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. Author manuscript; available in PMC: 2021 Aug 20.
Published in final edited form as: J Geophys Res Planets. 2020 Mar 10;125(7):e2019JE006190. doi: 10.1029/2019je006190

Figure 8.

Figure 8.

(a) CRISM spectra from regions of interest of geological units defined in this study. Black lines indicate the Fe/Mg-OH-related and the Al-OH-related vibrational absorption features. The blue, green, and purple dashed line indicates the position of the centroid for the Blue Fractured Unit (BFU), LCP-bearing Plateaus Unit (LPU), and Mixed Lithology Plains Unit (MLPU) respectively. Note the different character of the Fe2+-related absorption in LCP related to BFU, MLPU, and LPU as well as presence/lack of hydration features. Spectra from Stratified Basement Unit, altered BFU, BFU, LPU, Fe/Mg-smectite-bearing MLPU, and Fe/Mg-smectite- and LCP-bearing MLPU are from Projected Image FRT00009D44 and have center coordinates of 20°2′55.47″N 73°41′31.01″E, 20°2′51.05″N 73°41′2.78″E, 20°4′23.90″N 73°40′42.78″E, 20°0′33.98″N 73°38′8.69″E, 20°2′42.20″N 73°38′25.15″E, and 20°6′7.80″N 73°41′22.78″E respectively. Spectrum of kaolinite-bearing bright materials from Projected Image FRT0000CBE5 has center coordinates of 17°14′19.11″N, 76°21′18.01″E. Spectrum of ridges from Projected Image FRT0001997C has center coordinate of 17°33′36.95″N, 76°41′23.28″E. (b) Examples in HiRISE or HiRISE color of each of the eight geological units, geomorphic features, and mineral deposit of the Noachian Basement defined in this study (Table 3). Stratified Basement Unit from ESP_019476_2005, Blue Fractured Unit from ESP_053655_1985, megabreccia from ESP_039625_1995, Fe/Mg-smectite Mounds Unit from ESP_015942_1980, MLPU from ESP_015942_1980, LPU from ESP_016153_2005, ridges from ESP_027691_2025, and kaolinite from PSP_010206_1975.