Extraction of compositional and hydration information of sulfates from laser-induced plasma spectra recorded under Mars atmospheric conditions — Implications for ChemCam investigations on Curiosity rover

Sobrón, P.; Wang, Alian; Sobrón, F.

doi:10.1016/j.sab.2012.01.002

Cited by 63 publications

(44 citation statements)

References 68 publications

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“…ICA plots are used to plot elements that are difficult to determine in absolute abundance, such as hydrogen. Quantification of hydrogen is a complex problem in LIBS due to its dependence on matrix effects (i.e., variations in optical and mechanical properties) [Sobron et al, 2012;Schröder et al, 2015]. ICA diagrams display scores in axes that correspond to uncalibrated, relative variations in the abundances of the plotted elements.…”

Section: A1 Chemistrymentioning

confidence: 99%

Composition of conglomerates analyzed by the Curiosity rover: Implications for Gale Crater crust and sediment sources

et al. 2016

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The Curiosity rover has analyzed various detrital sedimentary rocks at Gale Crater, among which fluvial and lacustrine rocks are predominant. Conglomerates correspond both to the coarsest sediments analyzed and the least modified by chemical alteration, enabling us to link their chemistry to that of source rocks on the Gale Crater rims. In this study, we report the results of six conglomerate targets analyzed by Alpha-Particle X-ray Spectrometer and 40 analyzed by ChemCam. The bulk chemistry derived by both instruments suggests two distinct end-members for the conglomerate compositions. The first group (Darwin type) is typical of conglomerates analyzed before sol 540; it has a felsic alkali-rich composition, with a Na 2 O/K 2 O > 5. The second group (Kimberley type) is typical of conglomerates analyzed between sols 540 and 670 in the vicinity of the Kimberley waypoint; it has an alkali-rich potassic composition with Na 2 O/K 2 O < 2. The variety of chemistry and igneous textures (when identifiable) of individual clasts suggest that each conglomerate type is a mixture of multiple source rocks. Conglomerate compositions are in agreement with most of the felsic alkali-rich float rock compositions analyzed in the hummocky plains. The average composition of conglomerates can be taken as a proxy of the average igneous crust composition at Gale Crater. Differences between the composition of conglomerates and that of finer-grained detrital sediments analyzed by the rover suggest modifications by diagenetic processes (especially for Mg enrichments in fine-grained rocks), physical sorting, and mixing with finer-grained material of different composition.

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Section: A1 Chemistrymentioning

confidence: 99%

Composition of conglomerates analyzed by the Curiosity rover: Implications for Gale Crater crust and sediment sources

et al. 2016

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“…Finally, statistics over the values of the predictors for the series of samples or for a series of repeated measurements on the same sample may reveal outliers, namely samples related to LIBS data statistically very different from the others. Rejecting outliers at the early stage of the processing allows minimizing the influence of abnormal data and consequently optimizing the results of the model [107], since outliers have a negative effect on the quantitative ability of the models [74]. As an example, Ciseweski et al [48], who classified samples as spores or not spores, removed outliers during the first step of preprocessing.…”

Section: Influence Of the Predictorsmentioning

confidence: 99%

Good practices in LIBS analysis: Review and advices

Haddad

Canioni

Bousquet

2014

Spectrochimica Acta Part B: Atomic Spectroscopy

274

109

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International audienceThis paper presents a review on the analytical results obtained by laser-induced breakdown spectroscopy (LIBS). In the first part, results on identification and classification of samples are presented including the risk of misclas-sification, and in the second part, results on concentration measurement based on calibration are accompanied with significant figures of merit including the concept of accuracy. Both univariate and multivariate approaches are discussed with special emphasis on the methodology, the way of presenting the results and the assessment of the methods. Finally, good practices are proposed for both classification and concentration measurement

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“…The LIBS spectra of the five samples were preprocessed following the procedure described by [ Sobron et al . ]. The conditioning routines include subtraction of continuum background, normalization to the total emission integrated intensity area of each spectrum, and spectra averaging.…”

Section: Resultsmentioning

confidence: 99%

Geochemical profile of a layered outcrop in the Atacama analogue using laser‐induced breakdown spectroscopy: Implications for Curiosity investigations in Gale

Sobrón

Lefebvre

Léveillé

et al. 2013

Geophysical Research Letters

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[1] We performed laboratory laser-induced breakdown spectroscopy (LIBS) and laser Raman spectroscopy measurements on samples from a layered outcrop from the Atacama Desert, Chile. This outcrop is a terrestrial morphological and possibly mineralogical analogue for similar formations that will likely be investigated by the Curiosity rover at Gale Crater. Our results demonstrate that fast LIBS analysis can generate semiquantitative chemical profiles in subminute times using automated data processing tools. Therefore, the LIBS instrument can be an invaluable tactical tool on the Curiosity rover for remote, rapid geochemical survey of layered outcrops, thus serving daily operational needs. The derived chemical profiles, supported by the range of minerals identified by Raman spectroscopy, is consistent with the products of a continental evaporitic lake. In the framework of future surface exploration on Mars, a combined Raman/LIBS investigation may provide a rapid mineralogical/chemical evaluation of targets that can be useful for selecting samples to be eventually collected for sample return purposes or for selecting sample sites to be drilled in the search for astrobiology-relevant species. Citation: Sobron,

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Extraction of compositional and hydration information of sulfates from laser-induced plasma spectra recorded under Mars atmospheric conditions — Implications for ChemCam investigations on Curiosity rover

Cited by 63 publications

References 68 publications

Composition of conglomerates analyzed by the Curiosity rover: Implications for Gale Crater crust and sediment sources

Composition of conglomerates analyzed by the Curiosity rover: Implications for Gale Crater crust and sediment sources

Good practices in LIBS analysis: Review and advices

Geochemical profile of a layered outcrop in the Atacama analogue using laser‐induced breakdown spectroscopy: Implications for Curiosity investigations in Gale

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