Behavior of U, Th and Ra isotopes in soils during a land cover change

Rihs, Sophie; Gontier, Adrien; Pelt, Éric; Fries, David M.; Turpault, Marie–Pierre; Chabaux, François

doi:10.1016/j.chemgeo.2016.08.016

Cited by 7 publications

(3 citation statements)

References 79 publications

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“…The modeling results support also the conclusions of previous works (Ackerer et al, 2016;Gontier et al, 2015;Rihs et al, 2016) that the upper part of the weathering profiles marked by the vegetation/biological influences is not well adapted for applying the U-series nuclides methodology for recovering regolith production rates. More importantly, they also indicate that below the vegetation influence zone, the zones suitable for application of the modeling approach do not exceed 1 or 2 meters in thickness, and that all parts of the profile are not necessarily appropriate for such modeling.…”

Section: Application Of the Modeling Approachsupporting

confidence: 86%

Determination of regolith production rates from 238U-234U-230Th disequilibrium in deep weathering profiles (Longnan, SE China)

et al. 2021

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Section: Application Of the Modeling Approachsupporting

confidence: 86%

Determination of regolith production rates from 238U-234U-230Th disequilibrium in deep weathering profiles (Longnan, SE China)

et al. 2021

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“…Among the natural radioactive elements, the relatively immobile Th seems to be the best lithological indicator (e.g., Breiter et al 1998 in the Moldanubian Pluton;Leichmann et al 2016 in the Třebíč durbachite Pluton). The use of U in petrological studies is limited because of its solubility and mobility (e.g., Attia and Wahid 2016;Rihs et al 2016;Weihermann et al 2016;Kanzari et al 2017). The distribution of potassium can contribute to lithological studies but it might also indicate rock alterations accompanying ore-bearing processes (Gnojek and Přichystal 1985).…”

Section: Discussionmentioning

confidence: 99%

“…The airborne data were locally supported by in-situ measurements on bedrock outcrops. The concentrations of natural radioactive elements were acquired using a portable gamma-ray spectrometer GRM-256 (GF Instru-Concentrations of mobile U tend to be modified by post-magmatic processes (e.g., Attia and Wahid 2016;Rihs et al 2016;Weihermann et al 2016;Kanzari et al 2017), and do not reflect the petrology so directly as K and Th. For that reason, we discuss concentrations of K ( Fig.…”

Section: Ground Gamma-ray Spectrometrymentioning

confidence: 99%

Structure of the Carboniferous Altenberg-Teplice Caldera (Eastern part of the Krušné hory/Erzgebirge Mts.) revealed by combined airborne and ground gamma-ray spectrometry

Gnojek¹,

Sedlák²,

Rapprich³

et al. 2018

J. Geosci.

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The airborne gamma-ray spectrometry images from the Czech and German parts of the Carboniferous Altenberg-Teplice Volcanic Complex (ATVC)-both obtained during independent surveying campaigns-were merged to display the structure of the caldera fill (dominated by rhyolitic ignimbrites) and associated intrusive bodies. The airborne systematic measurements were supported by the ground-and laboratory gamma-ray spectrometry analyses (K, U, Th) of representative lithologies from outcrops and drill-cores. Significant differences were identified between the younger and older (post-and pre-caldera respectively) intrusive complexes related to the ATVC. The younger Schellerhau granite displays 1.5-3.0× higher concentrations of radioactive elements than the older Fláje granite. The ATVC was found to be split by the NW-SE trending Altenberg Fault into a southern and a northern segment that expose different stratigraphic levels of the caldera's fill. The individual types of rhyolite ignimbrites defined in the Czech part of the ATVC are characterized by distinct concentrations of natural radioactive elements which enable identification of the individual types from the airborne gamma-spectrometry image. These characteristics were compared to data obtained from the German part, and several lithological types were unified to common units. A single Th-rich unit (Pramenáč type in Czech part, Lugstein type in Germany and Teplice Rhyolite TR3a in Mi-4 borehole) can be traced across the entire caldera and may serve as the principal correlation member. Inclusion of the Vrchoslav type into this TR3a unit remains speculative due to lack of data, and further petrological research is required. On the other hand, Vlčí kámen and Medvědí vrch types from opposite sides of the caldera display identical properties allowing to merge them into a common unit TR3b overlain by the youngest unit TR4 (Přední Cínovec type)-restricted to the Czech territory. This result may suggest partly synclinal structure within the southern ATVC segment. The TR4 unit has a strong compositional tendency towards the post-ignimbrite granite porphyry intrusions. Some lithotypes in the northern segment (e.g., Buschmühle) do not have counterparts on the Czech side and most likely represent an independent volcanic unit in the northern, presumably older, part of the caldera. The uniform composition of the rhyolitic rocks observed in the entire profiles of the drillings located in the Town Teplice (TP-39 reaching 1170 m depth) may suggest that the main feeding conduit system for the TR4 ignimbrite was located within the Teplice-Lahošť horst area.

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Behavioral differences between weathering and pedogenesis in a subtropical humid granitic terrain: Implications for chemical weathering intensity evaluation

Mei

Jian

Zhang

et al. 2021

CATENA

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Behavior of U, Th and Ra isotopes in soils during a land cover change

Cited by 7 publications

References 79 publications

Determination of regolith production rates from 238U-234U-230Th disequilibrium in deep weathering profiles (Longnan, SE China)

Determination of regolith production rates from 238U-234U-230Th disequilibrium in deep weathering profiles (Longnan, SE China)

Structure of the Carboniferous Altenberg-Teplice Caldera (Eastern part of the Krušné hory/Erzgebirge Mts.) revealed by combined airborne and ground gamma-ray spectrometry

Behavioral differences between weathering and pedogenesis in a subtropical humid granitic terrain: Implications for chemical weathering intensity evaluation

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