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Equatorial locations of water on Mars : improved resolution maps based on Mars Odyssey Neutron Spectrometer data.

Wilson, Jack T. and Eke, Vincent R. and Massey, Richard J. and Elphic, Richard C. and Feldman, William C. and Maurice, Sylvestre and Teodoro, Luís F.A. (2018) 'Equatorial locations of water on Mars : improved resolution maps based on Mars Odyssey Neutron Spectrometer data.', Icarus., 299 . pp. 148-160.

Abstract

We present a map of the near subsurface hydrogen distribution on Mars, based on epithermal neutron data from the Mars Odyssey Neutron Spectrometer. The map’s spatial resolution is approximately improved two-fold via a new form of the pixon image reconstruction technique. We discover hydrogen-rich mineralogy far from the poles, including  ∼10 wt.% water equivalent hydrogen (WEH) on the flanks of the Tharsis Montes and  >40 wt.% WEH at the Medusae Fossae Formation (MFF). The high WEH abundance at the MFF implies the presence of bulk water ice. This supports the hypothesis of recent periods of high orbital obliquity during which water ice was stable on the surface. We find the young undivided channel system material in southern Elysium Planitia to be distinct from its surroundings and exceptionally dry; there is no evidence of hydration at the location in Elysium Planitia suggested to contain a buried water ice sea. Finally, we find that the sites of recurring slope lineae (RSL) do not correlate with subsurface hydration. This implies that RSL are not fed by large, near-subsurface aquifers, but are instead the result of either small ( < 120 km diameter) aquifers, deliquescence of perchlorate and chlorate salts or dry, granular flows.

Item Type:Article
Full text:(AM) Accepted Manuscript
First Live Deposit - 29 August 2017
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.icarus.2017.07.028
Publisher statement:© 2017 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Record Created:29 Aug 2017 09:43
Last Modified:19 Sep 2018 09:17

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