Bagnold Dunes Campaign Phase 2: Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands

Johnson, Jeffrey R.; Bell, III, James F.; Bender, Steve; Cloutis, Edward; Ehlmann, Bethany; Fraeman, Abigail; Gasnault, Olivier; Maurice, Sylvestre; Pinet, Patrick; Thompson, Lucy; Wellington, Danika; Wiens, Roger Craig

doi:10.1029/2018GL079025

Title: Bagnold Dunes Campaign Phase 2: Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands

Abstract

As part of the Phase 2 Bagnold Dune campaign at Gale Crater, Mars, constraints on the geochemistry, mineralogy, and oxidation state of pristine and disturbed linear sand ripples were made using visible/near–infrared spectral observations for comparison to Phase 1 spectra of the barchan dunes to the north. Spectra acquired by the ChemCam and Mastcam instruments (400–1,000 nm) at four Phase 2 locations revealed similar overall spectral trends between the two regions, but most Phase 2 sands were redder in the visible wavelengths. The majority of targets exhibited lower red/infrared ratios, higher ~530–nm band depths, and higher red/blue ratios than Phase 1 samples, suggesting a greater proportion of redder, fine–grained, ferric sands in Phase 2 samples. Here, this is consistent with the slightly greater proportion of hematite in Phase 2 samples as determined from CheMin analyses of the Ogunquit sands, which may reflect contamination from the surrounding hematite–bearing Murray formation bedrock.

Authors:

^[1];

^[2]; Bender, Steve ^[3];

^[4];

^[5];

^[6];

^[7]; Maurice, Sylvestre ^[7];

^[7];

^[8]; Wellington, Danika ^[2];

^[9]

The Johns Hopkins Univ. Applied Physics Lab., Laurel, MD (United States)
Arizona State Univ., Tempe, AZ (United States)
Planetary Science Institute, Tucson, AZ (United States)
Univ. of Winnipeg, Winnipeg, MB (Canada)
Jet Propulsion Laboratory, Pasadena, CA (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
Jet Propulsion Laboratory, Pasadena, CA (United States)
Univ. de Toulouse, Toulouse (France)
Univ. of New Brunswick, Fredericton, NB (Canada)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: Mon Jul 23 00:00:00 EDT 2018

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: National Aeronautics and Space Administration (NASA); USDOE

OSTI Identifier:: 1508549

Report Number(s):: LA-UR-18-28844
Journal ID: ISSN 0094-8276

Grant/Contract Number:: 89233218CNA000001

Resource Type:: Accepted Manuscript

Journal Name:: Geophysical Research Letters

Additional Journal Information:: Journal Volume: 45; Journal Issue: 18; Journal ID: ISSN 0094-8276

Publisher:: American Geophysical Union

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; Planetary Sciences

Citation Formats


                    Johnson, Jeffrey R., Bell, III, James F., Bender, Steve, Cloutis, Edward, Ehlmann, Bethany, Fraeman, Abigail, Gasnault, Olivier, Maurice, Sylvestre, Pinet, Patrick, Thompson, Lucy, Wellington, Danika, and Wiens, Roger Craig. Bagnold Dunes Campaign Phase 2: Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands.  United States: N. p., 2018. 
Web.  doi:10.1029/2018GL079025.

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                    Johnson, Jeffrey R., Bell, III, James F., Bender, Steve, Cloutis, Edward, Ehlmann, Bethany, Fraeman, Abigail, Gasnault, Olivier, Maurice, Sylvestre, Pinet, Patrick, Thompson, Lucy, Wellington, Danika, & Wiens, Roger Craig. Bagnold Dunes Campaign Phase 2: Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands.  United States.  https://doi.org/10.1029/2018GL079025

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                    Johnson, Jeffrey R., Bell, III, James F., Bender, Steve, Cloutis, Edward, Ehlmann, Bethany, Fraeman, Abigail, Gasnault, Olivier, Maurice, Sylvestre, Pinet, Patrick, Thompson, Lucy, Wellington, Danika, and Wiens, Roger Craig. Mon .  
"Bagnold Dunes Campaign Phase 2: Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands".  United States.  https://doi.org/10.1029/2018GL079025.  https://www.osti.gov/servlets/purl/1508549.

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@article{osti_1508549,

  title        = {Bagnold Dunes Campaign Phase 2: Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands},

  author       = {Johnson, Jeffrey R. and Bell, III, James F. and Bender, Steve and Cloutis, Edward and Ehlmann, Bethany and Fraeman, Abigail and Gasnault, Olivier and Maurice, Sylvestre and Pinet, Patrick and Thompson, Lucy and Wellington, Danika and Wiens, Roger Craig},

  abstractNote = {As part of the Phase 2 Bagnold Dune campaign at Gale Crater, Mars, constraints on the geochemistry, mineralogy, and oxidation state of pristine and disturbed linear sand ripples were made using visible/near–infrared spectral observations for comparison to Phase 1 spectra of the barchan dunes to the north. Spectra acquired by the ChemCam and Mastcam instruments (400–1,000 nm) at four Phase 2 locations revealed similar overall spectral trends between the two regions, but most Phase 2 sands were redder in the visible wavelengths. The majority of targets exhibited lower red/infrared ratios, higher ~530–nm band depths, and higher red/blue ratios than Phase 1 samples, suggesting a greater proportion of redder, fine–grained, ferric sands in Phase 2 samples. Here, this is consistent with the slightly greater proportion of hematite in Phase 2 samples as determined from CheMin analyses of the Ogunquit sands, which may reflect contamination from the surrounding hematite–bearing Murray formation bedrock.},

  doi          = {10.1029/2018GL079025},

  journal      = {Geophysical Research Letters},

  number       = 18,

  volume       = 45,

  place        = {United States},

  year         = {Mon Jul 23 00:00:00 EDT 2018},

  month        = {Mon Jul 23 00:00:00 EDT 2018}

}

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Title: Bagnold Dunes Campaign Phase 2: Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands

Abstract

Citation Formats

Visible to near-infrared MSL/Mastcam multispectral imaging: Initial results from select high-interest science targets within Gale Crater, Mars journal, June 2017

Major Volatiles Evolved From Eolian Materials in Gale Crater journal, October 2018

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