Compositional gradients across mare-highland contacts - The importance of lateral mixing

Details Compositional gradients across mare-highland contacts - The importance of lateral mixing Compositional gradients across mare-highland contacts - The importance of lateral mixing

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..811l&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 811.

Other

Lunar Surface, Clementine Spacecraft, Abundance, Highlands, Mathematical Models, Ejecta, Craters

Scientific paper

The relative importance of vertical vs lateral mass transport on the moon has been the object of much debate. With the new multispectral observations provided by the Clementine spacecraft, we can now quantitatively analyze the magnitude of transport and assess the processes contributing to the observed distributions. We are currently analyzing a number of mare-highland boundaries but most analyzed thus far exhibit similar systematics to that observed in the Grimaldi Basin. On the basis of these results of observation, we seek to interpret and model the observed variation of mare/highland abundance through the use of a mathematical model that can quantitatively reproduce spatial distributions and the absolute concentrations of 'exotic' components on the mare or highland side. In this analysis, we use a nonlinear model, which is more accurate for the intimate mixing expected in lunar surface. On the basis of nonlinear spectral mixing analysis, two critical issues are clarified: (1) there are apparently two distinct mixing zones, one near the contact that is very steep (5-15 percent/km) the other far from the contact that is very gentle (below 2 percent/km); (2) the distribution of mare and highland across the contact is remarkably symmetric.

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