![In situ U-series dating by laser-ablation multi-collector ICPMS: new prospects for Quaternary geochronology [An article from: Quaternary Science Reviews]](https://www.ebooknetworking.net/books/B00/0RR/bigB000RR7FV8.jpg)
In situ U-series dating by laser-ablation multi-collector ICPMS: new prospects for Quaternary geochronology [An article from: Quaternary Science Reviews]
Book Details
PublisherElsevier
ISBN / ASINB000RR7FV8
ISBN-13978B000RR7FV1
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Description
This digital document is a journal article from Quaternary Science Reviews, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The capabilities and potential applications of in situ dating of Quaternary materials using laser ablation-MC-ICPMS are explored. ^2^3^4U/^2^3^8U and ^2^3^0Th/^2^3^4U can be measured with precision sufficient for dating at a spatial resolution of 100@mm or better in samples that contain as a little as 1ppm uranium. Moreover, U and Th concentrations and U-series isotope ratios can be continuously profiled to determine changes in age that occur with sample growth (e.g. in speleothems). These capabilities additionally permit the dating of bones, teeth and possibly molluscs, which are subject to post-mortem open-system behaviour of U-series isotopes, and can be employed to elucidate processes of U-series migration during weathering and diagenesis. A drawback of laser ablation-MC-ICPMS is that it cannot in general provide U-series age estimates with the high precision and accuracy of conventional TIMS or solution MC-ICPMS methods. However, sample preparation is straightforward, the amount of sample consumed negligible, and it can be used to rapidly characterise or screen and select samples from which more precise and accurate dates can be obtained using conventional methods. Given further instrumental developments and the establishment of suitable matrix-matched standards for carbonates and other materials, we foresee that laser ablation-MC-ICPMS will play an increasingly important role in Quaternary dating research.
Description:
The capabilities and potential applications of in situ dating of Quaternary materials using laser ablation-MC-ICPMS are explored. ^2^3^4U/^2^3^8U and ^2^3^0Th/^2^3^4U can be measured with precision sufficient for dating at a spatial resolution of 100@mm or better in samples that contain as a little as 1ppm uranium. Moreover, U and Th concentrations and U-series isotope ratios can be continuously profiled to determine changes in age that occur with sample growth (e.g. in speleothems). These capabilities additionally permit the dating of bones, teeth and possibly molluscs, which are subject to post-mortem open-system behaviour of U-series isotopes, and can be employed to elucidate processes of U-series migration during weathering and diagenesis. A drawback of laser ablation-MC-ICPMS is that it cannot in general provide U-series age estimates with the high precision and accuracy of conventional TIMS or solution MC-ICPMS methods. However, sample preparation is straightforward, the amount of sample consumed negligible, and it can be used to rapidly characterise or screen and select samples from which more precise and accurate dates can be obtained using conventional methods. Given further instrumental developments and the establishment of suitable matrix-matched standards for carbonates and other materials, we foresee that laser ablation-MC-ICPMS will play an increasingly important role in Quaternary dating research.
