A revised surface age for the North Polar Layered Deposits of Mars
Final Published Version
AffiliationUniv Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherAMER GEOPHYSICAL UNION
CitationA revised surface age for the North Polar Layered Deposits of Mars 2016, 43 (7):3060 Geophysical Research Letters
JournalGeophysical Research Letters
Rights©2016. American Geophysical Union.All Rights Reserved.
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AbstractThe North Polar Layered Deposits (NPLD) of Mars contain a complex stratigraphy that has been suggested to retain a record of past eccentricity- and obliquity-forced climate changes. The surface accumulation rate in the current climate can be constrained by the crater retention age. We scale NPLD crater diameters to account for icy target strength and compare surface age using a new production function for recent small impacts on Mars to the previously used model of Hartmann (2005). Our results indicate that ice is accumulating in these craters several times faster than previously thought, with a 100m diameter crater being completely infilled within centuries. Craters appear to have a diameter-dependent lifetime, but the data also permit a complete resurfacing of the NPLD at similar to 1.5 ka.
NotePublished online 5 April 2016. 6 month embargo.
VersionFinal published version
SponsorsThis work was funded by NASA grant NNX13AG72G. M.E.L. was supported by the National Science Foundation Graduate Research Fellowship Program, grant DGE-1143953. HiRISE images referenced are available on the instrument's public website: https://hirise.lpl.arizona.edu. The crater catalog used in this work is included with this paper as supporting information. The authors thank S. Sutton for help with SOCET Set software, M.M. Sori for useful discussion on viscous relaxation, and M.E. Banks for useful discussion on the impact population. The authors additionally thank J.A. Skinner, P. Becerra, D. Laikko, M. Sori, N. Barlow, and an anonymous reviewer for helpful comments on the manuscript.