German Title: Uranreihen-Datierung diagenetisch veränderter fossiler Riffkorallen und die Anwendung zur Meeresspiegelrekonstruktion. Mithilfe von fossilen Riffkorallen ist eine exakte Rekonstruktion der Meeresspiegelschwankungen der Vergangenheit möglich. Dieses Phänomen ist unter dem Begriff diagenetische Veränderungen bekannt. In der vorliegenden Arbeit werden fossile Riffkorallen aus Aqaba, Jordanien, und Barbados, Westindische Inseln, untersucht. Die Porites Korallen aus Aqaba zeigen einen hohen Grad diagenetischer Veränderungen und sind daher ideal geeignet, um die diagenetischen Prozesse zu untersuchen. Mithilfe eines numerischen Modells wird gezeigt, dass die Isochron dating dieser Korallen durch nachträgliche Uranaufnahme gefolgt von teilweisem Verlust des aufgenommenen Urans erklärt werden können. Auf dieser Basis wird ein Korrekturverfahren das Isochronenverfahren entwickelt, das isochron dating ermöglicht, glaubwürdige Uranreihen-Alter für Korallen zu berechnen, die nicht mit den herkömmlichen Methoden datiert werden können. Die Acropora palmata und Diploria strigosa Korallen aus Barbados zeigen einen geringeren Grad diagenetischer Veränderungen. Es wird gezeigt, dass diese Korallen durch einen anderen Prozess beeinflusst wurden als die Korallen aus Aqaba. Daher können sie nicht mit der Isochronenmethode datiert werden. Dennoch ist es möglich, Höhe, Beginn und Dauer des Meeresspiegel Hochstands während des Marinen Isotopen Stadiums MIS 6. MIS 6. Die vorliegende Meeresspiegelkurve ist die erste, exakt isochron dating, direkte Meeresspiegelrekonstruktion für das Marine Isotopen Stadium 6. This phenomenon is denoted by the term diagenetic alterations. In this isochron dating fossil reef corals from Aqaba, Jordan, and Barbados, West Indies, are investigated by U-series methods. The corals of the genus Porites from Aqaba show a very high degree of diagenetic alteration. Therefore, they are ideally suited to study the diagenetic processes. It is demonstrated by numerical modelling that the activity ratios of these corals can be explained by post depositional U uptake followed by partial loss of the additional U. On the basis of these results a correction technique the isochron dating method is developed which enables to calculate reliable U-series ages for corals which could not be dated by the conventional methods. The corals of the genus Acropora palmata and Diploria strigosa from Barbados show less degree of diagenetic alteration. It is shown that these corals have been affected by a different process than the Aqaba corals. Therefore, they cannot be dated by the isochron dating method. Nevertheless, the results allow an accurate reconstruction of the magnitude, timing, and duration of the sea level peak during Marine Isotope Substage MIS 6. The presented record is the first precisely dated direct measurement of sea level during this period. Login to heiDOK. U-series dating of diagenetically altered fossil reef corals and the application for sea level reconstruction. Scholz, Denis. Access statistics. Citation of documents: Please do not cite the URL that is displayed in your browser location input, instead use the DOIURN or the persistent URL below, as we can guarantee their long-time accessibility. DOI: About FAQ Contact Imprint. PDF, English Download 2MB Terms of use. Isotopendatierung, Steinkorallen, Fossile Korallen, Diagenese, Meeresspiegel, Meeresspiegelschwankung, Radioaktiver Zerfall, Zerfallsreihe.
Released Journal Article Rock uplift rates in South Africa from isochron burial dating of fluvial and marine terraces. Daher können sie nicht mit der Isochronenmethode datiert werden. START BASKET 0 Tools. Lehrstuhl für Geologie und Lagerstättenlehre Bickel, L. U-series dating of diagenetically altered fossil reef corals and the application for sea level reconstruction.
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isochron burial dating in combination with luminescence dating of two Danube terraces. In situ Rb-Sr dating of the same assemblage (K-feldspar and muscovite) in the host rock gave an isochron age of ± Ma, 10 Ma older than. Geophysical Research Abstracts Vol. 18, EGU, EGU. We have combined precise in situ Pb-Pb dates with Pb-Pb isochron dating to constrain the early history of the Apollo 17 granulite The rock contains. All orthogneisses belong to the suite of calcalkaline to. Six orthogneisses near Mellid have an isochron age of ± 24 Ma with initial.Bickel, L; Lüthgens, C; Lomax, J; Fiebig, M. Dieses Phänomen ist unter dem Begriff diagenetische Veränderungen bekannt. The age of vein formation was successfully distinguished from the age of the Alpine-Himalayan orogenic event associated with main Menderes metamorphism. Fulltext public. Geophysical Research Abstracts, 14, ; ISSN We find that the Sundays River has incised at The corresponding eNd t value of These ages are interpreted to reflect the time of magmatic crystallization of the garnet. This reflects strong REE fractionation in the pegmatite garnet, which, together with the inclusion-free nature of the crystal, points to the high suitability of such garnets for Sm-Nd dating. This phenomenon is denoted by the term diagenetic alterations. Zitationsweisen APA Author BIBTEX Harvard Standard RIS Vancouver Sölva, H. Textural relationships between the vein minerals suggest that arsenopyrite, K-feldspar, quartz, and muscovite formed in one paragenetic stage. These results are inconsistent with rapid Neogene uplift. About FAQ Contact Imprint. Gibbon, Ryan J. AB - The Sm-Nd isotope systematics of a single large garnet crystal have been analyzed, applying both standard and leaching separation techniques. DOI: Alpenvorlandes; Vortrag auf der Jahrestagung der Arbeitsgemeinschaft Alpenvorland Quartär AGAQ in Seeham, Österreich April Fiebig, M. Login to heiDOK. AGAQ , MAY , , Kolsassberg, AUSTRIA. Coarse-grained white mica and K-feldspar from the same sample yield a Rb-Sr date of High Ir abundances and the presence of metal indicate that the gabbro crystallized from impact melt. Geological, textural, and chemical arguments, plus impact melt distribution models, suggest that the widespread 3. Lunar granulites — impactites that were thermally metamorphosed by impact melt sheets — also should record basin-forming events. U2 - Bickel, L; Lüthgens, C; Lomax, J; Fiebig, M : Unraveling the glacial history of an eastern alpine valley by luminescence dating Ybbs, Austria. Mini-conference and workshop an reginal and method to method comparison of numerical dating results , OCT 30, , Szeged Lüthgens, C; Bickel, L; Lomax, J; Fiebig, M. Abstract The Sm-Nd isotope systematics of a single large garnet crystal have been analyzed, applying both standard and leaching separation techniques. The core and the rim fraction of the magmatic garnet give Sm-Nd ages of Dennoch ist es möglich, Höhe, Beginn und Dauer des Meeresspiegel Hochstands während des Marinen Isotopen Stadiums MIS 6.
