Figure 1

Fig. 1. Global maps of pyroxene (top) and anhydrous nanophase ferric oxides (bottom), exhibiting the anticorrelation between surface mafics and altered minerals (in the form of ferric oxides). The cratered crust with large pyroxene content (top, yellow to red) is not covered with altered minerals (bottom, blue to green). Conversely, the large areas with no mafics (top, blue) correspond to the higher concentration of ferric oxides (bottom, red to white). [View Larger Version of this Image (273K JPEG file)]

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