Ferromagnesian Clay Diversity across Mars’ Crustal Dichotomy: A Window into Early Aqueous Environments - Supporting Datasets

This repository contains the supporting materials associated with Brossier et al. (202x), in preparation for publication with JGR Planets (DOI) - it includes:<b>CRISM_points</b> (shapefiles and auxiliary files) – Each point represents a cube analyzed in the survey and includes attributes such as label, year of collection, mineralogical index (as defined in Table S1), and information on the presence and type of ferromagnesian clays.Presence of clays:"Yes" - Clear and confident detection of ferromagnesian clays"Tentative" - Possible presence of clays, but signatures are weak, poorly resolved or simply ambiguous."Others" - No clays detected, but other mineralogical phases are clearly present"None" - No mineralogical detections<b>Table S1 </b>– This table lists all the cubes analyzed in this survey, along with key information including label, coordinates, collection date, targeted region, mineralogical phase(s). For cubes showing distinct signatures of ferromagnesian clays, additional data are given, such as absorption band centers (at 1.4, 2.3, and 2.4 um) and the corresponding clay type (nontronites, saponites, or even intermediate phases).Mineralogical phases are characterized using the following index (0 to 10):0. No detection1. FeMg-rich clays2. FeMg-rich clays &amp; Al-rich phases3. Sulfates4. FeMg-rich clays &amp; Sulfates5. Chlorites or prehnites6. Al-rich phases (clays, kaolins)7. Sulfates &amp; Al-rich phases8. FeMg-rich clays, Al-rich phases &amp; Sulfates9. Possible carbonates10. Hydrated silicaFerromagnesian clay types:"NON" - Nontronites"SAP" - Saponites"INT" - Intermediate phases (e.g., vermiculites, ferrosaponites)"NA" - Not Applied (for noisy cubes)<b>Figure S1 </b>– Global map of Mars displaying the colorized dust cover index (from OMEGA/Mars Express) and the distribution of hydrated minerals along the crustal dichotomy, based on our survey of almost 1,400 CRISM cubes. Most observations and detections are concentrated regions with relatively low dust cover.<b>Figure S2 </b>– Examples of spectra of the CRISM denoised reflectance for a range of hydrated minerals identified during the survey, shown alongside laboratory reference spectra of candidate minerals from the RELAB spectral bundle.<b>Figure S3</b> – Maps of selected CRISM cubes displaying the various hydrated mineral deposits from which we extract the average spectra shown in Figure S2.