Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U–Pb carbonate geochronology [Elektronisk resurs] strategies, progress, and limitations
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Roberts, Nick (författare)
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Drost, Kerstin (författare)
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Horstwood, Matthew (författare)
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Condon, Daniel (författare)
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Chew, David (författare)
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Drake, Henrik, 1979- (författare)
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Milodowski, Antoni (författare)
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McLean, Noah (författare)
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Smye, Andrew (författare)
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Walker, Richard (författare)
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Haslam, Richard (författare)
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Hodson, Keith (författare)
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Jonathan, Imber (författare)
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Nicolas, Beaudoin (författare)
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Jack, Lee (författare)
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Linnéuniversitetet Fakulteten för Hälso- och livsvetenskap (FHL) (utgivare)
- Publicerad: Copernicus Publications, 2020
- Engelska.
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Ingår i: Geochronology. ; 2, 33-61
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- Relaterad länk:
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http://lnu.se/ (Värdpublikation)
Sammanfattning
Ämnesord
Stäng
- Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U–Pb geochronology of carbonate minerals, calcite in particular, is rapidly gaining popularity as an absolute dating method. The high spatial resolution of LA-ICP-MS U–Pb carbonate geochronology has benefits over traditional isotope dilution methods, particularly for diagenetic and hydrothermal calcite, because uranium and lead are heterogeneously distributed on the sub-millimetre scale. At the same time, this can provide limitations to the method, as locating zones of radiogenic lead can be time-consuming and “hit or miss”. Here, we present strategies for dating carbonates with in situ techniques, through imaging and petrographic techniques to data interpretation; our examples are drawn from the dating of fracture-filling calcite, but our discussion is relevant to all carbonate applications. We review several limitations to the method, including open-system behaviour, variable initial-lead compositions, and U–daughter disequilibrium. We also discuss two approaches to data collection: traditional spot analyses guided by petrographic and elemental imaging and image-based dating that utilises LA-ICP-MS elemental and isotopic map data.
Ämnesord
- Natural Sciences (hsv)
- Earth and Related Environmental Sciences (hsv)
- Geology (hsv)
- Naturvetenskap (hsv)
- Geovetenskap och miljövetenskap (hsv)
- Geologi (hsv)
- Natural Science (lnu)
- Naturvetenskap (lnu)
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- government publication (marcgt)
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Geochronology