Recalibration of the Mars Science Laboratory ChemCam instrument with an expanded geochemical database
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Recalibration of the Mars Science Laboratory ChemCam instrument with an expanded geochemical database. / Clegg, Samuel M.; Wiens, Roger C.; Anderson, Ryan B.; Forni, Olivier; Frydenvang, Jens; Lasue, Jeremie; Cousin, Agnes; Payre, Valerie; Boucher, Tommy; Dyar, M. Darby; McLennan, Scott M.; Morris, Richard V.; Graff, Trevor G.; Mertzman, Stanley A.; Ehlmann, Bethany L.; Belgacem, Ines; Newsom, Horton; Clark, Ben C.; Melikechi, Noureddine; Mezzacappa, Alissa; Mclnroy, Rhonda E.; Martinez, Ronald; Gasda, Patrick; Gasnault, Olivier; Maurice, Sylvestre.
In: Spectrochimica Acta Part B: Atomic Spectroscopy, Vol. 129, 01.03.2017, p. 64-85.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Recalibration of the Mars Science Laboratory ChemCam instrument with an expanded geochemical database
AU - Clegg, Samuel M.
AU - Wiens, Roger C.
AU - Anderson, Ryan B.
AU - Forni, Olivier
AU - Frydenvang, Jens
AU - Lasue, Jeremie
AU - Cousin, Agnes
AU - Payre, Valerie
AU - Boucher, Tommy
AU - Dyar, M. Darby
AU - McLennan, Scott M.
AU - Morris, Richard V.
AU - Graff, Trevor G.
AU - Mertzman, Stanley A.
AU - Ehlmann, Bethany L.
AU - Belgacem, Ines
AU - Newsom, Horton
AU - Clark, Ben C.
AU - Melikechi, Noureddine
AU - Mezzacappa, Alissa
AU - Mclnroy, Rhonda E.
AU - Martinez, Ronald
AU - Gasda, Patrick
AU - Gasnault, Olivier
AU - Maurice, Sylvestre
PY - 2017/3/1
Y1 - 2017/3/1
N2 - The ChemCam Laser-Induced Breakdown Spectroscopy (LIBS) instrument onboard the Mars Science Laboratory (MSL) rover Curiosity has obtained > 300,000 spectra of rock and soil analysis targets since landing at Gale Crater in 2012, and the, spectra represent perhaps the largest publicly-available LIBS datasets. The compositions of the major elements, reported as oxides (SiO2, TiO2, A1(2)O(3), FeOT, MgO, CaO, Na2O, K2O), have been re-calibrated using a laboratory LIBS instrument, Mars-like atmospheric conditions, and a much larger set of standards (408) that span a wider compositional range than previously employed. The new calibration uses a combination of partial least squares (PLS1) and Independent Component Analysis (ICA) algorithms, together with a calibration transfer matrix to minimize differences between the conditions under which the standards were analyzed in the laboratory and the conditions on Mars. While the previous model provided good results in the compositional range near the average Mars surface composition, the new model fits the extreme compositions far better. Examples are given for plagioclase feldspars, where silicon was significantly over-estimated by the previous model, and for calcium-sulfate veins, where silicon compositions near zero were inaccurate. The uncertainties of major element abundances are described as a function of the abundances, and are overall significantly lower than the previous model, enabling important new geochemical interpretations of the data. (C) 2017 Elsevier B.V. All rights reserved.
AB - The ChemCam Laser-Induced Breakdown Spectroscopy (LIBS) instrument onboard the Mars Science Laboratory (MSL) rover Curiosity has obtained > 300,000 spectra of rock and soil analysis targets since landing at Gale Crater in 2012, and the, spectra represent perhaps the largest publicly-available LIBS datasets. The compositions of the major elements, reported as oxides (SiO2, TiO2, A1(2)O(3), FeOT, MgO, CaO, Na2O, K2O), have been re-calibrated using a laboratory LIBS instrument, Mars-like atmospheric conditions, and a much larger set of standards (408) that span a wider compositional range than previously employed. The new calibration uses a combination of partial least squares (PLS1) and Independent Component Analysis (ICA) algorithms, together with a calibration transfer matrix to minimize differences between the conditions under which the standards were analyzed in the laboratory and the conditions on Mars. While the previous model provided good results in the compositional range near the average Mars surface composition, the new model fits the extreme compositions far better. Examples are given for plagioclase feldspars, where silicon was significantly over-estimated by the previous model, and for calcium-sulfate veins, where silicon compositions near zero were inaccurate. The uncertainties of major element abundances are described as a function of the abundances, and are overall significantly lower than the previous model, enabling important new geochemical interpretations of the data. (C) 2017 Elsevier B.V. All rights reserved.
KW - Laser-Induced Breakdown Spectroscopy
KW - ChemCam
KW - Mars Science Laboratory rover
KW - Curiosity rover
KW - Geochemistry
KW - Partial least squares
KW - Independent Components Analysis
KW - INDEPENDENT COMPONENT ANALYSIS
KW - EARTH-ELEMENT PATTERNS
KW - GALE CRATER EVIDENCE
KW - CRUSTAL EVOLUTION
KW - SEDIMENTARY-ROCKS
KW - YELLOWKNIFE BAY
KW - CURIOSITY ROVER
KW - CALIBRATION
KW - REGRESSION
KW - CHEMISTRY
U2 - 10.1016/j.sab.2016.12.003
DO - 10.1016/j.sab.2016.12.003
M3 - Journal article
VL - 129
SP - 64
EP - 85
JO - Spectrochimica Acta Part B: Atomic Spectroscopy
JF - Spectrochimica Acta Part B: Atomic Spectroscopy
SN - 0584-8547
ER -
ID: 317204389