from the Mars Reconnaissance Orbiter Context Camera. One hundred thirty craters have been identified on the NPLD, 95 of which are located within a region defined to represent recent accumulation. High Resolution Imaging Science Experiment images of craters in this region reveal a morphological sequence of crater degradation that provides a qualitative understanding of processes involved in crater removal. A classification system for these craters was developed based on the amount of apparent degradation and infilling and where possible depth/diameter ratios were determined. The temporal and spatial distribution of crater degradation is interpreted to be close to uniform. Through comparison of the size-frequency distribution of these craters with the expected production function, the craters are interpreted to be an equilibrium population with a crater of diameter D meters having a lifetime of ˜30.75D1.14 years. Accumulation rates within these craters are estimated at 7.2D-0.14 mm/yr, which corresponds to values of ˜3-4 mm/yr and are much higher than rates thought to apply to the surrounding flat terrain. The current crater population is estimated to have accumulated in the last ˜20 kyr or less.

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