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:CARB_sites (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).Table S1 – 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 "1" Weak (BD25 : 0.3-1%)"2" Moderate (BD25 : 1-2%)"3" Strong (BD25 > 2%)Carb2 index (identification of the 3.5 µm band) on 418 cubes"1" None (noise level)"2" Tentative (BD35 "3" Present (BD35 > 0.3%)Table S2 – 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).Figure S1 – Index maps highlighting the presence of carbonates and their co-occurrence with ferromagnesian clays.D2300: Drop of reflectance near 2.3 μm (ferromagnesian clays, and some carbonates)FeSlope: Upward slope from 1.1 to 1.8 μm (ferrous component such as smectites, carbonates or even olivine)HdSlope: Downward slope from 2.1 to 2.5 μm (hydrated minerals such as smectites, carbonates, sulfates, and chlorites)BD3900: 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)本仓库收录了与Brossier等人（202x年）相关的支撑材料，该成果正准备投稿至学术期刊（DOI：待补充），涵盖内容如下： CARB_sites（shapefile格式文件及辅助文件）：每个点位对应本调研中分析的CRISM目标立方体（CRISM targeted cube），并附带标签、采集年份、吸收带中心以及两项指标（详见表S1）等属性。 表S1：本表格列出了本调研中所有被考察的立方体，及其关键信息，包括标签、坐标（中心经度、纬度）、采集日期、目标区域、感兴趣区域（Region of Interest，ROI）的像素总数，以及已识别的矿物相。对于呈现清晰碳酸盐信号的立方体，将报告其在2.3、2.5和3.5 μm处的吸收带中心与吸收深度。本次研究还包含两项用于制图分类的指标，具体如下： Carb1指标（用于识别2.5 μm吸收带），共覆盖543个立方体： "0" 无信号（BD25）；"1" 弱信号（BD25：0.3%~1%）；"2" 中等信号（BD25：1%~2%）；"3" 强信号（BD25>2%） Carb2指标（用于识别3.5 μm吸收带），共覆盖418个立方体： "1" 无信号（噪声水平）；"2" 疑似信号；"3" 存在信号（BD35>0.3%） 表S2：本表格汇总了本研究中使用的所有陆地碳酸盐类似物。大多数类似物取自Bishop等人（2021年）的研究（DOI：10.1029/2021EA001844），其中4种铁镁碳酸盐取自Beck等人（2024年）的研究（DOI：10.1029/2024EA003666）。 图S1：指标分布图，用于展示碳酸盐的赋存状态及其与铁镁粘土的共生关系。 D2300：2.3 μm附近的反射率下降特征（对应铁镁粘土及部分碳酸盐） FeSlope：1.1 μm至1.8 μm区间的上升斜率特征（对应亚铁组分，如蒙脱石、碳酸盐甚至橄榄石） HdSlope：2.1 μm至2.5 μm区间的下降斜率特征（对应水化矿物，如蒙脱石、碳酸盐、硫酸盐及绿泥石） BD3900：因3.4~3.5 μm与3.9 μm附近的双重吸收形成的、中心位于3.6~3.7 μm附近的凸起特征（仅见于碳酸盐）