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 Isochron dating 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 isochron dating sind daher ideal geeignet, um die diagenetischen Prozesse zu untersuchen. Mithilfe eines numerischen Modells wird gezeigt, dass die Aktivitätsverhältnisse 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 es 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, Isochron dating, Beginn und Dauer des Meeresspiegel Hochstands während des Marinen Isotopen Stadiums MIS 6. MIS 6. Die vorliegende Meeresspiegelkurve ist die erste, exakt datierte, direkte Meeresspiegelrekonstruktion für das Marine Isotopen Stadium 6. This phenomenon is denoted by the term diagenetic alterations. In this work 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. Isochron dating, 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.
An unleached garnet separate and three leachates deviate slightly, but systematically from the K-feldspar-garnet Sm-Nd isochron, due to the presence of secondary metamorphic minerals fine-grained white mica and chlorite. The corals of the genus Acropora palmata and Diploria strigosa from Barbados show less degree of diagenetic alteration. High Ir abundances and the presence of metal indicate that the gabbro crystallized from impact melt. The crustal-derived pegmatites were subsequently affected by Alpine metamorphism and polyphase deformation. U2 -
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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. All orthogneisses belong to the suite of calcalkaline to. 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. isochron burial dating in combination with luminescence dating of two Danube terraces. Geophysical Research Abstracts Vol. 18, EGU, EGU. Six orthogneisses near Mellid have an isochron age of ± 24 Ma with initial.Poreba Ed. Neuhuber, S. Lehrstuhl für Geologie und Lagerstättenlehre INQUA-SEQS The Quaternary of the Urals: Global trends and Pan-European Quaternary records, DEC 13, , Wien. Die Acropora palmata und Diploria strigosa Korallen aus Barbados zeigen einen geringeren Grad diagenetischer Veränderungen. Helmuth Sölva, Martin Thöni, Gerlinde Habler. The crustal-derived pegmatites were subsequently affected by Alpine metamorphism and polyphase deformation. Hauptversammlung der Deutschen Quartärvereinigung , Innsbruck, We have combined precise in situ Pb-Pb dates with Pb-Pb isochron dating to constrain the early history of the Apollo 17 granulite These ages are interpreted to reflect the time of magmatic crystallization of the garnet. PDF, English Download 2MB Terms of use. It is shown that these corals have been affected by a different process than the Aqaba corals. This study demonstrates that in situ Rb-Sr isotopic study can be applied to resolve absolute dating of orogenic deposits in metamorphic complexes. DOI: AB - The Sm-Nd isotope systematics of a single large garnet crystal have been analyzed, applying both standard and leaching separation techniques. The presented record is the first precisely dated direct measurement of sea level during this period. AGAQ , MAY , , Kolsassberg, AUSTRIA Bickel, L. European Journal of Mineralogy: an international journal of mineralogy, geochemistry and related sciences , 15 1 , Nevertheless, the results allow an accurate reconstruction of the magnitude, timing, and duration of the sea level peak during Marine Isotope Substage MIS 6. Andrews, Scotland, United Kingdom, AUG , ] Bickel, L. The phosphate Pb-Pb ages range between 4. Mittelpleistozäne Vergletscherungen im nördlichen Alpenvorland - Licht ins Dunkel durch Lumineszenzalter PN19 FWF Wissenschaftsfonds, A Wien Project Leader: Prof. German Title: Uranreihen-Datierung diagenetisch veränderter fossiler Riffkorallen und die Anwendung zur Meeresspiegelrekonstruktion. MIS 6. Auf dieser Basis wird ein Korrekturverfahren das Isochronenverfahren entwickelt, das es ermöglicht, glaubwürdige Uranreihen-Alter für Korallen zu berechnen, die nicht mit den herkömmlichen Methoden datiert werden können. Coarse-grained white mica and K-feldspar from the same sample yield a Rb-Sr date of Close Search. Andrews, UK Luminescence and ESR meeting: Developments - Methodologies — Application Bickel, L; Lüthgens, C; Lomax, J; Fiebig, M : Unraveling the glacial history of an eastern alpine valley by luminescence dating Ybbs, Austria. Lüthgens, C; Bickel, L; Lomax, J; Fiebig, M. Geophysical Research Abstracts, 14, ; ISSN Bickel, L. Zitationsweisen APA Author BIBTEX Harvard Standard RIS Vancouver Sölva, H. The heating event may either relate to the impact that formed the Crisium basin or to another nearby basin-forming impact on the feldspathic highland terrane Nectaris or Smythii. The rock contains annealed anorthositic gabbro clasts with relict igneous textures and a finer, thermally annealed matrix. JO - European Journal of Mineralogy: an international journal of mineralogy, geochemistry and related sciences. Zugriff auf Dokument
