Sample quality index to preselect suitable carbonate samples for alpha spectrometry U/Th dating

Prado-Pérez, Antonio J.; Vázquez, M.T. Crespo; Vargas, M. Jurado; Sánchez, A. Martı́n; Villar, Luis

doi:10.1016/j.apradiso.2012.11.015

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…Additional sedimentological analysis is applied here to identify textures indicative of (a) postdepositional alteration and (b) possible open system behavior (i.e., uranium loss), both of which may impart age biases. Primary textures and low porosity are important considerations when selecting samples for U‐Th dating because porous sediments with high hydraulic conductivity may allow leaching of soluble uranium from crystal boundaries, resulting in artificially older ages (Prado‐Pérez et al., 2013). In the following paragraphs, we describe features (macroscopic and in thin section) that were used to determine which samples to include in the final age‐depth model.…”

Section: Discussionmentioning

confidence: 99%

A >200 ka U‐Th Based Chronology From Lacustrine Evaporites, Searles Lake, CA

Stroup

Olson

Lowenstein

et al. 2023

Geochem Geophys Geosyst

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Section: Discussionmentioning

confidence: 99%

A >200 ka U‐Th Based Chronology From Lacustrine Evaporites, Searles Lake, CA

Stroup

Olson

Lowenstein

et al. 2023

Geochem Geophys Geosyst

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“…Application of this method in some cases is controversial because of the complexity related to open-system U-leaching and the presence of detrital thorium (Alonso-Zarza et al, 2010). Recent studies (Mallick and Frank, 2002;Prado-Pérez et al, 2013;Özkul et al, 2013), however, claim to be able to circumvent these problems.…”

Section: Methodsmentioning

confidence: 99%

The Anatomy of a Pleistocene Travertine Complex Sedimentological, Diagenetic and Reservoir Studies on the Süttő Travertine System (Gerecse Hills, Hungary)

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2018

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“…Additional sedimentological analysis is applied here to identify textures indicative of 1) post-depositional alteration and 2) possible open system behavior (i.e., uranium loss), both of which may impart age biases. Primary textures and low porosity are important considerations when selecting samples for U-Th dating because porous sediments with high hydraulic conductivity may allow leaching of soluble uranium from crystal boundaries, resulting in artificially older ages (Prado-Pérez et al, 2013). In the paragraphs that follow, we describe features (macroscopic and in thin section) that were used to determine which samples to include in the final age-depth model.…”

Section: Sedimentological Criteria For Age Selectionmentioning

confidence: 99%

A > 200 ka U-Th based chronology from lacustrine evaporites, Searles Lake, CA

Stroup

Olson

Lowenstein

et al. 2022

Preprint

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Well-dated lacustrine records are essential to establish the timing and drivers of regional hydroclimate change. Searles Basin, California records the depositional history of a fluctuating saline-alkaline lake in the terminal basin of the Owens River system draining the eastern Sierra Nevada. Here we establish a U-Th chronology for the ˜76-m-long SLAPP-SLRS17 core collected in 2017 based on dating of evaporite minerals. 98 dated samples comprising 9 different minerals were evaluated based on stratigraphic, mineralogic, textural, chemical and reproducibility criteria. After application of these criteria, a total of 37 dated samples remained as constraints for the age model. A lack of dateable minerals between 145-110 ka left the age model unconstrained over the penultimate glacial termination (Termination II). We thus established a tie point between plant wax δD values in the core and a nearby speleothem δ18O record at the beginning of the Last Interglacial. We construct a Bayesian age model allowing stratigraphy to inform sedimentation rate inflections. We find the >210 ka SLAPP-SRLS17 record contains five major units that correspond with prior work. The new dating is broadly consistent with previous efforts but provides more precise age estimates and a detailed evaluation of evaporite depositional history. We also offer a substantial revision of the age of the Bottom Mud-Mixed Layer contact, shifting it from ˜130 ka to 178±3 ka. The new U-Th chronology documents the timing of mud and salt layers and lays the foundation for climate reconstructions.

show abstract

Sample quality index to preselect suitable carbonate samples for alpha spectrometry U/Th dating

Cited by 6 publications

References 28 publications

A >200 ka U‐Th Based Chronology From Lacustrine Evaporites, Searles Lake, CA

A >200 ka U‐Th Based Chronology From Lacustrine Evaporites, Searles Lake, CA

The Anatomy of a Pleistocene Travertine Complex Sedimentological, Diagenetic and Reservoir Studies on the Süttő Travertine System (Gerecse Hills, Hungary)

A > 200 ka U-Th based chronology from lacustrine evaporites, Searles Lake, CA

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