Anorthosite and Olivine Layers of the Farside Upper Crust at Tsiolkovsky

Mathematics – Logic

Scientific paper

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Anorthosites, Clementine, Crust: Evolution, Troctolite, Tsiolkovsky

Scientific paper

Clementine multispectral image mosaics for the farside crater Tsiolkovsky have been calibrated and processed (116 five-color frame sets). Calibrated 5-color spectra at Tsiolkovsky are used to identify several distinct lithologic compositions known from lunar samples: anorthosite, olivine-rich troctolite, noritic anorthosite, and low-titanium basalt. Using Tsiolkovsky multispectral images as a guide to context and lithologic diversity, the compositional information implied by the 5-color spectra provide areas insight into the structure of the farside upper crust. The dominant rock type of the walls of Tsiolkovsky and the surrounding megaregolith (as excavated by small craters) is anorthosite. Tsiolkovsky central peaks, however, exhibit distinct layers of anorthosite and a lithology dominated by olivine. Either Tsiolkovsky, and other craters that exhibit similar compositional complexity, have fortuitously impacted into localized pockets or layers of lithologic diversity, or such compositional diversity is common in the highland crust between 5-3.0 km.

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