Composition of Amazonian volcanic materials in Tharsis and Elysium, Mars, from MRO/CRISM reflectance spectra

Viviano, C. E.; Murchie, S. L.; Daubar, I. J.; Morgan, M. F.; Seelos, Frank P.; Plescia, J. B.

doi:10.1016/j.icarus.2019.03.001

Cited by 37 publications

(27 citation statements)

References 64 publications

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“…In addition, recent work (Ojha et al, 2018) has highlighted dust as a reservoir of S and Cl on the martian surface, and specific areas of the surface are suggested to have mantles of sufficient thickness to influence GRS observations (Viviano et al, 2019). These constraints make the Mars Odyssey GRS chemical data key to examining regional-and global-scale trends in soil chemistry.…”

Section: 1029/2019gl084483mentioning

confidence: 99%

“…However, this work focused solely on H 2 O and S; the influence of Cl and nonvolatile elements were not considered. In addition, recent work (Ojha et al, 2018) has highlighted dust as a reservoir of S and Cl on the martian surface, and specific areas of the surface are suggested to have mantles of sufficient thickness to influence GRS observations (Viviano et al, 2019). The inclusion of Cl, nonvolatile soil chemistry, and a metric for surface dust adds additional dimensions to build upon and advance these previous findings.…”

Section: 1029/2019gl084483mentioning

confidence: 99%

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Contrasting Regional Soil Alteration Across the Topographic Dichotomy of Mars

Hood

Karunatillake

Gasnault

et al. 2019

Geophysical Research Letters

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Landscapes on either side of the martian topographic dichotomy bear distinct soil chemistry, but the processes associated with this distinction remain poorly understood. Here, correlation of soil chemistry at global to regional scales is examined with multivariate analysis of Gamma-Ray Spectrometer chemical maps and the Thermal Emission Spectrometer-derived Dust Cover Index (DCI). In the analysis, the northern lowlands show a strong S-Cl correlation, contrasting with the southern highlands, which show a stronger S-H 2 O correlation. These observations suggest aqueous interaction with soils throughout the southern highlands, preferentially dissolving Cl compounds and weakening S-Cl correlation. Strong S-Cl correlations in the northern lowlands suggest less interaction with aqueous H 2 O. Additionally, regional analyses demonstrate that DCI does not correlate with volatile chemistry at smaller scales and that Ca may be an important component of volatile-bearing material. These results provide new evidence for widespread aqueous interaction and possibly alteration of soil in the southern highlands.Plain Language Summary Mars can be divided into two large regions: the northern lowlands and southern highlands, separated by a planet-circling change in elevation known as the topographic dichotomy. The soils that cover the landscape in these two areas appear distinct from one another, although it is unclear what processes cause this distinction. This investigation examines the chemistry of soils on either side of the dichotomy based on Gamma-Ray Spectrometer data, to elucidate changes in soils. The identified changes in correlation of three soil components, sulfur, chlorine, and H 2 O, suggest that much of the southern highlands soils have interacted with water, but fluid interaction occurred far less in the northern lowlands. These findings show that the processes by which water interacts with soils were likely active over larger areas in the southern highlands than previously realized, but such processes were not active after the northern lowlands soils were deposited.

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Section: 1029/2019gl084483mentioning

confidence: 99%

Section: 1029/2019gl084483mentioning

confidence: 99%

Contrasting Regional Soil Alteration Across the Topographic Dichotomy of Mars

Hood

Karunatillake

Gasnault

et al. 2019

Geophysical Research Letters

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“…The lower values for hydrated mineral summary products could be explained by more recent volcanism, of which the rocks might have remained unaltered. The low values for OLINDEX3 remains unclear, especially because the detailed studies of Viviano et al (2019) concluded that the composition of this region is similar to other Hesperian regions on Mars.…”

Section: Clusters Of Potential Geological Originmentioning

confidence: 93%

Defining Surface Types of Mars Using Global CRISM Summary Product Maps

et al. 2020

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For many regions on Mars, the surface composition and its geological history have been debated in the literature. Because of the limited surface coverage of in situ measurements, either new data or new processing methodologies are required to get a better understanding of the Martian geology. This paper presents the results of a multivariate, unsupervised, analysis on underutilized CRISM (Compact Reconnaissance Imaging Spectrometer) multispectral mapping mode data set for surface type analysis. The devised summary products of Pelkey et al. (2007) and Viviano‐Beck et al. (2014) are averaged for the CRISM ~5° × 5° mosaic grids and used to analyze the variability in this data set. The averaged summary product values are studied using correlation coefficients calculated between summary products, as well as the correlation with dust coverage and elevation. The degree of correlation is used to interpret the summary products for the global distribution of mafic and secondary minerals and the effect of external factors such as ice, atmosphere, and dust coverage. With unsupervised clustering, all grid pixels are classified based on the spectral variability. These clusters are plotted as global maps and interpreted for geological variations in the CRISM data. Some clusters spatially correspond with previously recognized compositional distinct regions Northern Lowlands, Southern Highlands, Meridiani Planum, Syrtis Major, and Nili Fossae. Several other clusters are described here for the first time such as Solis Planum, Ophir Planum, and Hellas Basin. These regions cover known geological units, but the interpretation of the spectral variability is uncertain whether it relates to geological or external factors.

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“…Band parameters (center, asymmetry, and area) were calculated using the methods of Horgan et al (2014). Mineral interpretations were based on comparison to parameters for laboratory spectra analyzed by Cloutis & Gaffey (1991), Klima et al, (2007), Klima et al, (2011), Horgan et al (2014), and Viviano et al (2019).…”

Section: Band Parameter Analysismentioning

confidence: 99%