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Title: Basalt-trachybasalt samples in Gale Crater, Mars

Journal Article · · Meteoritics and Planetary Science
DOI:https://doi.org/10.1111/maps.12953· OSTI ID:1412898
 [1]; ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [5]; ORCiD logo [6]; ORCiD logo [2];  [7];  [8];  [9];  [1]
  1. Univ. of Leicester (United Kingdom). Leicester Inst. for Space and Earth Observation, Dept. of Physics and Astronomy
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. U.S. Geological Survey, Flagstaff, AZ (United States). Astrogeology Science Center
  4. Mount Holyoke College, South Hadley, MA (United States). Mineral Spectroscopy Lab.
  5. Oregon State Univ., Corvallis, OR (United States). College of Earth, Ocean, and Atmospheric Sciences
  6. Univ. of New Brunswick, Fredericton NB (Canada). Planetary and Space Science Centre
  7. Southern Illinois Univ., Carbondale, IL (United States). Geology Dept.
  8. Open Univ., Milton Keynes (United Kingdom). Dept. of Environment, Earth and Ecosystems
  9. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.

The ChemCam instrument on the Mars Science Laboratory (MSL) rover, Curiosity, observed numerous igneous float rocks and conglomerate clasts, reported previously. A new statistical analysis of single-laser-shot spectra of igneous targets observed by ChemCam shows a strong peak at ~55 wt% SiO2 and 6 wt% total alkalis, with a minor secondary maximum at 47–51 wt% SiO2 and lower alkali content. The centers of these distributions, together with the rock textures, indicate that many of the ChemCam igneous targets are trachybasalts, Mg# = 27 but with a secondary concentration of basaltic material, with a focus of compositions around Mg# = 54. We suggest that all of these igneous rocks resulted from low-pressure, olivine-dominated fractionation of Adirondack (MER) class-type basalt compositions. This magmatism has subalkaline, tholeiitic affinities. The similarity of the basalt endmember to much of the Gale sediment compositions in the first 1000 sols of the MSL mission suggests that this type of Fe-rich, relatively low-Mg#, olivine tholeiite is the dominant constituent of the Gale catchment that is the source material for the fine-grained sediments in Gale. The similarity to many Gusev igneous compositions suggests that it is a major constituent of ancient Martian magmas, and distinct from the shergottite parental melts thought to be associated with Tharsis and the Northern Lowlands. Finally, the Gale Crater catchment sampled a mixture of this tholeiitic basalt along with alkaline igneous material, together giving some analogies to terrestrial intraplate magmatic provinces.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE; UKSA
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1412898
Report Number(s):
LA-UR-17-27681; TRN: US1800404
Journal Information:
Meteoritics and Planetary Science, Vol. 52, Issue 11; ISSN 1086-9379
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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