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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

DOI 10.1029/jb087ib12p10059

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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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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)
ORCID: Clark, Benton C.
Weldon, Ray J.
Schnabel, Lorraine
Venue: Journal of Geophysical Research: Solid Earth
Publisher: American Geophysical Union (AGU)
Published: 1982-01
Volume: 87
Issue: B12
Pages: 10059-10067
ISSN: 0148-0227 (ISSN-L)
DOI: 10.1029/jb087ib12p10059
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
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor, 11220 d)
Locations: Journal of Geophysical Research Atmospheres (publishedVersion)
Topics: Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Planetary Science and Exploration
Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › 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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Chemical composition of Martian fines

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