Stability of goethite /alpha-FeOOH/ and lepidocrocite /gamma-FeOOH/ to dehydration by UV radiation - Implications for their occurrence on the Martian surface

Details Stability of goethite /alpha-FeOOH/ and lepidocrocite /gamma-FeOOH/ to dehydration by UV radiation - Implications for their occurrence on the Martian surface Stability of goethite /alpha-FeOOH/ and lepidocrocite /gamma-FeOOH/ to dehydration by UV radiation - Implications for their occurrence on the Martian surface

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8610893m&link_type=abstract

Journal of Geophysical Research, vol. 86, Nov. 10, 1981, p. 10893-10899.

Physics

16

Mars, Surface, Ultraviolet, Wavelengths, Radiation, Experiments, Data, Minerals, Goethite, Lepidocrocite, Irradiation, Heating, Thermal Effects, Chemistry, Physical Properties, Characteristics, Analysis, Dehydration, Procedure, Magnetization, Magnetic Properties, Equipment, Temperatures, Photoelectric Effects, Diagrams

Scientific paper

The 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.

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