CRISM: Carbonate and phyllosilicates in Leighton Crater

This image shows alteration products in the central peak of Leighton Crater, a 65-kilometer diameter crater in the Tyrrhena Terra region of the southern highlands. This CRISM image reveals the presence of hydrated iron-magnesium phyllosilicate and carbonate minerals (shown in magenta and blue) around the central peak. Phyllosilicates, which include clay and clay-like minerals, form from the chemical reaction of water with igneous rocks. Carbonates form where carbon dioxide combines…. [More at link]