Global geologic context for Mars geochemistry

Geologic data for asteroid 4 Vesta, (a) Spectral map of a part of the surface of Vesta as it rotates, showing the distribution of HED-like lithologies, modified from Binzel et at. (1997). (b) Interpretive geologic cross-section of Vesta, illustrating how HED meteorites might be distributed in the interior, 

Illustration of the different ages and thicknesses of major parts of the Martian crust. 

The best available source for details about Mars geology is The Surface of Mars (Carr, 2006). Solomon et al. (2005) provided an excellent review of the geological evolution of Mars, and various chapters in The Martian Surface Composition, Mineralogy, and Physical Properties (Bell, 2008) give up-to-date summaries of Mars geochemistry. 

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