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18 results for “ChemCam”
Gini index mean score grain size estimates for Murray formation rocks (Gale crater, Mars) from ChemCam LIBS data (sols 766-1804)
<p>This repository includes main research results from the Journal of Geophysical Research: Planets manuscript entitled <em>"Grain Size Variations in the Murray Formation: Stratigraphic Evidence for Changing Depositional Environments in Gale Crater, Mars"</em>. These datasets were also included as Supplementary tables with the manuscript. Please find the plain language summary of the manuscript and the captions for these datasets below:</p> <p><strong><em>Plain language summary:</em></strong> The lowest exposed rocks of the Murray formation in Gale crater, Mars are interpreted as ancient lake deposits based on <em>Curiosity </em>rover data. However, the duration and temporal variability of this ancient lake is still an open question. Here we characterize the vertical distribution of deposits within the entire Murray formation using new grain size information. Characterizing grain size in rocks provides information about the speed of past fluid flows, which is crucial for interpreting depositional environments. However, measuring grain size in images is rarely possible for martian rocks. Thus, we estimate grain sizes with the Gini Index Mean Score (GIMS), a grain-size proxy that uses ChemCam Laser Induced Breakdown Spectroscopy data. GIMS results indicate that the Murray formation is dominated by rocks with mud-sized grains (i.e., mudstones), suggesting mud-sized grain settled in a low energy lake environment. Mud cracks occur in some of the mudstones, indicating drying periods in a lake. Rocks with sand-sized grains (i.e., sandstones) and cross bedding occur at specific intervals, suggesting episodes with stream channels and wind-blown sand dunes. The dominance of lake deposits interspersed with stream deposits suggests that liquid water was present in Gale crater for tens of thousands to millions of years.</p> <p><strong>Table captions:</strong></p> <p><em>Table S3. </em>All Murray formation targets used in the Gini mean index score (GIMS) analysis (sols 766-1804) with summary information, general grain size estimates from MAHLI and RMI images if known, and G<sub>MEAN </sub>values with associated standard deviation errors. For targets with N/A grain sizes, grains could not be resolved in any of the images, or images were not available. Protrusions in the rocks that are not grains are likely diagenetic nodules or concretions. Targets with G<sub>MEAN</sub>=0.07 have transitional GSRs, indicated by GSR1/GSR2. Targets names are merged in the same cell for those analyses that were taken on the same rock exposure. Next to the target names, the symbol * denotes that the ChemCam target was imaged by the MAHLI, the symbol ** denotes that the dust removal tool was used before the MAHLI image was taken, and ~ signifies that a location close to the ChemCam target was imaged by the MAHLI.</p> <p><em>Table S4</em>. The mean, median, minimum and maximum G<sub>MEAN</sub> and the minimum and maximum grain size regime (GSR) for each locality in the Murray formation.</p>
Classification of ChemCam LIBS targets from Glen Torridon, Gale crater, Mars
<p>Point-by-point classification of all ChemCam LIBS targets in the Glen Torridon region (sols 2301 to 3007). The targets from the Greenheugh pediment are included for completeness, even though they are not studied in detail here (see Bedford et al., this issue). Columns 5 to 9 contain the geographic and stratigraphic locations of the targets. Columns 10 to 12 contain descriptions of the material that was sampled by the laser at each point, based on visual inspection of rover imagery. Column 13 indicates the quality of the data with respect to focus, based on the examination of the focus curves returned by the instrument each time an autofocus is performed (Peret et al., 2016): “poor” corresponds to a flat or noisy curve; “suboptimal” corresponds to a curve with a maximum at the edge of the range of distances scanned by the autofocus; and “uncertain” corresponds to points for which no focus curve is available, but that are likely out-of-focus given the local target topography visible in the RMI images of the target. Column 14 contains the spacecraft clock, which is unique to each row and enables identification and download of the associated spectra from the Planetary Data System (<a href="http://pds-geosciences.wustl.edu/missions/msl/">http://pds-geosciences.wustl.edu/missions/msl/</a>). Columns 15 to 42 contain the major-element oxide composition of each point, except for targets with poor focus or very high FeO<sub>T</sub> (e.g., iron meteorites), or located beyond 6 meters. Abundances are in wt%. The RMSEP (root mean squared error of prediction) reflects the model accuracy as detailed in Clegg et al. (2017). The “shots stdev” reflects the standard deviation across the laser shots (excluding the first 5). Columns 45 to 49 contain the corrected abundances for SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, Na<sub>2</sub>O and K<sub>2</sub>O, as well as the corrected sum of oxides, for targets beyond 3.5 m (Wiens et al., 2021). Column 50 contains the calculated value of the Chemical Index of Alteration. Abbreviations used: BH = Bloodstone hill; CB = Central butte; CBU = clay-bearing unit; LT = lateral traverse; MA = Mary Anning; TB = Tower butte; WB = Western butte.</p>
Dataset for the manuscript: "Elevated-Mn ChemCam Targets Illuminating Mn Redox Cycling and Diagenesis in the Bradbury Rise, Gale Crater, Mars"
<p><span>The dataset for the manuscript titled, “Elevated-Mn ChemCam Targets Illuminating Mn Redox Cycling and Diagenesis in the Bradbury Rise, Gale Crater, Mars” consists of a single CSV file. This CSV contains 1,539 rows, with one ChemCam observation point per row. The observation points in this file are from the ChemCam rock targets between martian solar days (sols) 1 and 600 of the MSL <em>Curiosity</em> rover mission that have at least one observation point with > 0.2 wt% MnO. Metadata and compositional data are provided for each row. The metadata includes the LIBS spectrum filename; the name of the target to which the observation point belongs; the class into which we grouped the target; the spacecraft clock value (timestamp) for the observation point; the sol on which the observation was taken; and the ChemCam sequence identifier; the observation point number within the sequence; the ChemCam-to-target distance (in meters); the laser power used for the LIBS measurements; the spectrum totals; and a binary column indicating whether the observation point has > 0.2 wt% MnO. The compositional data includes the oxide chemistry (oxide wt.%), RMSEP accuracy, and shot-to-shot standard deviation, for the major oxides SiO2, TiO2, Al2O3, FeOT, MgO, CaO, Na2O, K2O, as well as for MnO; the sum of oxides for each observation point is also provided.</span></p>
All ChemCam data and corrected Li data
<p>Supplementary data for JGR manuscript "Boron and Lithium in Calcium Sulfate Veins: Tracking Precipitation of Diagenetic Materials in Vera Rubin Ridge, Gale Crater". Excel files contain all LIBS data collected by the Curiosity rover between sol 1-2311 and corrected Li data for vein targets.</p>
Gini index mean score grain size estimates for Murray formation rocks in the Vera Rubin ridge (Gale crater, Mars) from ChemCam LIBS data (sols 1808-2298)
<p>Data in this repository are included as main research results in the Journal of Geophysical Research: Planets manuscripts entitled:</p> <p><em>"</em>Extensive diagenesis revealed by fine-scale features at Vera Rubin ridge, Gale crater, Mars<em>" </em></p> <p>"A lacustrine paleoenvironment recorded at Vera Rubin ridge, Gale crater: Overview of the sedimentology and stratigraphy observed by the Mars Science Laboratory Curiosity rover".</p> <p> </p> <p><strong>Table captions:</strong></p> <p><em>Table 1. </em>Murray formation targets from the Vera Rubin ridge used in the Gini mean index score (GIMS) analysis (sols 1808-2298) with summary information and G<sub>MEAN </sub>values with associated standard deviation errors. The grain size regimes (GSRs) were defined during the calibration procedure in Rivera-Hernández et al. (2020) and are defined as: mud (G<sub>MEAN</sub>=0.00-0.07; GSR1) and coarse silt to very fine sand (G<sub>MEAN</sub>=0.07-0.10; GSR2). Rocks with G<sub>MEAN</sub>=0.07 are exactly at GSR1 and GSR2 boundary and are reported as GSR1/GSR2. Next to the target names, the symbol * denotes that the ChemCam target was imaged by the Mars Hand Lens Imager (MAHLI), the symbol ** denotes that the dust removal tool was used before the MAHLI image was taken, and ~ signifies that a location close to the ChemCam target was imaged by the MAHLI. </p> <p><em>Table 2</em>. The mean, median, minimum and maximum G<sub>MEAN</sub> and the minimum and maximum grain size regime (GSR) for each Murray formation locality in the Vera Rubin ridge.</p> <p> </p> <p>References:</p> <p>Rivera-Hernández, F., Sumner, D. Y., Mangold N., Wiens, R.W., Edgett, K., Fedo, C., Schieber, J., Banham, S.G., Newsom, H., Gupta, S., Heydari, E., Stack, K.M., Nachon, M., Stein, N., & Maurice, S. (2020) Grain Size Variations in the Murray Formation: Stratigraphic Evidence for Changing Depositional Environments in Gale Crater, Mars. <em>Journal of Geophysical Research:</em><em> Planets.</em> doi:10.1029/2019JE006230</p>
Greenheugh capping unit ChemCam derived data products
<p>The ChemCam derived data products used in Bedford et al. (2022) "An insight into ancient aeolian processes and post-Noachian aqueous alteration in Gale crater; Mars, using ChemCam geochemical data from the Greenheugh capping unit."</p>
ChemCam data and corrected Li data
<p>Supplementary data for JGR manuscript "Boron and Lithium in Calcium Sulfate Veins: Tracking Precipitation of Diagenetic Materials in Vera Rubin Ridge, Gale Crater". Excel files contain all LIBS data collected by the Curiosity rover between sol 1-2311 and corrected Li data for vein targets.</p>
MSL MARS CHEMCAM LIBS SPECTRA 4/5 RDR V1.0
The MSL ChemCam LIBS RDR data set contains calibrated spectra and higher level products derived from raw data collected by the ChemCam Laser Induced Breakdown Spectrometer on the Mars Science Laboratory rover. Standard derived products include summed calibrated spectra (RDR), Intermediate Clean Calibrated Spectra (CCS), and Multivariate Prediction of Oxide Composition (MOC) tables. Special products, which may be generated as needed and as resources permit, are Univariate Prediction of Elemental Composition (UEC) tables, Univariate Prediction of Oxide Composition (UOC) tables, Multivariate Prediction of Elemental Composition (MEC) tables, and Sammon's Map (RSM) tables.
MSL MARS CHEMCAM REMOTE MICRO-IMAGER CAMERA 5 RDR V1.0
The MSL ChemCam RMI RDR data set consists of radiometrically and geometrically calibrated images acquired by the ChemCam Remote Micro-Imager on the Mars Science Laboratory rover.
MSL CHEMCAM LASER INDUCED BREAKDOWN SPECTROMETER EDR V1.0
The MSL ChemCam LIBS EDR data set consists of all uncalibrated data collected by the ChemCam Laser Induced Breakdown Spectrometer on the Mars Science Laboratory rover. These spectra measure the chemical content of the target samples.
MSL CHEMCAM REMOTE MICRO IMAGING CAMERA EDR V1.0
The MSL ChemCam RMI EDR data set consists of all uncalibrated data collected by the ChemCam Remote Micro-Imager on the Mars Science Laboratory rover. The imager software inherited from Rosetta includes autoexposure algorithms, with typically four different exposures made, and the best image is kept. For a typical rock analysis scenario a full 1024x1024 pixel image is taken prior to LIBS analysis, and an image of only the analysis spot (e.g., 128x128) is taken subsequent to analysis.
MSL CHEMCAM STATE OF HEALTH EDR V1.0
The MSL ChemCam SOH EDR data set consists of all raw state of health data collected by the ChemCam instrument on the Mars Science Laboratory rover.
MSL ChemCam Passive Surface Spectra Bundle
MSL ChemCam passive surface spectra bundle.
MSL CHEMCAM STATE OF HEALTH EDR V1.0
The MSL ChemCam SOH EDR data set consists of all raw state of health data collected by the ChemCam instrument on the Mars Science Laboratory rover.
MSL MARS CHEMCAM LIBS SPECTRA 4/5 RDR V1.0
The MSL ChemCam LIBS RDR data set contains calibrated spectra and higher level products derived from raw data collected by the ChemCam Laser Induced Breakdown Spectrometer on the Mars Science Laboratory rover. Standard derived products include summed calibrated spectra (RDR), CCS (Intermediate Clean Calibrated Spectra), and MOC (Multivariate Prediciton of Oxide Composition) tables. Special products, which may be generated as needed and as resources permit, are UEC (Univariate Prediction of Elemental Composition) tables, UOC (Univariate Prediction of Oxide Composition) tables, MEC (Multivariate Prediction of Elemental Composition) tables, and RSM (Sammon's Map) tables.
MSL MARS CHEMCAM REMOTE MICRO-IMAGER CAMERA 5 RDR V1.0
The MSL ChemCam RMI RDR data set consists of radiometrically and geometrically calibrated images acquired by the ChemCam Remote Micro-Imager on the Mars Science Laboratory rover.
MSL CHEMCAM REMOTE MICRO IMAGING CAMERA EDR V1.0
The MSL ChemCam RMI EDR data set consists of all uncalibrated data collected by the ChemCam Remote Micro-Imager on the Mars Science Laboratory rover. The imager software inherited from Rosetta includes autoexposure algorithms, with typically four different exposures made, and the best image is kept. For a typical rock analysis scenario a full 1024x1024 pixel image is taken prior to LIBS analysis, and an image of only the analysis spot (e.g., 128x128) is taken subsequent to analysis.
MSL CHEMCAM LASER INDUCED BREAKDOWN SPECTROMETER EDR V1.0
The MSL ChemCam LIBS EDR data set consists of all uncalibrated data collected by the ChemCam Laser Induced Breakdown Spectrometer on the Mars Science Laboratory rover. These spectra measure the chemical content of the target samples.
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