Characteristics of Individual Eruptive Events on the Lunar Western Limb and Farside: Implications for Magma Ascent and Eruption Mechanisms

Details Characteristics of Individual Eruptive Events on the Lunar Western Limb and Farside: Implications for Magma Ascent and Eruption Mechanisms Characteristics of Individual Eruptive Events on the Lunar Western Limb and Farside: Implications for Magma Ascent and Eruption Mechanisms

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1477y&link_type=abstract

Lunar and Planetary Science, volume 27, page 1477

Physics

Lava Ponds, Mare, Orientale: Mendel-Rydberg Basins, South Pole: Aitken Basin, Volcanism

Scientific paper

The connection between lunar magma source regions and the location and emplacement conditions of volcanic surface features remains unclear, both conceptually and quantitatively with respect to our understanding of transport mechanisms. Investigation of these issues requires use of surface feature characteristics to reconstruct the conditions of transport and eruption, so that thermal evolution models may be tested. Specifically, mare deposits are asymmetrically distributed over the lunar surface, with the nearside displaying the vast majority of surface basalts. Apollo and recent Clementine data have confirmed a dichotomy between the nearside and the farside with respect to crustal thickness. This implies a possible relationship between the efficiency of magma transport and the amount of crust through which magma must pass. It has been suggested that mare emplacement has been controlled by propagation of dikes driven by the overpressurization of diapir-like source regions stalled below the cooling lunar highland crust. Thus, regions of thinner crust would be expected to allow a greater number of dikes to reach the surface under the same source region conditions, than areas with thicker crust. Recent analyses of the characteristics of lava ponds in the South Pole/Aitken and Orientale/Mendel-Rydberg basins based on Clementine, Lunar Orbiter and Zond data have provided evidence that supports this theory.

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