The ice-rich permafrost deposits on the coastal lowland in northeastern Siberia and on the New Siberian Islands often contain layers, lenses, and inclusions of peat that are too old to be dated by AMS. Application of 230 Th/U disequilibrium dating
The AA. briefly review the TL dating of alluvium and the U/Thdating of pedogenic calcite, iron, and manganese deposits and they report on the application of both techniques to the weathered alluvium of the lower Gilbert River in northern Queensland.
Dating deposits in caves formed by rivers may yield insight into rates and processes of bedrock incision. Three cave passages at different levels have developed in the walls of the Qianyou River valley in the Qinling mountains, south of the city
of Xian. Twelve speleothems samples near the position of palaeowater tables in three cave passages are dated by the 230Th dating method. The results show that these events are close to the interglacial transitions following marine oxygen isotope stages 10
Reevaluation of the lake-sediment chronology in the Dead Sea Basin, Israel, based on new 230Th/Udates
Dating ; Dead Sea ; Geochronology ; Isotope analysis ; Israel ; Lacustrine sediment ; Lake level ; Palaeogeography ; Stratigraphy ; Th/Udating
Analyse isotopique ; Datation ; Datation Th/U ; Géochronologie ; Israël ; Mer Morte ; Niveau lacustre ; Paléogéographie ; Stratigraphie ; Sédiment lacustre
The Dead Sea is surrounded by chemical and detrital sediments that where deposited in its larger precursor lakes, Lake Samra and Lake Lisan. The sedimentary history of these lakes was reconstructed by means of 230Th/234 U ages of 30 samples
This paper reports U-series dates on speleothem samples from Localty 15 at Zhoukoudian, one of the richest Paleolithic sites in northern China. The AA discuss their implications for human physical and cultural evolution. The results are in line
In this paper, the AA. propose a revision of the radiocarbon chronology in the southern Bolivian Altiplano (Uyuni-Coipasa basin) based on a comparison between radiocarbon and Th/U disequilibrium methods performed on the same samples.
Upper Pleistocene comparative OSL, U/Th and C 14 datings of sedimentary sequences and correlative morphodynamical implications in the South-Western Anti-Atlas (Oued Noun, 29°N, Morocco)
Aeolian features ; Arid area ; C 14 dating ; Fluvial terrace ; Morocco ; Palaeogeography ; Pleistocene ; Sedimentology ; Th/Udating
Cet article présente les premiers âges U/Th obtenus sur 8 échantillons appartenant à 4 concrétions différentes de la Grotte des Demoiselles (Hérault, France). Ces datations ont permis de reconstituer l'histoire de la grotte, et de la comparer avec
Datation d'ossements et de planchers stalagmitiques provenant de l'abri des pêcheurs (Ardèche) par la méthode des déséquilibres des familles de l'uranium (U-Th)
Ardèche ; C 14 dating ; Dating ; Fauna ; France ; Geochronology ; Palaeo-environment ; Quaternary ; Rhône-Alpes ; Sedimentology ; Th/Udating
The AA. present ages obtained by both U-Th and C 14 dating methods and the results of analyses of the stable isotope compositions of carbon (δC 13) and oxygen (δO 18) of tufa deposits from the Krka River area. The results are compared with C 14
and U-Th ages of tufa deposits from the Plitvice Lakes area and with C 14 ages of speleothem samples collected in numerous caves in the Dinaric Karst. The systematic differences between the δO 18 values of tufa formed in the Krka River and Plitvice Lakes
A reassessment of U-Th and C 14 ages for Late-Glacial high-frequency hydrological events at Searles Lake, California
C 14 dating ; California ; Climatic variation ; Dating ; Evaporite ; Lacustrine sediment ; Lake level ; Lateglacial ; Pleistocene ; Pluvial ; Quaternary ; Th/Udating ; United States of America ; Water balance
Bilan hydrologique ; California ; Datation ; Datation C 14 ; Datation Th/U ; Etats-Unis ; Evaporite ; Niveau lacustre ; Pluvial ; Pléistocène ; Quaternaire ; Sédiment lacustre ; Tardiglaciaire ; Variation climatique
U-series chronology of lacustrine deposits in Death Valley, California
California ; Geochemistry ; Geochronology ; Lacustrine sediment ; Lake level ; Palaeoclimate ; Pluvial ; Quaternary ; Th/Udating ; United States of America ; Uranium
This paper reports the chronology as established by the uranium-series dating on a core drilled from Badwater Basin in Death Valley. To assess the source of uranium in these lacustrine deposits, the AA. have also analyzed uranium and its isotopic
Immature and mature calcretes from an alluvial terrace sequence in the Sorbas basin were dated by the U-series isochron technique. By using this technique to date calcretes that have formed during terrace aggradation and at the terrace surface after
terrace abandonment it is possible not only to date the timing of terrace aggradation but also to constrain the age at which the river switched from aggradation to incision. This approach, therefore, constrains the timing of changes in fluvial processes
more reliably than any currently used geochronological procedure and is appropriate for dating terrace sequences in dryland regions worlwide, wherever calcrete horizons are present.
This study aims to determine the neotectonic activity of the Manisa Fault and the most recent time of the change in its stress condition through age-dating data obtained by using 230Th/234U dating methodology applied on the calcite coating
Analyses Th/U des dépôts meubles pléistocènes des basses terres du Saint-Laurent, dans le but de tester la méthode U-trend de Rosholt, en principe applicable à la datation des systèmes ouverts. A défaut d'apporter une confirmation de la validité de
cette méthode, l'étude permet de conclure que l'analyse des déséquilibres Th/U dans les dépôts meubles présente un intérêt intrinsèque pour ce qui concerne le calcul des radiations ambiantes à des fins de datation par les méthodes physiques indirectes.
U-series dating by the TIMS technique of land snails from paleosols in the Canary Islands
Canary Islands ; Dating ; Fauna ; Isotope dating ; Methodology ; Palaeo-ecology ; Palaeosol ; Uranium
A sequence of seven superimposed paleosols developed on eolian calcarenites and alluvium was sampled on the island of Lanzarote in order to examine the possibility of dating land snail shells by the U-series method, using a TIMS technique allowing
measurement of U and Th isotopes in very small samples.