First high-resolution stratigraphic column of the Martian north polar layered deposits

Details First high-resolution stratigraphic column of the Martian north polar layered deposits First high-resolution stratigraphic column of the Martian north polar layered deposits

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3707201f&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 7, CiteID L07201

Mathematics

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Planetary Sciences: Solid Surface Planets: Polar Regions, Planetary Sciences: Solar System Objects: Mars, Geochronology: Planetary And Lunar Geochronology, Geochronology: Geomorphological Geochronology, Cryosphere: Ice Cores (4932)

Scientific paper

This study achieves the first high-spatial-resolution, layer-scale, measured stratigraphic column of the Martian north polar layered deposits using a 1m-posting DEM. The marker beds found throughout the upper North Polar Layered Deposits range in thickness from 1.6 m-16.0 m +/- 1.4 m, and 6 of 13 marker beds are separated by ˜25-35 m. Thin-layer sets have average layer separations of 1.6 m. These layer separations may account for the spectral-power-peaks found in previous brightness-profile analyses. Marker-bed layer thicknesses show a weak trend of decreasing thickness with depth that we interpret to potentially be the result of a decreased accumulation rate in the past, for those layers. However, the stratigraphic column reveals that a simple rhythmic or bundled layer sequence is not immediately apparent throughout the column, implying that the relationship between polar layer formation and cyclic climate forcing is quite complex.

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