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dc.contributor.authorHorgan, B. H.
dc.contributor.authorBell, J. F. III
dc.contributor.authorNoe Dobrea, E. Z.
dc.contributor.authorCloutis, E. A.
dc.contributor.authorBailey, D. T.
dc.contributor.authorCraig, M. A.
dc.contributor.authorRoach, L. H.
dc.contributor.authorMustard, J. F.
dc.date.accessioned2018-03-07T14:40:59Z
dc.date.available2018-03-07T14:40:59Z
dc.date.issued2009-01-28
dc.identifier.citationHorgan, B.H., J.F. Bell III, E.Z. Noe Dobrea, E.A. Cloutis, D.T. Bailey, M.A. Craig, L.H. Roach, and J.F. Mustard (2009) The distribution of hydrated minerals in the north polar region of Mars. Journal of Geophysical Research - Planets, 114, E01005. DOI:10.1029/2008JE003187.en_US
dc.identifier.issn2169-9097
dc.identifier.urihttp://hdl.handle.net/10680/1389
dc.description.abstractThe previous discovery of extensive deposits of hydrated minerals in Olympia Planum in the north polar region of Mars by the Mars Express OMEGA instrument raises important questions about the origin and subsequent redistribution of these hydrated minerals. Here we present a new map of the distribution of hydrated minerals within the north polar region of Mars by applying both standard and new spectral analysis techniques to near-infrared spectral data from OMEGA. Our results are in agreement with the previous OMEGA observations but also show more extensive detections of hydrated minerals throughout the circumpolar plains, as well as new detections of hydrated minerals on the surface of Planum Boreum and within the polar troughs. We find that while the circumpolar plains hydration signatures appear to be correlated with the dark dunes of the north polar erg, hydration signatures in Planum Boreum instead appear to be correlated with the north polar veneers and their sources within the polar layered deposits. By applying laboratory-derived empirical models of the dependence of gypsum spectra on grain size and abundance, we provide approximate abundance estimates for the hydrated minerals we have identified in Observatoire pour la Minéralogie, l’Eau, les Glaces et l’Activité (OMEGA) and Compact Reconnaissance Imaging Spectrometer (CRISM) data. We find that the presence of hydrated minerals throughout the north polar region suggests (1) a complex cycle of sediment exchange between the Olympia Planum dunes and the other polar units; (2) an earlier origin for the hydrated minerals than originally postulated; and (3) the occurrence of significant water activity in this region during the Amazonian.
dc.description.sponsorshipThis work was supported by grants from the Mars Data Analysis Program under contracts from NASA, the Mars Odyssey Participating Scientist program under contracts from the Jet Propulsion Laboratory, and the Canadian Space Agency.
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2008JE003187
dc.language.isoenen_US
dc.publisherJournal of Geophysical Researchen_US
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleDistribution of hydrated minerals in the north polar region of Marsen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2008JE003187


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