Opaline silica in young deposits on Mars

Details Opaline silica in young deposits on Mars Opaline silica in young deposits on Mars

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008geo....36..847m&link_type=abstract

Geology, vol. 36, Issue 11, p.847-850

Computer Science

85

Scientific paper

High spatial and spectral resolution reflectance data acquiredby the Mars Reconnaissance Orbiter Compact Reconnaissance ImagingSpectrometer for Mars (CRISM) instrument reveal the presenceof H2O- and SiOH-bearing phases on the Martian surface. Thespectra are most consistent with opaline silica and glass alteredto various degrees, confirming predictions based on geochemicalexperiments and models that amorphous silica should be a commonweathering product of the basaltic Martian crust. These materialsare associated with hydrated Fe sulfates, including H3O-bearingjarosite, and are found in finely stratified deposits exposedon the floor of and on the plains surrounding the Valles Marineriscanyon system. Stratigraphic relationships place the formationage of these deposits in the late Hesperian or possibly theAmazonian, implying that aqueous alteration continued to bean important and regionally extensive process on Mars duringthat time.

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