EP41A Fluvial fan evolution during Late Quaternary climate changes: field and chronological constraints from the Indo—Gangetic basin. Abstract: The stratigraphic evolution of fluvial fans is to a large extent governed by channel avulsion. Spatial variations in alluvial architecture are influenced by avulsion magnitude and frequency. However due to the absence of long—term chronostratigraphic records of fan stratigraphy, it has proved difficult to test patterns of fan evolution against records of climate variability. In order to understand the processes of channel avulsion during fan evolution, it is important to determine the spatio—temporal pattern of fluvial channel aggradation, incision, and migration. In this study, we reconstruct the shallow sub—surface alluvial stratigraphy of fluvial fan systems formed by the major Himalayan rivers, the Sutlej and Yamuna, in the northwestern Indo—Gangetic basin. We map the spatial distribution of channel sand bodies deposited by these rivers and develop a chronostratigraphic model for the fluvial succession in a depositional dip perpendicular transect. Discontinuous channel sand bodies are separated by floodplain fines which occasionally show weak pedogenesis that mark the end of episodes of channel aggradation.
Optically stimulated luminescence OSL dating has been applied to determine the burial age of sediment horizons within a sequence containing Lower Palaeolithic artefacts on an upland site associated with a solution feature doline at West Cliffe, located on the North Downs in Kent, UK. A detailed examination of the uniformity of the distribution of radionuclide sources in the sampled volumes was also performed and this included the application of a spatially-resolved technique for beta dose rate measurement.
The OSL ages, obtained for the burial of brickearth positioned stratigraphically below and above a clay and flint clast layer containing the artefacts and debitage, place the deposition of the artefacts to between ca and 80 ka ago. If displacement occurred on other upland sites this finding has important implications for establishing the timing of hominin use of the upland areas which, beyond broad attribution to Lower or Middle Palaeolithic origin, is uncertain and similar doubts apply to the interpretation of the environments that prevailed.
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Contact Professor Ian Bailiff email at ian. After reading physics at Sussex University Ian Bailiff joined the Research Laboratory for Archaeology and the History of Art at Oxford as a postgraduate student and subsequently submitted a research MSc on the development of new luminescence dating techniques. Following a further year working on an instrument development project he came to Durham in as a research assistant on a pottery dating project; following a series of appointments as a Research Fellow he was awarded an SERC Advanced Fellowship, and in was appointed a Lecturer.
He was Head of Department between and He has developed a luminescence dating laboratory with the capability to support both dating and methodological investigation, and his research has included the study of the luminescence properties of minerals, their application to dating and also to radiation dosimetry.
Currently the primary materials of interest are sediments from prehistoric sites and ceramic materials from medieval buildings and structures. Recent work on the dating of brick from medieval buildings of known age has shown that luminescence is capable of providing reliable and accurate results. The work on medieval buildings, combined with an interest in instrumentation, has included collaborative work on the application of infrared thermography to the structural analysis of medieval buildings with Prof.
Danny Donoghue in the Geography Department. Ian is Joint Editor-in-Chief of the journal Radiation Measurements which, within its broad remit of radiation-related research, includes luminescence and ESR dating. This journal is the primary source of information for physics related aspects of these two methods, and since , the journal has included Special Issues devoted to the papers of the International Conference on Luminescence and ESR Dating.
Although the type site for the LGM glaciation of Britain is on the Holderness coast at Dimlington, very poor chronological control is otherwise available for the pattern of advance and recession by the North Sea Lobe NSL , the major outlet of the British-Irish Ice Sheet whose potentially dynamic and pulsed behaviour has been the subject of considerable speculation due to limited chronological control on marginal oscillations.
Not only the dynamics but also the configuration of this large outlet of the BIIS are poorly understood, and existing palaeoglaciological reconstructions depict a glaciologically improbable configuration, with east coast-parallel flow that requires a buttressing ice mass in the North Sea despite the lack of unequivocal evidence for such a shelf-based ice mass1,2.
An alternative scenario is that the forebulge of the Scandinavian Ice Sheet could have confined the flow of the NSL3, although this remains untested. Our understanding is hampered by a lack of knowledge of offshore sediment-landform assemblages and a dearth of dates on their emplacement.
PL EN. Widoczny [Schowaj] Abstrakt. Adres strony. Methodological study on single grain OSL dating of mortars: Comparison of five reference archaeological sites. The paper focuses on single grain OSL dating of quartz extracted from known age archaeological mortars, potentially representing a new tool for dating the construction of historical buildings. Apart from SG-OSL measurements and annual dose rate determination, the samples are systematically studied by means of optical microscopy, EDX-SEM cartography and beta autoradiography in order to evaluate the possible microdosimetric heterogeneity of each sample, arising principally from local variations of potassium content.
The Luminescence Dating and Dosimetry Laboratory is developing new techniques for application to the dating of artefacts and deposits from sites that range widely in terms of chronological period, geographic location and material type. Recent work as focused on optically stimulated luminescence OSL techniques, in particular a novel experimental approach to the measurement of single grain OSL. A study produced, for the first time, absolute dates for a range of brick stupas located within the hinterland of Anuradhapura , contributing to the further development of a brick monument chronology for the region.
Ongoing work is examining whether unfired clay bricks from various sites can be dated accurately. OSL techniques are being applied to date sediment sequences in stratigraphic contexts associated with irrigation systems.
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After reading physics at Sussex University Ian Bailiff joined the Research Laboratory for Archaeology and dating Osl of Art at Oxford as a postgraduate student and subsequently submitted a research MSc on the development of new luminescence dating techniques. Following a further year osl on an projects development project he lab to Durham in as a research assistant dating a luminescence dating project; following a series of appointments as a Research Fellow he was awarded luminescence SERC Advanced Fellowship, and in dating appointed a Lecturer.
He was Head of Department between and. He has developed a luminescence dating lab with the capability to support both dating and methodological investigation, and his research has included the study of the luminescence properties of minerals, their application to dating and also to radiation dosimetry. Currently the primary materials of yes are sediments from prehistoric sites and ceramic materials from medieval buildings and structures.
Recent work on the dating of brick from medieval buildings of known age lab shown that luminescence is capable of providing reliable and accurate results. The work on medieval buildings, dating with an interest in instrumentation, has included collaborative work on the application of research thermography to the structural analysis of medieval buildings with Prof.
Danny Donoghue in the Geography Department. Active areas of research in durham potential doctoral projects can be durham include the lab of:. Ian is Joint Editor-in-Chief of the journal Osl Measurements which, within its broad remit of radiation-related research, includes luminescence and ESR dating. This journal lab the primary source of information for physics related aspects of these two methods, and since , the journal has included Durham Issues devoted to the papers of the International Conference on Luminescence and ESR Dating.
The experimental techniques developed for dating can also be applied to the measurement of radiation dose in the environment using ceramic research, a durham in which the durham has developed world-leading expertise.
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Single-grain De distributions determined for OSL dating of glaciofluvial ice-marginal sediments. Fig. S7. Bayesian sequence modeling of.
Apart from wide application in geology and sediment dating, optically stimulated luminescence dating OSL dating can also be employed to date architectural structures via the dating of construction mortars. Many of these authors stated a difficulty with partial bleaching for a majority of tested samples which makes it impossible to date this kind of material by a standard single aliquot technique, consisting in the analyses of tens or hundreds of grains together.
Thanks to relatively recent developments of single grain attachments that are becoming a more and more frequently used tool for OSL analyses in recent years, the problem of age over-estimation arising from partial bleaching can be overcome. SG-OSL analyses of 35 mortar samples originating from five different monuments will be compared. The objective is to discuss all the aspects from the sample preparation via specificities of the measurement protocol and data evaluation to the age estimation, thereby underlining the importance of material characterization prior to the SG-OSL analysis.
Finally, we will attempt to suggest a convenient analytical protocol for dating mortars by SG-OSL based on currently available analytical methods, and we will assess current advancements as well as persistent limitations. The mortar samples presented in this paper come from the monuments that were all independently dated by other physical archeomagnetism or radiocarbon dating or archaeological and historical approaches.