The uranium isotope paleoredox proxy
Kimberly V. Lau, Stephen J. Romaniello, Feifei Zhang.
Bok Engelsk 2019 · Electronic books.
| Annen tittel | |
|---|---|
| Medvirkende | Romaniello, Stephen J., (author.)
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| Omfang | 1 online resource (27 pages) : : digital, PDF file(s).
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| Utgave | 1st ed.
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| Opplysninger | Title from publisher's bibliographic system (viewed on 13 Aug 2019).. - Cover -- Title page -- Copyright page -- The Uranium Isotope Paleoredox Proxy -- Contents -- 1 Introduction -- 2 Systematics of the Uranium Isotope Paleoredox Proxy -- 3 Materials and Methods -- 3.1 Carbonate Rocks -- 3.2 Organic-Rich Shales -- 3.3 Other Sedimentary Archives -- 3.4 Analytical Methods -- 4 Case Studies -- 4.1 Compilations across Geologic Time -- 4.2 The End-Permian Mass Extinction -- 4.3 Comparing δ[sup(238)]U in Carbonate Rocks and Organic-Rich Shales -- 5 Outlook -- 6 Key Papers -- References -- Acknowledgments.. - Uranium isotopes (238U/235U) have emerged as a proxy to reconstruct the redox conditions of the Earth's oceans and atmosphere based upon the large isotopic fractionation between reduced U(IV) and oxidized U(VI). Variations in 238U/235U, particularly when recorded in carbonate sediments, can track global trends in marine oxygenation and de-oxygenation. It is unique from other proxies because reduction primarily occurs at the sediment-water interface, and this sensitivity makes U isotopes especially relevant for the habitability of benthic animals. This Element covers the background, methods, and case studies of this promising tool for understanding Earth's environmental transitions, as rapid development continues to refine the accuracy of interpretations of 238U/235U records.
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| Emner | |
| Sjanger | |
| Dewey | |
| ISBN | 1108584144. - 9781108584142
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