Lunar Mare Basalt Volcanism: Stratigraphy, Flux, and Implications for Petrogenetic Evolution

Physics

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Basalt, Lunar Maria, Magma, Lunar Crust, Selenology, Lunar Evolution, Lunar Mantle, Volcanology, Stratigraphy, Clementine Spacecraft, Imaging Techniques, Lunar Prospector

Scientific paper

Lunar mare basalt deposits are an example of a vertically accreting secondary crust (derived from partial melting of planetary mantles) superposed on a platform of primary crust (derived from accretional and related heating). The small total area covered by mare deposits (about 17% of the surface) and the small volume (about 1 x 107 km3) are such that the stratigraphy, fluxes, and modes of emplacement can be documented and studied, particularly with the availability of Clementine multispectral imaging, complementary Apollo and Luna sample collections [e.g., 4-6], and Lunar Prospector data. These data can then be used to test models for the origin, ascent, and eruption of basaltic magmas, and to document the early stages of secondary crustal formation and evolution. The topic of this contribution is a synthesis of the emerging new stratigraphy, estimates of flux, an analysis of outstanding problems, and emerging constraints on petrogenetic models for generation and emplacement of secondary crustal magmas.

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