Planetary science: Are there active glaciers on Mars? (Reply)

Details Planetary science: Are there active glaciers on Mars? (Reply) Planetary science: Are there active glaciers on Mars? (Reply)

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005natur.438e..10h&link_type=abstract

Nature, Volume 438, Issue 7069, pp. 10 (2005).

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Gillespie et al. concur with our interpretation that certain lobate equatorial and mid-latitude features on Mars are due to debris-covered glaciers formed largely during past periods of increased spin-axis obliquity, when climate regimes favoured snow and ice accumulation and glacial flow. They suggest that the `hourglass' deposit, dated at more than 40 Myr old, could be active today owing to an additional mechanism that supports ``local augmentation of accumulation from snowfall'' without climate change on Mars. This mechanism requires the present, or very recent, release of groundwater to the surface to form aufeis (groundwater-fed `glaciers') where the groundwater is generated by dewatering of hydrous compounds or melting by magmatic or impact-generated heat. We assess whether this suggestion applies to the deposits in question - it was previously proposed for much older deposits in other areas of Mars. We make particular reference to the key relationships in the accumulation zones.

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