Mineralogical and velocity profiles of the Martian crust.

Details Mineralogical and velocity profiles of the Martian crust. Mineralogical and velocity profiles of the Martian crust.

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sosyr..27..149b&link_type=abstract

Solar System Research, Vol. 27, No. 2, p. 149 - 165

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Mars Surface: Mineralogy, Mars: Crust, Mars: Models

Scientific paper

Mineralogical profiles of the Martian crust are constructed by means of numerical thermodynamical modeling. The mineralogical structure of the crust varies with depth due to a gabbro-eclogite type transition. Density and longitudinal and transverse wave velocity profiles are computed on the basis of the mineral compositions. Calculations are carried out for three compostions of Martian basalts which have been proposed in the literature and for three alternative temperature distributions in the crust, i.e., with temperature gradients of 21, 13, and 6 K/km. Two levels in the crust may be distinguished. The upper crust (z < 50 km) is composed of ferriferous grabbroids and is characterized by densities and elastic wave velocities that are either constant or slowly decreasing with depth. The mineral composition of the rock varies with increasing crustal temperature, zones of diminished velocities and densities appear, and the mean values of the parameters decreases. These results may prove useful in the interpretation of the data of seismological studies and electromagnetic sounding, and in the construction of a rheological model of the Martian crust and of regional tectonic models of Mars.

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