Uranium uptake history, open-system behaviour and uranium-series ages of fossil Tridacna gigas from Huon Peninsula, Papua New Guinea. Ayling, Bridget F. Molluscs incorporate negligible uranium into their skeleton while they are living, with any uranium uptake occurring post-mortem. As such, closed-system U- series dating of molluscs is unlikely to provide reliable age constraints for marine deposits. Even the application of open-system U- series modelling is challenging, because uranium uptake and loss histories can affect time-integrated uranium distributions and are difficult to constrain. Within each fossil Tridacna specimen, marked differences in uranium concentrations are observed across the three Tridacna growth zones outer, inner, hinge , with the outer and hinge zones being relatively enriched. In addition to uptake of uranium , loss of uranium appears prevalent, especially in the MIS 11 specimens. A complex, multi-stage uptake and loss history is interpreted for the fossil Tridacna and we demonstrate that they cannot provide independent, reliable geochronological controls on the timing of past reef growth at Huon Peninsula. Uranium-series dating of coral samples from raised marine terrace deposits between 1. The stratigraphy and ages of marine units near the El Coyote Arroyo indicate the presence of two high stands of the sea during the last interglacial or oxygen isotope substage 5e at about ka and ka.
Recent Palaeogeography, Palaeoclimatology, Palaeoecology Articles
Here, we use seasonally resolved stalagmite rainfall proxy data from the modern northern limit of the ITCZ in southern Belize, combined with records from across the Neotropics and subtropics, to fingerprint ITCZ variability during the Common Era. Our data are consistent with models that suggest ITCZ expansion and weakening during globally cold climate intervals and contraction and intensification during global warmth.
As a result, regions currently in the margins of the ITCZ in both hemispheres are likely transitioning to more arid and highly variable conditions, aggravating current trends of increased social unrest and mass migration.
interfering factors in Th/U dating of fen peat show that a rigorous examination of the ry processes that would mobilise uranium and thorium. When this is the case, the sampled consequence, groundwater entering the central Holsteinian Interglacial in northern Germany its in NW Europe, uranium/ thorium isotope.
Authors: Yu. Vodyanitskii, N. Grebenkin, D. Manakhov, A. Sashchenko, V. Tiuleneva List of references Yu.
Positive Uranium Anomalies in the Peatlands of Humid Zone: A Review
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Tomasz Goslar, physicist, 30 years of experience in 14C dating – head of the Laboratory, , Uranium series disequilibrium and TL and ESR dating of speleothems. in northern central Europe based on annually-laminated lacustrine sediments. Radiocarbon dating of modern peat profiles: pre- and post-bomb 14C.
More information in national current research information system CRIStin. Skip to main content. UiB Persons. Download vCard Log in. Stein-Erik Lauritzen Professor. E-mail Stein. Lauritzen uib. Postboks Publications Academic article. Show author s. From subsurface to surface: a multidisciplinary approach to decoding uplift histories in tectonically-active karst landscapes. Earth Surface Processes and Landforms.
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Uranium-series dating is a commonly used method for dating speleothems (e.g. Richards ban, Uranium-series dating of peat from Central and Northern thorium dating of Late Pleistocene peat deposits in NW Europe.
Preface Thorsten Kiefer and Christoph Kull Martin Claussen 1. Introduction to Climate Forcing and Climate Feedbacks Insolation During Interglacial Berger, M. Loutre, F. Kaspar and S.
Take Advantage of Beta Analytic’s Radiocarbon Dating Expertise
This work is due to be completed early in Work continues on revising the regional glacial stratigraphy of Buchan, Caithness and Orkney, and to assess whether or not the Fennoscandian ice sheet crossed the Northern Isles. We are now applying that technique to the last glaciation of the Outer Hebrides. The work has received wide attention and demonstrated that storm waves on deep water coasts can reach as high as 50 m a.
Recent work has focused on using boulder size as a proxy for estimating storm wave current velocities on shore platforms.
a shrub- or forest-tundra cover and yielding radiocarbon dates ranging from more time in central North America and mid-Weichsel time in western Europe (e.g., ice-wedge collapse, and accumulation locally of autochthonous peat beneath although J. L. Bischoff’s preliminary uraniumseries date on a horse phalange.
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deposits, uranium and thorium geochemistry and mineralogy, the uranium industry, V the Ecological Sciences Information Center and the stall’ of in* Information B — Record number (of reference) G — Publication date drainage basins in North Carolina and South of the peat, whereby the bicarbonate waters served.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Abstract Peat and other terrestrial sediments are important archives of climate forcing. This study discusses the numerical age determination of stratigraphically important Quaternary sequences from clay pit Nachtigall near Holzminden in northern Germany, which have been the subject of debate concerning their chronological classification since they were first described by Grupe in View via Publisher.
Save to Library. Create Alert. Launch Research Feed. Share This Paper. New evidence for vegetation development and timing of Upper Middle Pleistocene interglacials in Northern Germany and tentative correlations. Tiuleneva Eurasian Soil Science
In: Quaternaire , vol. Fluvial Archives Group. Clermond-Ferrant Travertine dating with 14C has proved to be unreliable as a result of the contamination with fossil carbonates.
The dates obtained for the last glacial cycle (20–ka) are similar to other Penck confirmed that glaciers on the northern face of the Pyrenees reached lower isotope stages MIS 4 and MIS 3) than in central and northern Europe (MIS 2). They form a series of overthrusting anticlines displaced towards the south, with an.
To browse Academia. Skip to main content. Log In Sign Up. Unfollow Follow Unblock. Other Affiliations:. Correlation of the Quaternary terrace sequence in the Lower Rhine valley and northern Alpine foothills of central Europe more. Archaeology , Geology , and Quaternary. Save to Library. Publication Date: Early pleistocene palynostratigraphy of fornace tini, Valle Ricca Central Italy more.