<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Recent work has identified IR stimulated luminescence signals at elevated temperature from both potassium- and sodium-rich feldspars that have much lower anomalous fading rates than the conventional signal measured using IR stimulation at 50°C. This paper examines the stability of these signals for potassium-rich sedimentary feldspars. We show that the natural post-IR IRSL (pIRIR) signal from a 3.6 Ma old sample is in apparent saturation on a laboratory generated dose response curve, i.e. it does not show detectable fading in nature although a low fading rate is observed on laboratory time scales. We show that the pIRIR signal has a greater thermal stability than the IRSL signal and that the trend in increasing thermal stability is mirrored by a decreasing fading rate. We also investigate the effect of preheat temperature and IR stimulation power on the decay shape and conclude that the data can be explained in terms of either a single- or multiple-trap model. We present evidence that may suggest that at least part of pIRIR signal is derived from a high temperature trap (∼550°C thermoluminescence (TL) peak), although again the data can also be explained in terms of a single-trap model. Finally, we present dose response curves and characteristic curvature constants (D0) values for various IRSL signals and conclude that the more stable signals saturate more quickly than the less stable signals and that the initial and final signals saturate at approximately the same level.</abstract>

Radiation Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000, Roskilde, Denmark

Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000, Roskilde, Denmark

Stability of IRSL signals from sedimentary K-feldspar samples

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The luminescence dating of the K-feldspar fraction is an alternative way for samples that cannot yield reasonable equivalent dose (De) from quartz fraction with very weak luminescence signal. For testing the reliability of the infrared stimulated luminescence (IRSL) dating of K-feldspar, luminescence dating was applied to quartz and K-feldspar fractions respectively for several Holocene samples in this study. K-feldspar apparent ages using routine single aliquot regenerative-dose (SAR) protocol, K-feldspar ages using g value correction method and ages from isochron dating method were compared with quartz ages. It is found that the g value correction method cannot give reliable ages due to the large errors induced during measurements. The isochron dating method is effective to the sample with problematically external dose rate. However, isochron dating may introduce a relatively greater error during grain sizes — De curve fitting, therefore this method could obtain low-resolution ages for Holocene samples. Even K-feldspar apparent age from routine SAR protocol is relatively younger by about 10% than the quartz age, it still could establish reasonable chronological framework for Holocene samples.</abstract>

Key Laboratory of Western China’s Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou, China

Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, China

Comparison of three K-feldspar luminescence dating methods for Holocene samples

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The infrared radiofluorescence (IR-RF) dating technique was applied to eight fluvial samples that were collected from two sediment cores at the Heidelberg Basin located near Viernheim and Ludwigshafen in southwest Germany. Based on the IR-RF derived ages of the samples it was possible to establish a chronological framework for the Mid-Pleistocene fluvial deposits of the Heidelberg Basin. The results allow us to distinguish between four main periods of aggradation. The lowermost sample taken from 100 m core depth lead to an IR-RF age of 643 ± 28 ka pointing to a Cromerian period of aggradation (OIS 17–16). For the Elsterian it is now possible to distinguish between two aggradation periods, one occurring during the Lower Elsterian period (OIS 15) and a second during the Upper Elsterian period (OIS 12–11). For the so called Upper interlayer (or “Oberer Zwischenhorizont” — a layer of organic-rich and finer-grained deposits), the IR-RF results point to a deposition age of around 300 ka, with samples taken directly on top and out of this layer yielding IR-RF ages of 288 ± 19 ka and 302 ± 19 ka, respectively. Hence, the measured IR-RF ages clearly point to a deposition during the Lower Saalian period (OIS 9–8) whereas earlier studies assumed a Cromerian age for the sediments of the Upper Interlayer based on pollen records and also mollusc fauna. The new IR-RF dataset indicates that significant hiatuses are present within the fluvial sediment successions. In particular the Eemian and Upper Saalian deposits are missing in this part of the northern Upper Rhine Graben, as the 300 ka deposits are directly overlain by Weichselian fluvial sediments. It is obvious that time periods of increased fluvial aggradation were interrupted by time periods of almost no aggradation or erosion which should have been mainly triggered by phases of increased and decreased subsidence of the Heidelberg Basin.</abstract>

Leibniz Institute for Applied Geophysics, Stilleweg 2, 30655, Hannover, Germany

Sächsische Akademie der Wissenschaften zu Leipzig, Quaternary Geochronology Section at Institute of Applied Physics, TU Bergakademie Freiberg, Bernhard-von-Cotta-Str. 4, 09596, Freiberg, Germany

Hessian Agency for Environment and Geology (HLUG), Rheingaustraße 186, 65203, Wiesbaden, Germany

Agency for Geology and Mining Rheinland-Pfalz (LGB), Emy-Roeder-Str. 5, 55129, Mainz-Hechtsheim, Germany

Infrared radiofluorescence (IR-RF) dating of middle pleistocene fluvial archives of the Heidelberg Basin (Southwest Germany)

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">We report on SAR-OSL dating of closely-spaced samples from the loess-palaeosol sequence near Mostiştea lake (Danube Plain, SE Romania). We used sand-sized quartz and a SAR protocol that involved a preheat of 10s at 220°C and a test dose cutheat to 180°C. It is shown that these thermal pretreatments isolate a quartz OSL signal that is dominated by the fast component. The behaviour of this signal in the SAR protocol is then documented. The ratio of the measured to given dose tends to lie slightly but systematically above unity (∼5% on average) and the recycling ratio below unity (∼6% on average); for all samples, the recuperated signal is negligible. Within analytical uncertainty, the nineteen optical ages are internally consistent and agree with the predictions from a palaeomagnetic age-depth model. Although it may be possible to optimize the SAR measurement procedure, the optical ages already confirm the chronostratigraphic position of the uppermost welldeveloped palaeosol in that it formed during MIS 5. The established chronology allows correlating the sequence near Mostiştea lake with that near Mircea VodĂ that we investigated earlier.</abstract>

Faculty of Environmental Science, Babes-Bolyai University, Fântânele 30, 400294, Cluj Napoca, Romania

Laboratory of Mineralogy and Petrology (Luminescence Research Group), Department of Geology and Soil Science, Ghent University, Krijgslaan 281 (S8), B-9000, Ghent, Belgium

Faculty of Physics, Paleomagnetic Laboratory, University of Bucharest, N. Bălcescu 1, 010041, Bucharest, Romania

A high resolution optical dating study of the Mostiştea loess-palaeosol sequence (SE Romania) using sand-sized quartz

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Quartz is the datable component in mortar. Although its luminescence properties are very well studied, the problem of mortar dating arises from a low level of optical bleaching. In order to reduce the time consuming efforts for dating lime mortar in monuments by optically stimulated luminescence, we investigated the most suitable methods of dose and dose rate determination, and we explored tests which are suitable to predict the datability of a given material. Reverting to the large number of publications on sedimentary partially bleached quartz we found linear modulation techniques especially useful, equally we also recommend the determination of the level of optical depletion before starting analyses. Single grain analysis is regarded as an ultimate but infallible tool to date very poorly bleached quartz from mortar. Dose rate measurements need to take into account the radioactive equilibrium of the uranium decay and the short range inhomogeneity of the environmental gamma radiation field: gamma spectrometry and on-site TLD measurements are best suited.</abstract>

Dating mortar by optically stimulated luminescence: A feasibility study

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Extraterrestrial events and the extraterrestrial origin of both material and impact forms were recognized in the Morasko, Kaali and Przełazy shallow geological profiles by means of luminescence and radiocarbon dating as well as the frequency of magnetic spherules. The obtained results provide a promising tool for proving theat extraterrestrial events affected characteristic lithological and morphological environmental features.</abstract>

Higher School of Economy (WSG), Garbary 2, 85-229, Bydgoszcz, Poland

Adam Mickiewicz University, IG, Maków Polnych 16, 61-606, Poznań, Poland

Luminescence and radiocarbon dating as tools for the recognition of extraterrestrial impacts

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">St Martin’s church, Angers, is emblematic of the problems raised in pre-12th century history of architecture.In view of the importance of this building, it was necessary to attempt to define its dating and this study particularly focuses on its bell-tower. In addition to the conclusion resulting from the interpretation of written sources and typological criteria positioning the construction of the site at the beginning of the 11th century, not only a significant number of 14C dates were carried out on charcoals from the masonry structures, but also independent dating by archaeomagnetism and thermoluminescence were performed on bricks from the bell-tower. The whole results from these three different methods agree and indicate the lower level of the bell-tower was likely built in the 9th century, disputing evidence to the theory of construction in the 11th century of the church.Presented here are the detailed results obtained from the thermoluminescence (TL) dating analysis.</abstract>

IRAMAT-CRP2A — UMR 5060, CNRS, Université de Bordeaux, 3, Pessac, France

Service archéologique départemental de Maine-et-Loire, Maine-et-Loire, France

IRAMAT-CRP2A, Géoscience-Rennes-Université de Rennes, 1, Rennes, France

Centre de datation par le RadioCarbone, Université de Lyon, 1, Lyon, France

Laboratoire Artehis — UMR 5594, CNRS, Université de Bourgogne, Dijon, France

Combined dating methods applied to building archaeology: The contribution of thermoluminescence to the case of the bell tower of St Martin’s church, Angers (France)

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The known from literature Żabinko site is situated in the Warta Pradolina, within the dune field occurring on the bifurcation terrace. In the site we found fluvial, fluvio-aeolian and aeolian deposits, paleosols, and organic infillings of the inactive river channels. The purpose of the study was to determine stratigraphic position of the deposit units distinguished on the basis of lithofacial analysis, pedological description and thermoluminescence dating. The obtained results well correspond to the previously published ones, and new units were also found.</abstract>

Department of Physical Geography and Paleogeography, Maria Curie-Skłodowska University, Kraćnicka 2cd, 20-718, Lublin, Poland

Department of Marine Geology, University of Gdańsk, Piłsudskiego 46, 80-950, Gdańsk, Poland

Department of Geomorphology and Quaternary Geology, University of Gdańsk, Bażyńskiego 4, 80-950, Gdańsk, Poland

Department of Soil Science, Nicolaus Copernicus University, Gagarina 9a, 87-100, Toruń, Poland

Stratigraphic position of fluvial and aeolian deposits in the Żabinko site (W Poland) based on TL dating

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">A radiochemical study was carried out on massive sulfides from Semyenov hydrothermal district at the Mid-Atlantic Ridge. New and published results provide evidence that 230Th/U ages obtained for massive sulfides are reliable. The sulfide deposits from the West, North-West, North-East, and East hydrothermal sites at the Semyenov hydrothermal district were formed between ∼124 ka and ∼37 ka ago. The hydrothermal activity might have started in the eastern part of the district and moved to the west by episodic ore formation.</abstract>

St. Petersburg State University, V.O., 10-th Line 33, 199178, St. Petersburg, Russia

Institute for Geology and Mineral Resources of the Ocean (VNIIOkeangeologia), Angliysky Prospect 1, 190121, St. Petersburg, Russia

Polar Marine Geosurvey Expedition, Pobedy Str. 24, 198412, Lomonosov, St. Petersburg, Russia

230Th/U chronology of ore formation within the semyenov hydrothermal district (13°31′ N) at the Mid-Atlantic ridge

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The estimation of soil erosion rates in complex subtropical agricultural systems of hilly environment is difficult and most of the traditional methods have serious limitations. The 137Cs technique allows to obtain relatively quickly retrospective medium term soil erosion results. The objective of this study was using 137Cs approach to quantify soil loss under agricultural system which develops under growing human pressure on the hilly terrain of the Meghalaya Plateau. The measured values of caesium inventory for all sampling points are between 2% and 63% of the reference value of caesium inventory. The estimated annual soil loss for sampling points located on the slope are between 29 and 79 Mg·ha−1·yr−1 in the case of an improved mass balance model. It means that soil erosion in this manually tilled agricultural area cannot be neglected.</abstract>

Department of Radioisotopes (GADAM Centre of Excellence), Institute of Physics, Silesian University of Technology, Krzywoustego 2, 44-100, Gliwice, Poland

Department of Geomorphology and Hydrology, Institute of Geography and Spatial Organization, Polish Academy of Sciences, Jana 22, 31-018, Krakow, Poland

Estimation of soil erosion on cultivated fields on the hilly Meghalaya Plateau, North-East India

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">In recent years, a team at the Geology and Paleogeography Unit, Marine Sciences Institute, University of Szczecin, has been performing geological, geochronological and paleogeographic surveys in (i) the Szczecin Lagoon and Świna Gate Sandbar and (ii) the estuary section of the Rega river valley near Mrzeżyno. These studies have helped to examine and identify not only the distribution of fossil marine sediments but also their lithological and sedimentological characteristics. The age of marine ingressions and regressions in the coastal zone of the Pomeranian Bay were determined using approximately 170 radiocarbon assays.It was found that the marine ingression associated with the ‘Littorina transgression’ was not synchronous at these two areas. It started earlier in the Mrzeżyno area, ca. 8300-8200 cal BP. In that first phase, marine sediments developed as tightly packed sands containing a few fragments of shells. In several profiles, these deposits were separated from the bottom and top with layers of peat, thus allowing an indirect determination of their age. The next phase of ingression began about 7300 cal BP. These younger marine sediments already contained quite numerous shells of marine malacofauna, especially Cardium glaucum, often found in a life position.In the area of the Szczecin Lagoon and Swina Gate Sandbar, the oldest marine ingression started as early as about 7350 cal BP. The quite clear trace is a considerably thicker series of marine sands with numerous sea shells representing marine and brackish-marine environments, including Cardium glaucum shells in a life position, which made it possible to identify the age and the rate of accumulation of marine sands.</abstract>

Holocene marine ingressions in the coastal zone of the pomeranian bay based on radiocarbon assays

AHEAD OF PRINT

Volume 50 (2023): Issue 1 (January 2023)

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Volume 38 (2011): Issue 3 (September 2011) Special Issue Title: Proceedings of the 2nd Asia Pacific Conference on Luminescence Dating, Ahmedabad, India, 2009. Part II Issue Editors: Andrzej Bluszcz, Silesian University of Technology, Gliwice, Poland. Andrzej.Bluszcz@polsl.pl Sheng-Hua Li, The University of Hong Kong, Hong Kong, China. shli@hku.hk Ashok Kumar Singhvi, Physical Research Laboratory, Ahmedabad, India. singhvi@prl.res.in

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Volume 37 (2010): Issue -1 (December 2010) Proceedings of the 2 Asia Pacific Conference on Luminescence Dating, Ahmedabad, India, 2009. Part I
Editors	Andrzej Bluszcz, Sheng-Hua Li and Ashok Kumar Singhvi

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Geochronometria

Geochronometria is a multidisciplinary journal on Methods and Applications of Absolute Chronology. The title is owned by the Institute of Physics - Centre for Science and Education at the Silesian University of Technology in Gliwice, Poland. We encourage the submission of papers devoted to developing the methodology of various numerical dating methods and their applications. The journal integrates scientists who apply these methods in various fields such as:   geology, palaeoclimatology, palaeobiology, hydrology, geography, archaeology.  The methods employ, among others:   OSL (optically stimulated luminescence), radiocarbon, dendrochronology, TL (thermoluminescence), EPR (electron paramagnetic resonance), stable isotopes, isotopes of natural decay series, varve chronology.   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 