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Found 63 datasets

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Luminescence dating of heated silex - Potential to improve accuracy and precision and application to Paleolithic sites

Thermoluminescence (TL) dating of heated silex artefacts represents an important chronometric tool for Middle to Upper Paleolithic archeological contexts. Since the firing of these lithics can legitimately be attributed to human agency, this method provides direct age estimates of the occupation of a site. However, in relation to other dating methods, the precision of TL dates is comparatively low, and the often observed “overdispersion” in ages of obviously syndepositional finds indicates additional...
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On the luminescence signals of empty sample carriers

Luminescence dating is a leading technique for a large spectrum of Quaternary dating applications. Since the development of automated reader systems, handling great amounts of samples has become possible. A large quantity of data is produced in a short time and a detailed check of every single curve is often impractical. Therefore, it is important to be confident in excluding any kind of unwanted signal contributions, such as those from sample carriers. For commonly used types of steel and aluminium...
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Quantification and spatial distribution of dose rate relevant elements in silex used for luminescence dating doi

Thermoluminescence (TL) is routinely used to date heated lithic artefacts which mostly consist of silex (a mixture of amorphous opal and microcrystalline chalcedony). Analytical investigations of bulk samples confirmed that these materials contain considerable concentrations of radioactive elements, generating an internal dose rate contribution. Common dosimetric models assume the latter to be homogeneous throughout the sample. If this assumption would prove invalid, this will result in systematic errors in...
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Assessment of radionuclide distribution in silex by autoradiography in the context of dose rate determination for thermoluminescence dating doi

A combination of two autoradiography methods was applied to investigate the radionuclide distribution patterns in a range of different silices. We obtained greyscale images (β-radiation) and α-track patterns for qualitative assessment, and used a statistical approach to quantify the degree of uniformity of the radiation fields. It was found that almost all samples are poor in potassium, thorium and uranium, and that locally high concentrations are present only in dark-coloured veins and inclusions....
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First chronometric dates (TL and OSL) for the Aurignacian open-air site of Româneşti-Dumbrăviţa I, Romania doi Spatial

Currently, absolute dates for the emergence of the Early Upper Paleolithic and the timing of the earliest dispersal of anatomically modern humans (AMH) into Europe are sparse. This is especially true for regions adjoining the Eastern Mediterranean and Central Europe with its dense clusters of sites along the Austrian and German Danube Valley. This article makes a first step toward filling this gap and, for the first time, presents absolute ages for the open-air site of Româneşti-Dumbrăviţa I (Banat, SW...
Keywords: LRQ1
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Gradual aridification of the Sahara during the last 11,000 years revealed by plant wax δD analyses of Lake Yoa (Chad) Spatial

It is still an ongoing debate whether the transition of the last ‘green Sahara’ period to today’s large desert during the Holocene, the African Humid Period (AHP), was a progressive or an abrupt change in hydrological conditions. Several climate records mainly from East Africa suggest a rapid decline of moisture availability at the end of the AHP including new data from a marine sequence off the Horn of Africa (Tierney & deMenocal, 2013). Other archives including sedimentological,...
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The Palaeolithic site Sima de Las Palomas de Teba, Southerrn Spain – Site formation processes and chronostratigraphy Spatial

Abstract (The Palaeolithic site Sima de las Palomas de Teba, Southern Spain Site formation processes and chronostratigraphy: The rockshelter sequence consists of 6 m thick stonerich silty clay loam including several archaeological levels with artefacts of Mousterian affinity, bone and charcoal. Stratigraphy and site formation processes were characterised by sedimentological, geochemical and micromorphological investigations. Sediments were dated using IRSL and OSL and the time of the last heating of burnt...
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Luminescence dating Project D1 Rhineland Spatial

Luminescence ages and additional information about palaeodose estimation and dosimetry. Optically stimulated luminescence dating was carried out on 20 quartz and feldspar samples using different measurement protocols (OSL, postIR IRSL @ 290 °C). Most quartz samples from the Remagen site suffer from a thermally unstable medium component, therefore quartz ages are unreliable. Further post IR IRSL dating is in progress.
Keywords: irsl luminescence osl
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Luminescence dating Project C1 Spain Spatial

Luminescence ages and additional information about palaeodose estimation and dosimetry. Optically stimulated luminescence dating was carried out on 23 quartz and feldspar samples using different measurement protocols (OSL, IRSL, postIR IRSL at various temperatures). Thermoluminescence dating of heated silex was applied to 5 samples using a SAR protocol.
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Luminescence dating Project C1 Portugal Spatial

Luminescence ages and additional information about palaeodose estimation and dosimetry. Thermoluminescence dating of heated silex was applied to 8 samples using various measurement protocols (SAR, MAAD).
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Luminescence dating Project B4 Turkey Spatial

Luminescence ages and additional information about palaeodose estimation and dosimetry. Optically stimulated luminescence dating of fluvial and lacustrine deposits was carried out on 6 quartz samples and 1 polymineral fine grain sample. Only little sample material was left of the three fluvial samples. Palaeodose measurements revealed zero doses from which we concluded that either the samples are modern or are not suitable for dating. No further measurements were carried out because of only little sample...
Keywords: irsl luminescence osl
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Luminescence dating Project A1 Egypt Spatial

Luminescence ages and additional information about palaeodose estimation and dosimetry. Thermoluminescence dating of heated silex was applied to 3 samples using various measurement protocols (SAR, MAAD).
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