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

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

Research output: Contribution to journalArticle

6 Citations (Scopus)

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. 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.

Original languageEnglish (US)
JournalGeophysical Research Letters
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

dunes
ripple
ripples
sands
dune
reflectance
near infrared
spectroscopy
sand
hematite
proportion
Mars craters
barchan
bedrock
mineralogy
geochemistry
crater
Mars
contamination
wavelength

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Bagnold Dunes Campaign Phase 2 : Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands. / Johnson, Jeffrey R.; Bell, James; Bender, Steve; Cloutis, Edward; Ehlmann, Bethany; Fraeman, Abigail; Gasnault, Olivier; Maurice, Sylvestre; Pinet, Patrick; Thompson, Lucy; Wellington, Danika; Wiens, Roger C.

In: Geophysical Research Letters, 01.01.2018.

Research output: Contribution to journalArticle

Johnson, JR, Bell, J, Bender, S, Cloutis, E, Ehlmann, B, Fraeman, A, Gasnault, O, Maurice, S, Pinet, P, Thompson, L, Wellington, D & Wiens, RC 2018, 'Bagnold Dunes Campaign Phase 2: Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands', Geophysical Research Letters. https://doi.org/10.1029/2018GL079025
Johnson, Jeffrey R. ; Bell, James ; Bender, Steve ; Cloutis, Edward ; Ehlmann, Bethany ; Fraeman, Abigail ; Gasnault, Olivier ; Maurice, Sylvestre ; Pinet, Patrick ; Thompson, Lucy ; Wellington, Danika ; Wiens, Roger C. / Bagnold Dunes Campaign Phase 2 : Visible/Near-Infrared Reflectance Spectroscopy of Longitudinal Ripple Sands. In: Geophysical Research Letters. 2018.
@article{f8aaddc1305f4a9595a83850b8fd56c8,
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. 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.",
author = "Johnson, {Jeffrey R.} and James Bell and Steve Bender and Edward Cloutis and Bethany Ehlmann and Abigail Fraeman and Olivier Gasnault and Sylvestre Maurice and Patrick Pinet and Lucy Thompson and Danika Wellington and Wiens, {Roger C.}",
year = "2018",
month = "1",
day = "1",
doi = "10.1029/2018GL079025",
language = "English (US)",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",

}

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

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.

PY - 2018/1/1

Y1 - 2018/1/1

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.

UR - http://www.scopus.com/inward/record.url?scp=85053679453&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85053679453&partnerID=8YFLogxK

U2 - 10.1029/2018GL079025

DO - 10.1029/2018GL079025

M3 - Article

AN - SCOPUS:85053679453

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

ER -