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Iron-rich Clay Minerals on Mars: Potential Sources or Sinks for Hydrogen and Indicators of Hydrogen Loss over Time

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dc.contributor.author Burt, Donald M.
dc.coverage.spatial Mars (Planet)
dc.date.accessioned 2020-06-18T17:48:31Z
dc.date.available 2020-06-18T17:48:31Z
dc.date.issued 1989
dc.identifier.citation Proceedings of the 19th Lunar and Planetary Science Conference, pp. 423-432 Copyright 1989, Lunar and Planetary Institute, Houston en
dc.identifier.uri https://hdl.handle.net/20.500.11753/1591
dc.description.abstract Although direct evidence is lacking, indirect evidence suggests that iron-rich clay minerals or poorly ordered chemical equivalents ("palagonite") are widespread on the martian surface. Such clays (or other Fe and OH-bearing phases) can act as sources or sinks for hydrogen ("hydrogen sponges"). Ferrous clays can lose hydrogen, and ferric clays (especially dehydrogenated "oxy-clays") gain it by the coupled substitution Fe3+o(Fe2+0H)1, equivalent to minus atomic H. This "oxy-clay'' substitution (H2-loss) involves only proton and electron migration through the crystal structure, and therefore occurs nondestructively and reversibly, at relatively low temperatures. The reversible, low-temperature nature of this reaction contrasts with the irreversible nature of destructive dehydroxylation (H20-loss) suffered by clays heated to high temperatures. en
dc.format.extent Pages 423-432
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Lunar and Planetary Institute en
dc.relation.ispartof Proceedings of the 19th Lunar and Planetary Science Conference
dc.relation.ispartofseries LPI contribution ; no. 675
dc.subject Clay en
dc.subject Mars (Planet) en
dc.subject.lcc QB641
dc.title Iron-rich Clay Minerals on Mars: Potential Sources or Sinks for Hydrogen and Indicators of Hydrogen Loss over Time en
dc.type Book chapter en


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