Figure 9.

Carbonate, phyllosilicate, and olivine‐bearing crater floor fractured 2 unit bedrock. (a) THEMIS thermal inertia map from Edwards and Buz (2021) covering region of interest, coregistered to CTX and HiRISE mosaics by Dickson et al. (2020). Colors correspond to more consolidated (warmer colors) and less consolidated (cooler colors) materials. (b) CRISM pixels (purple) on HiRISE image from which the spectra shown in panel (e) are derived. The CRISM pixels were selected based on THEMIS thermal inertia and HiRISE data to cover bedrock in the crater floor fractured 2 unit. (c) Enlarged view of a ridge in the crater floor fractured 2 unit (Stack et al., 2020). (d) Enlarged view of rubbly bedrock in the crater floor fractured 2 unit. (e) Spectra from UMass, TRR3, and TER processed CRISM data (purple) extracted from the pixels shown in panel (b) and compared to laboratory spectra (black). The spectra are consistent with the presence of carbonate‐bearing rock based on the presence of 2.3 and 2.5 μm features. The ratio of 2.3/2.5 μm band depth and narrow shape of the 2.3 μm feature are also consistent with the presence of phyllosilicate‐bearing rock. The absorption at 2.2 μm, which combines with the 2.3 μm absorption to create a broad band, is consistent with the presence of hydrated silica and/or Al‐phyllosilicate. The absorption centered at 1.0 μm is consistent with the presence of olivine, which is widespread throughout this unit.