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Stability of goethite /alpha-FeOOH/ and lepidocrocite /gamma-FeOOH/ to dehydration by UV radiation - Implications for their occurrence on the Martian surfaceThe geochemistry of the FeOOH polymorphs is an important consideration when evaluating the likelihood of an occurrence of detectable amounts of these minerals on Mars. An investigation is conducted regarding the stability of the FeOOH polymorphs geothite and lepidocrocite to dehydration in the presence of UV radiation. A thorough characterization of the FeOOH powders used in the laboratory experiments is presented, and the irradiational facility and experimental procedures are described. The results obtained in the conducted experiments are discussed. It is found that there is as yet no basis in laboratory experiments for inferring that perceptible UV photodehydration of FeOOH polymorphs will occur naturally on the surface of Mars on a time scale of at least 10-100 years.
Document ID
19820031756
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Morris, R. V.
(NASA Johnson Space Center Geochemistry Branch, Houston, TX, United States)
Lauer, H. V., Jr.
(Lockheed Electronics Co., Inc. Houston, TX, United States)
Date Acquired
August 10, 2013
Publication Date
November 10, 1981
Publication Information
Publication: Journal of Geophysical Research
Volume: 86
Subject Category
Lunar And Planetary Exploration
Accession Number
82A15291
Distribution Limits
Public
Copyright
Other

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