TY - JOUR
T1 - Bagnold Dunes Campaign Phase 2
T2 - Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands
AU - Johnson, Jeffrey R.
AU - Bell, James F.
AU - Bender, Steve
AU - Cloutis, Edward
AU - Ehlmann, Bethany
AU - Fraeman, Abigail
AU - Gasnault, Olivier
AU - Maurice, Sylvestre
AU - Pinet, Patrick
AU - Thompson, Lucy
AU - Wellington, Danika
AU - Wiens, Roger C.
N1 - Funding Information:
This work was funded by the NASA Mars Science Laboratory Participating Scientist program through the Jet Propulsion Laboratory (contracts 1350588 and 1546033). A portion of this research was carried out at JPL, under a contract with NASA. The U.S. portion of ChemCam and MSL rover operations was funded by NASA's Mars Exploration Program. The French contribution to MSL is supported by CNES. The authors thank the operations teams involved in acquiring these data sets and W. Farrand and an anonymous reviewer for their helpful comments. Original data that underlie the conclusions presented in this manuscript can be found on the NASA Planetary Data System and/or in the relevant references cited. The authors fondly recall the dedicated efforts toward the Bagnold Dune campaigns by our late colleague Nathan Bridges.
Funding Information:
This work was funded by the NASA Mars Science Laboratory Participating Scientist program through the Jet Propulsion Laboratory (contracts 1350588 and 1546033). A portion of this research was carried out at JPL, under a contract with NASA. The U.S. portion of ChemCam and MSL rover operations was funded by NASA’s Mars Exploration Program. The French contribution to MSL is supported by CNES. The authors thank the operations teams involved in acquiring these data sets and W. Farrand and an anonymous reviewer for their helpful comments. Original data that underlie the conclusions presented in this manuscript can be found on the NASA Planetary Data System and/or in the relevant references cited. The authors fondly recall the dedicated efforts toward the Bagnold Dune campaigns by our late colleague Nathan Bridges.
Publisher Copyright:
©2018. American Geophysical Union. All Rights Reserved.
PY - 2018/9/28
Y1 - 2018/9/28
N2 - 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. 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.
AB - 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. 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.
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U2 - 10.1029/2018GL079025
DO - 10.1029/2018GL079025
M3 - Article
AN - SCOPUS:85053679453
SN - 0094-8276
VL - 45
SP - 9480
EP - 9487
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 18
ER -