Quantifying weathering rind formation rates using in situ measurements of U-series isotopes with laser ablation and inductively coupled plasma-mass spectrometry

Ma, Lin; Dosseto, Anthony; Gaillardet, Jérôme; Sak, Peter B.; Brantley, Susan L.

doi:10.1016/j.gca.2018.12.020

Cited by 8 publications

(3 citation statements)

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“… 41 ) and half-lives of 75,690 years ( 230 Th) and 245,250 years ( 234 U) 46 . Analyses were also undertaken by laser ablation MC-ICP-MS at the Wollongong Isotope Geochronology Laboratory, University of Wollongong 47 . Laser ablation was performed with a New Wave Research ArF 193 nm Excimer laser, equipped with a TV2 cell.…”

Section: Methodsmentioning

confidence: 99%

The demise of the giant ape Gigantopithecus blacki

Zhang,

Westaway,

Haberle

et al. 2024

Nature

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The largest ever primate and one of the largest of the southeast Asian megafauna, Gigantopithecus blacki1, persisted in China from about 2.0 million years until the late middle Pleistocene when it became extinct2–4. Its demise is enigmatic considering that it was one of the few Asian great apes to go extinct in the last 2.6 million years, whereas others, including orangutan, survived until the present5. The cause of the disappearance of G. blacki remains unresolved but could shed light on primate resilience and the fate of megafauna in this region6. Here we applied three multidisciplinary analyses—timing, past environments and behaviour—to 22 caves in southern China. We used 157 radiometric ages from six dating techniques to establish a timeline for the demise of G. blacki. We show that from 2.3 million years ago the environment was a mosaic of forests and grasses, providing ideal conditions for thriving G. blacki populations. However, just before and during the extinction window between 295,000 and 215,000 years ago there was enhanced environmental variability from increased seasonality, which caused changes in plant communities and an increase in open forest environments. Although its close relative Pongo weidenreichi managed to adapt its dietary preferences and behaviour to this variability, G. blacki showed signs of chronic stress and dwindling populations. Ultimately its struggle to adapt led to the extinction of the greatest primate to ever inhabit the Earth.

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Section: Methodsmentioning

confidence: 99%

The demise of the giant ape Gigantopithecus blacki

Zhang,

Westaway,

Haberle

et al. 2024

Nature

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“…In situ analysis by laser ablation coupled with multicollector ICP−MS (LA-MC-ICP−MS) has been applied to obtain the U−Th concentration and isotopic composition as an efficient technique in studying carbonate geochronology 20−23 and silicate weathering processes. 24 These studies have all used lithified geological samples focused on 230 Th, 232 Th, 234 U, and 238 U. However, to obtain the bulk concentration of U−Th−Pa radionuclides from the unconsolidated marine sedimentary particles, it is necessary to homogenize the samples and minimize the matrix effect for laser ablation.…”

mentioning

confidence: 99%

“…In situ analysis by laser ablation coupled with multicollector ICP–MS (LA-MC-ICP–MS) has been applied to obtain the U–Th concentration and isotopic composition as an efficient technique in studying carbonate geochronology − and silicate weathering processes . These studies have all used lithified geological samples focused on 230 Th, 232 Th, 234 U, and 238 U.…”

mentioning

confidence: 99%

Determination of Picogram-per-Gram Concentrations of ²³¹Pa and ²³⁰Th in Sediments by Melt Quenching and Laser Ablation Mass Spectrometry

Zheng

Chen

et al. 2022

Anal. Chem.

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Uranium, thorium, and protactinium radionuclides in marine sediments are important proxies for understanding the earth’s environmental evolution. Conventional solution-based methods, which typically involve isotope spike preparation, concentrated acid sample digestion, column chemistry, and mass spectrometry, allow precise but time-consuming and costly measurements of these nuclide concentrations (i.e., 230Th and 231Pa). In this work, we have established an efficient method for 230Th and 231Pa measurement of marine sediments down to the picogram-per-gram level without purification and enrichment. Our method first transforms a small amount of thermally decomposed sediments (∼0.1–0.2 g) to homogeneous silicate glass using a melt quenching technique and then analyzes the glass with laser ablation multicollector inductively coupled plasma–mass spectrometry. Standard sample bracketing with isotope-spike-calibrated glass standards prepared in this study was used to correct for instrumental fractionation during measurement. It is demonstrated that our method can accurately determine the U–Th–Pa concentrations of typical marine sediments in the late Pleistocene with precision of a few percent. Compared with the conventional solution-based methods, the turnover time of sample preparation and measurement with our established protocol is greatly reduced, facilitating future application of U-series radionuclides in reconstructing oceanic processes at high temporal and spatial resolution.

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Weathering Rinds as Tools for Constraining Reaction Kinetics and Duration of Weathering at the Clast‐Scale

Sak

2021

Hydrogeology, Chemical Weathering, and Soil Formation

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Quantifying weathering rind formation rates using in situ measurements of U-series isotopes with laser ablation and inductively coupled plasma-mass spectrometry

Cited by 8 publications

References 73 publications

The demise of the giant ape Gigantopithecus blacki

The demise of the giant ape Gigantopithecus blacki

Determination of Picogram-per-Gram Concentrations of ²³¹Pa and ²³⁰Th in Sediments by Melt Quenching and Laser Ablation Mass Spectrometry

Weathering Rinds as Tools for Constraining Reaction Kinetics and Duration of Weathering at the Clast‐Scale

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Quantifying weathering rind formation rates using in situ measurements of U-series isotopes with laser ablation and inductively coupled plasma-mass spectrometry

Cited by 8 publications

References 73 publications

The demise of the giant ape Gigantopithecus blacki

The demise of the giant ape Gigantopithecus blacki

Determination of Picogram-per-Gram Concentrations of 231Pa and 230Th in Sediments by Melt Quenching and Laser Ablation Mass Spectrometry

Weathering Rinds as Tools for Constraining Reaction Kinetics and Duration of Weathering at the Clast‐Scale

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Determination of Picogram-per-Gram Concentrations of ²³¹Pa and ²³⁰Th in Sediments by Melt Quenching and Laser Ablation Mass Spectrometry