Are Carbonates Hiding Among Mars’s Ferromagnesian Clays? - Supporting Dataset

This repository contains the supporting materials associated with Brossier et al. (202x), in preparation for publication with a journal (DOI) - it includes:<b>CARB_sites</b> (shapefiles and auxiliary files) – Each point represents a CRISM targeted cube analyzed in the survey and includes attributes such as label, year of collection, absorption band centers and two indexes (as defined in Table S1).<b>Table S1</b><b> </b>– This table lists all the cubes examined in this survey, along with key information including their labels, coordinates (center longitudes, latitudes), acquisition dates, targeted regions, number of pixels composing the regions of interest (ROIs), and identified mineralogical phase(s). For cubes showing clear carbonate signatures, absorption band centers and depths at 2.3, 2.5 and 3.5 µm are reported. We also include two indexes used for the mapping classification, as follows:Carb1 index (identification of the 2.5 µm band) on 543 cubes"0" None (BD25 &lt; 0.3%)"1" Weak (BD25 : 0.3-1%)"2" Moderate (BD25 : 1-2%)"3" Strong (BD25 &gt; 2%)Carb2 index (identification of the 3.5 µm band) on 418 cubes"1" None (noise level)"2" Tentative (BD35 &lt; 0.3%)"3" Present (BD35 &gt; 0.3%)<b>Table S2</b><b> </b>– This table compiles all terrestrial carbonate analogues used in this study. Most analogues are taken from Bishop et al. (2021) (doi: 10.1029/2021EA001844), while the four Fe-Mg carbonates are from Beck et al. (2024) (doi: 10.1029/2024EA003666).<b>Figure S1</b><b> </b>– Index maps highlighting the presence of carbonates and their co-occurrence with ferromagnesian clays.<i>D2300</i>: Drop of reflectance near 2.3 μm (ferromagnesian clays, and some carbonates)<i>FeSlope</i>: Upward slope from 1.1 to 1.8 μm (ferrous component such as smectites, carbonates or even olivine)<i>HdSlope</i>: Downward slope from 2.1 to 2.5 μm (hydrated minerals such as smectites, carbonates, sulfates, and chlorites)<i>BD3900</i>: Bulge-like feature centered near 3.6-3.7 μm due to double absorptions at 3.4-3.5 μm and near 3.9 μm (only carbonates)<br>