Figure 1.

Overview of Jezero crater carbonate‐bearing rocks. (a) RPEAK1 parameter map of CRISM Multispectral TRDR image mosaic, which corresponds to presence of ferric (red color) and ferrous (blue color) Fe. Ferric iron is attributed to presence of martian dust, which occludes spectral signals in the visible‐to‐near‐infrared wavelengths measured by CRISM. The western region of Jezero crater has lower dust coverage, and therefore is less spectrally dominated by dust. (b) Carbonate‐bearing rocks are present in the delta truncated curvilinear layered, delta blocky, and undifferentiated smooth units (8), the delta layered rough unit (3), the crater floor fractured 2 unit (2), and the margin fractured unit and proximal large aeolian bedforms (4–7) described in Stack et al. (2020). Silica‐bearing material (1) is identified in newly discovered outcrops of the smooth dark‐toned material described in Tarnas et al. (2019). The combined footprints of CRISM images HRL000040FF and FRT000047A3 are shown as black lines. The regions of interest from which these spectra were extracted are analyzed in greater detail in Figures 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 and Figures S1–S12 in Supporting Information S1. CTX mosaic from Dickson et al. (2020). The colors show the pixels from which the spectra shown in panel (c) were extracted. Colors and numbers correlate between panels (b) and (c). (c) Library spectra (black) compared to spectra from the University of Massachusetts at Amherst processed CRISM data shown with (bottom) and without (top) continuum removal. RELAB IDs for the library spectra are CACB08, CABE256, CACB03, 397S013, C1SA51, C1RM34, and C1DH07, and these same library spectra are used in Figures 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, and 18; Figures S1–S10, and S12 in Supporting Information S1.