Title: Spectral, Compositional, and Physical Properties of the Upper Murray Formation and Vera Rubin Ridge, Gale Crater, Mars

Abstract

During 2018 and 2019, the Mars Science Laboratory Curiosity rover investigated the chemistry, morphology, and stratigraphy of Vera Rubin ridge (VRR). Using orbital data from the Compact Reconnaissance Imaging Spectrometer for Mars, scientists attributed the strong 860 nm signal associated with VRR to the presence of red crystalline hematite. However, Mastcam multispectral data and CheMin X-ray diffraction (XRD) measurements show that the depth of the 860 nm absorption is negatively correlated with the abundance of red crystalline hematite, suggesting that other mineralogical or physical parameters are also controlling the 860 nm absorption. Here, we examine Mastcam and ChemCam passive reflectance spectra from VRR and other locations to link the depth, position, and presence or absence of iron-related mineralogic absorption features to the XRD-derived rock mineralogy. Correlating CheMin mineralogy to spectral parameters showed that the ~860 nm absorption has a strong positive correlation with the abundance of ferric phyllosilicates. New laboratory reflectance measurements of powdered mineral mixtures can reproduce trends found in Gale crater. We hypothesize that variations in the 860 nm absorption feature in Mastcam and ChemCam observations of VRR materials are a result of three factors: (1) variations in ferric phyllosilicate abundance due to its ~800–1,000 nm absorption; (2)more » variations in clinopyroxene abundance because of its band maximum at ~860 nm; and (3) the presence of red crystalline hematite because of its absorption centered at 860 nm. We also show that relatively small changes in Ca-sulfate abundance is one potential cause of the erosional resistance and geomorphic expression of VRR.« less

Authors:

Jacob, S. R.  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-9950-1486"

Wellington, D. F.  ^[1];

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Bell III, James F.  ^[1];

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Achilles, Cherie N.  ^[2];

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Fraeman, Abigail A.  ^[3];

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Horgan, B.  ^[4];

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Johnson, Jeffrey R.  ^[5];

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Maurice, Sylvestre ^[6]; Peters, G. H.  ^[7];

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Rampe, E. B.  ^[8];

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Thompson, L. M.  ^[9];

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Wiens, Roger Craig  ^[10]

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• Search DOE PAGES for ORCID "0000-0002-3409-7344"

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+ Show Author Affiliations

1. Arizona State Univ., Tempe, AZ (United States)
2. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
3. California Inst. of Technology (CalTech), Pasadena, CA (United States)
4. Purdue Univ., West Lafayette, IN (United States)
5. Johns Hopkins Univ., Baltimore, MD (United States)
6. Institut de Recherche en Astrophysique et Planetologie, Toulouse (France)
7. NASA Neil A. Armstrong Flight Research Center, Edwards, CA (United States)
8. NASA Johnson Space Center, Houston, TX (United States)
9. Univ. of New Brunswick, Fredericton NB (Canada)
10. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:

Fri Aug 28 00:00:00 EDT 2020

Research Org.:

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)

OSTI Identifier:

1760573

Report Number(s):

LA-UR-19-32335
Journal ID: ISSN 2169-9097

Grant/Contract Number:  

89233218CNA000001; 1546033

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Geophysical Research. Planets

Additional Journal Information:

Journal Volume: 125; Journal Issue: 11; Journal ID: ISSN 2169-9097

Publisher:

American Geophysical Union

Country of Publication:

United States

Language:

English

Subject:

58 GEOSCIENCES; Planetary Sciences; Mastcam; multispectral; laboratory; phyllosilicates; hematite; ferric iron