The Impact of Measurement Scale on the Univariate Statistics of K, Th, and U in the Earth Crust

Baratoux, D.; Fall, Mor; Meslin, Pierre‐Yves; Jessell, Mark; Vanderhaeghe, O.; Moyen, Jean‐François; Ndiaye, P.; Boamah, Kwame; Baratoux, Lenka; André-Mayer, Anne-Sylvie

doi:10.1029/2021ea001786

Cited by 2 publications

(2 citation statements)

References 43 publications

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“…The concentrations in K and Th are from the Gamma-Ray Spectrometer (GRS) aboard the Mars Global Surveyor (MGS) 28 , 29 . Although the spatial resolution of the data is low (5°x5°, corresponding to ~296 km at the equator), this dataset offers a consistent method to compare the concentration of both elements qualitatively between several regions where the crater candidates are located 63 . We report here both the pixel value of the concentration of K and Th at the crater location (Supplementary Table 1 ) and the bilinear interpolation computed with a radius of 296 km around each crater centroid (Supplementary Table 2 ).…”

Section: Methodsmentioning

confidence: 99%

Early crustal processes revealed by the ejection site of the oldest martian meteorite

et al. 2022

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The formation and differentiation of the crust of Mars in the first tens of millions of years after its accretion can only be deciphered from incredibly limited records. The martian breccia NWA 7034 and its paired stones is one of them. This meteorite contains the oldest martian igneous material ever dated: ~4.5 Ga old. However, its source and geological context have so far remained unknown. Here, we show that the meteorite was ejected 5–10 Ma ago from the north-east of the Terra Cimmeria—Sirenum province, in the southern hemisphere of Mars. More specifically, the breccia belongs to the ejecta deposits of the Khujirt crater formed 1.5 Ga ago, and it was ejected as a result of the formation of the Karratha crater 5–10 Ma ago. Our findings demonstrate that the Terra Cimmeria—Sirenum province is a relic of the differentiated primordial martian crust, formed shortly after the accretion of the planet, and that it constitutes a unique record of early crustal processes. This province is an ideal landing site for future missions aiming to unravel the first tens of millions of years of the history of Mars and, by extension, of all terrestrial planets, including the Earth.

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Section: Methodsmentioning

confidence: 99%

Early crustal processes revealed by the ejection site of the oldest martian meteorite

et al. 2022

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“…For instance, changes in the statistical properties of K between the northern and southern part of the granite of Saraya have been identified and interpreted as a consequence of surface processes [26]. The frequency distributions are also scale-dependent and evolve from complex distributions (including multi-modal) to normal distributions with increasing sample size a consequence of the central limit theorem [28]. If concentrations cannot be uniquely interpreted in terms of lithology, the studies mentioned above suggest that statistical analyses may provide additional criteria to discriminate and map crustal rocks or alteration processes.…”

Section: Introductionmentioning

confidence: 99%

Multi-Parameter Statistical Analysis of K, Th, and U Concentrations in Eastern Senegal: Implications for the Interpretation of Airborne Radiometrics

Thiam,

Baratoux,

Fall

et al. 2023

Geosciences

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In geological mapping, maps of K, Th, and U concentrations provided by airborne radiometric surveys are widely used to delineate geological units in tropical regions from the few rare outcrops. Indeed, thanks to their specific geochemical properties and behaviors, K, Th, and U allow us to trace geological processes. However, the combination of the concentrations of these radioelements does not allow us to determine the lithology in a unique way. We examined the potential of delineating the statistical parameters of K, Th, and U concentrations for geological mapping using the purpose airborne radiometric data in eastern Senegal. The mean, standard deviation, skewness, and kurtosis were calculated and mapped at a baseline of 3000 m. We noted the narrow dispersion of skewness and kurtosis values away from the expected curve for the log-normal distribution, implying that log-normal distributions dominate at the scale of analysis. The higher moments (kurtosis and skewness) varied more over shorter distances than lower order moments (mean and standard deviation). Mixtures of log-normal distributions across some lithological contacts with large differences in statistical parameters may account for this behavior. The area covered by the airborne radiometric data was classified into eight units according to the statistical parameters. The eight clusters do not show obvious correlations with geological units, but they may be interpreted in terms of the superposition of lithology and recent superficial processes (erosion and weathering).

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The Impact of Measurement Scale on the Univariate Statistics of K, Th, and U in the Earth Crust

Cited by 2 publications

References 43 publications

Early crustal processes revealed by the ejection site of the oldest martian meteorite

Early crustal processes revealed by the ejection site of the oldest martian meteorite

Multi-Parameter Statistical Analysis of K, Th, and U Concentrations in Eastern Senegal: Implications for the Interpretation of Airborne Radiometrics

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