Stein-Erik Lauritzen

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Recent Palaeogeography, Palaeoclimatology, Palaeoecology Articles

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Rowe, P. J. and T. C. Atkinson () Uranium – thorium dating results from Time-transgressive deglacial retreat of Polar water from the North Atlantic. palynological investigations of the Higher Moors and Lower Moors peat mires. an explanation of the post mid-Cretaceous subsidence of the Central North Sea Basin.

Climate change. Geology of Britain. Peat cores are used to reconstruct the accumulation of peat, through analysis of sample slices taken at intervals down a core. In ombrotrophic peat bogs, for which accumulated material is derived from the breakdown of plants, there is no mineral source of natural radioactivity within the layers of peat. Where the peat has not been disturbed by erosion, such as from rivers or human activity, it can accumulate a continuous record of atmospheric deposition of minerals to the land surface.

In order to make this archive relevant to the history of landscape evolution and records of human activity, it is important that the layers of peat can be dated. The age-dating provides a chronological context to the other measurements, such as organic markers or chemical pollutants.

Uranium- series dating of peat from central and northern europe

View exact match. Display More Results. It can form on higher ground like plateaus.

Uranium-series dating of fossil bones from the Canyon Creek vertebrate Map of a part of south-central Alaska showing extent of. Wrangell M Peat or muck. G Pond affinities with Paleocene faunas of northern Europe.

Peatlands are globally significant carbon reservoirs, and also comprise rich archives of past climatic and environmental change and carbon flux. This issue of PAGES news spotlights recent applications of peatland archives relevant to understanding the past, present and future of Earth. This composite image shows components of peatlands at varying scales; an aerial photo of an Alaskan peatland, a New York peatland at ground-level, an excavated Argentinean peat section, a close up of a Sphagnum moss peatland surface, and a photomicrograph of Sphagnum leaf cells.

Photo credits on back cover. The first, edited by Xiaoping Yang and Louis A. Ridgwell and Schmidt compare the two major carbon cycle perturbations, that of today and of the Paleocene-Eocene Thermal Maximum, to provide “Past constraints on the vulnerability of marine calcifiers to massive carbon dioxide release”.

Alan Mix, a Professor at the College of Oceanic and Atmospheric Sciences, Oregon State University, is a paleoceanographer with a broad background spanning stable isotope geochemistry, micropaleontology and marine geology, reconstructing hydrographic conditions and global-scale circulation changes on orbital and millennial timescales. He has a wide range of experience in Quaternary research and paleoclimatic reconstructions, and has worked in diverse environments from Greenland to China.

His central area of expertise is in eolian deposits loess and the associated climatic and environmental conditions. Furthermore, he has done a lot for the international paleocommunity, as former vice president of INQUA, cofounder and co-chief-editor of the openaccess journal Climate of the Past, and as current president of the Climate division of the EGU. Chris’s research interests are varied, which has led to his substantial contributions to a range of areas including dating techniques, isotopic studies, archeology, climate science, fire and tree ring analysis.

This WG will focus on climate evolution and abrupt climate changes over the last 21 ka. PAGES networking online PAGES is now on Facebook and invites everyone to join or become a “fan” in Facebook jargon to receive real-time alerts and updates on science findings, events, jobs and other news relevant to paleoresearch.

Uranium-series dating of fen peat horizons from pit Nachtigall in northern Germany

Taking the necessary measures to maintain employees’ safety, we continue to operate and accept samples for analysis. Analyze only the most suitable samples to optimize your budget. Biomedical samples not accepted to prevent cross-contamination.

Richards DA () Uranium-series chronology and environmental North Island of New Zealand and their palaeoenvironmental interpretation. The Holocene – Sphagnum A genus of bryophytes commonly known as ‘​bog’ or ‘peat’ moss, DZR Daniels RE and Eddy A () Handbook of European Sphagna.

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Quaternary international : the journal of the International Union for Quaternary Research

Radionuclides in peat bogs and energy peat. The study was aimed at improving the general view on radionuclides contents in energy peat produced in Finland. The annual harvest of fuel peat in was studied extensively. Also thirteen peat bogs used for peat production and one bog in natural condition were analysed for vertical distributions of several radionuclides. These distributions demonstrate the future change in radioactivity of energy peat.

Uranium Series Accessory Crystal Dating of Magmatic Processes Accessory mineral dating of volcanic rocks and cognate plutonic xenoliths of the fertile crescent crop package in southwest Asia and Europe (after Zohary & Hopf ). of carbon to the atmosphere in the past 7, years: (a) small peat burial and an.

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 new thread is to model the impact of storm waves on the amazing sea caves on Shetland. Scotland is an excellent location in which to study how rapidly shore platforms are lowered through erosion because its shorelines provide examples of mixed rock types subject to variable wave energy and different rates of isostatic uplift.

Most estimates of erosion rates come from short-term studies, but this new work promises to provide down-wearing rates over periods of ka. Future work will examine inheritance of bedrock forms on coasts in Scotland, comparing field evidence to the duration of shoreline occupancy inferred from models of local sea level change. The ice divide zone in northern Sweden and northern Finland offers many opportunities to study the variable impact of glacial erosion, long-term development of shield landscapes and the significance and age of deep weathering episodes.

This work has great promise for improving our understanding of the development of landforms on the shield areas of the Northern Hemisphere. New work with Pertti Sarala of GTK explores how till geochemistry links to glacial erosion and transport. With Johan Kleman, we have challenged the applicability of the glacial buzzsaw hypothesis to glaciated passive margins. The INK research facility in the Peloponnese provides exciting possibilities to explore landform inheritance in terrain with rapid tectonic movements.

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Preface Thorsten Kiefer and Christoph Kull Martin Claussen 1. Introduction to Climate Forcing and Climate Feedbacks

Uranium-series dating (Th/U) of different organic horizons as well as sedimentology, 8. Uranium-series dating of peat from central and Northern Europe.

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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.

APPENDIX 7: UK SPELEOTHEM URANIUM SERIES DATES. analysis of Mosedale peat. A UK cave analyses are spread evenly between south and central. Britain, are located in Europe and North America and so likewise.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. By establishing a luminescence-based chronology for fluvial deposits preserved between the Elsterian- and Saalian tills in central Germany, we obtained information on the timing of both the Middle Pleistocene glacial cycles and early human appearance in central Europe.

The luminescence ages illustrate different climatic driven fluvial aggradation periods during the Saalian glacial cycle spanning from — ka. The ages of sediments directly overlying the Elsterian till are approximately ka and prove that the first extensive Fennoscandian ice sheet extension during the Quaternary correlates with MIS 12 and not with MIS

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