Cited by 409Planetary Science and ExplorationAstro and Planetary ScienceGeochemistry and Elemental Analysis

Chemical composition of Martian fines

Clark, Benton C., Baird, Alex K., Weldon, Ray J., Tsusaki, Donald M., Schnabel, Lorraine, Candelaria, Magell P.·1982·Journal of Geophysical Research: Solid Earth

Abstract

Of the 21 samples acquired for the Viking X ray fluorescence spectrometer, 17 were analyzed to high precision. Compared to typical terrestrial continental soils and lunar mare fines, the Martian fines are lower in Al, higher in Fe, and much higher in S and Cl concentrations. Protected fines at the two lander sites are almost indistinguishable, but concentration of the element S is somewhat higher at Utopia. Duricrust fragments, successfully acquired only at the Chryse site, invariably contained about 50% higher S than fines. No elements correlate positively with S, except Cl and possibly Mg. A sympathetic variation is found among the triad Si, Al, Ca; positive correlation occurs between Ti and Fe. Sample variabilities are as great within a few meters as between lander locations (4500 km apart), implying the existence of a universal Martian regolith component of constant average composition. The nature of the source materials for the regolith fines must be mafic to ultramafic.

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Crossref · 10.1029/jb087ib12p10059

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Authors
Clark, B. C., Baird, A. K., Weldon, R. J., Tsusaki, D. M., Schnabel, L., & Candelaria, M. P.
Affiliations
  • Martin Marietta (United States) (US)
  • Pomona College (US)
Venue
Journal of Geophysical Research: Solid Earth
Published
1982-01
Volume
87
Issue
B12
Pages
10059-10067
ISSN
0148-0227 (ISSN-L)
OpenAlex
W2087792793
Cited by
409
References
25
Citations by year
2026: 8 · 2025: 13 · 2024: 6 · 2023: 9 · 2022: 15 · 2021: 10 · 2020: 3 · 2019: 7 · 2018: 8 · 2017: 5 · 2016: 3 · 2015: 9 · 2014: 14 · 2013: 18 · 2012: 8
FWCI
3.01
Type
journal article
Language
en
Open access
closed
Locations
Journal of Geophysical Research Atmospheres (publishedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
Martian regolith, chemical composition, Viking landers, X-ray fluorescence, sulfur, chlorine, iron, aluminum, duricrusts, Utopia Planitia, Chryse Planitia

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