Opaline silica in young deposits on Mars

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High spatial and spectral resolution reflectance data acquired by the Mars Reconnaissance Orbiter Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) instrument reveal the presence of H2O- and SiOH-bearing phases on the Martian surface. The spectra are most consistent with opaline silica and glass altered to various degrees, confirming predictions based on geochemical experiments and models that amorphous silica should be a common weathering product of the basaltic Martian crust. These materials are associated with hydrated Fe sulfates, including H3O-bearing jarosite, and are found in finely stratified deposits exposed on the floor of and on the plains surrounding the Valles Marineris canyon system. Stratigraphic relationships place the formation age of these deposits in the late Hesperian or possibly the Amazonian, implying that aqueous alteration continued to be an important and regionally extensive process on Mars during that time.

Publication type Article
Publication Subtype Journal Article
Title Opaline silica in young deposits on Mars
Series title Geology
DOI 10.1130/G24967A.1
Volume 36
Issue 11
Year Published 2008
Language English
Publisher Geological Society of America
Contributing office(s) Crustal Geophysics and Geochemistry Science Center
Description 4 p.
First page 847
Last page 850
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