Dark materials in Valles Marineris - Indications of the style of volcanism and magmatism on Mars

Details Dark materials in Valles Marineris - Indications of the style of volcanism and magmatism on Mars Dark materials in Valles Marineris - Indications of the style of volcanism and magmatism on Mars

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9514399g&link_type=abstract

(American Geophysical Union and Geological Society of America, International Conference on Mars, 4th, Tucson, AZ, Jan. 10-13, 19

Mathematics

Logic

29

Magma, Mars Volcanoes, Planetary Crusts, Volcanology, Erosion, Mapping, Reflectance

Scientific paper

Computer mapping of spectral reflectance in Viking Orbiter I multispectral images is combined with photogeological interpretation and used to examine the geological significance of the dark materials in Valles Marineris, a canyon system that provides a unique view of the interior of the Martian crust. Special consideration is given to the relation of the dark materials to the past episodes of tectonism, volcanic activity, and igneous intrusion. Spectral mapping suggests that the dark floor-covering materials in the lower canyon are derived from a thick deposit composed of mafic glass, possibly an ancient Martian analogue of the lunar terra mantling deposits. Application of computer mapping techniques to probable young volcanic materials in the central troughs yields an inferred distribution of volcanic activity consistent with the interpretation of extrusion along faults near the margins of the canyon floors. The results support the hypothesis that Valles Marineris originated through tectonic extension.

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