Expanded Insights into Martian Mineralogy: Updated Analysis of Gale Crater’s Mineral Composition via CheMin Crystal Chemical Investigations
Shaunna M. Morrison, D. F. Blake, T. F. Bristow, Nicholas Castle, S. J. Chipera, Patricia Craig, Robert T. Downs, Ahmed Eleish, Robert M. Hazen, Johannes M. Meusburger, D. W. Ming, R. V. Morris, Aditi Pandey, Anirudh Prabhu, E. B. Rampe, P. Sarrazin, Sarah Simpson, M. T. Thorpe, A. H. Treiman, Valerie Tu, Benjamin M. Tutolo, D. T. Vaniman, A. R. Vasavada, A. S. Yen
Abstract
This study presents mineral composition estimates of rock and sediment samples analyzed with the CheMin X-ray diffraction instrument on board the NASA Mars Science Laboratory rover, Curiosity, in Gale crater, Mars. Mineral composition is estimated using crystal-chemically derived algorithms applied to X-ray diffraction data, specifically unit-cell parameters. The mineral groups characterized include those found in major abundance by the CheMin instrument (i.e., feldspar, olivine, pyroxene, and spinel oxide). In addition to estimating the composition of the major mineral phases observed in Gale crater, we place their compositions in a stratigraphic context and provide a comparison to that of martian meteorites. This work provides expanded insights into the mineralogy and chemistry of the martian surface.