Arctic, Antarctic, and Alpine Research

The initial preliminary interpretation of the trench wall structure provided indications of recent reactivations of the fault. The footwall of the fault consists of well stratified lagustrine deposits, while the hanging wall consists of poorly stratified scarp-derived deposits. Seven samples, one for each lithologic unit, were collected from the upthrown fault block in order to establish a reliable chronological framework and nine sediment and pottery samples were collected from the downthrown fault block to constrain the timing of the linear morphogenic earthquakes observed in the trench and thus reconstruct the recent seismotectonic behaviour. The OSL ages were obtained from chemically purified quartz and a single-aliquot regenerative-dose SAR protocol was followed for the equivalent dose De determination. Also, the natural radioactivity of soil from the surroundings of the original sample location was assessed, using gamma spectrometry. The dose rates were calculated using the appropriate dose conversion factors and corrected for the humidity content of the surrounding soils. The OSL ages from the upthrown fault block are in stratigraphic order except one sample , but the signal of the five oldest samples occurs above the saturation level of the exponential part of the dose response curve and thus the reliability of the calculated De value for use in dating is uncertain.

The principles of Luminescence Dating

Arctic, Antarctic, and Alpine Research Accepted: Moreover, climate reconstruction in New Zealand provides insight into the amount of climate change that occurred in the Southwest Pacific where zonal circulation is an important integrator of the climate signal. The MIS 4 advance was fractionally larger and is dated by a former ice-marginal lacustrine deposit minimum age with a basal Optically Stimulated Luminescence OSL sediment deposition age of Our findings and a growing number of publications indicate that many temperate valley glaciers reacted differently to the major ice sheets during the Last Glacial Cycle, reaching their maximum extent during MIS 4 rather than during peak global ice volume during MIS 2.

Introduction New Zealand, together with Tasmania and South America, are the only regions to have experienced extensive Quaternary mid-latitude glaciation in the southern hemisphere.

The advent of optically stimulated luminescence (OSL) techniques and the potential for exploring a spectrum from mono-minerallic single grains to polymineral multi-aliquots enhanced the applicability, accuracy and the precision of luminescence dating.

The major goals of this international scientific project are i the systematic collection of all available information concerning active faults, potentially active faults and seismogenic volumes within the broader Aegean Region; ii the quantification of the principal seismotectonic parameters of the different sources as well as their degree of uncertainty; iii to supply an integrated view of potentially damaging seismogenic sources for a better assessment of the seismic hazard of Greece.

The informatic framework of the database follows closely that used for the Italian Database of Individual Seismogenic Sources DISS , which represents the result of more than ten years experience of its Working Group e. This preliminary version of GreDaSS is focused on northern Greece, where we distinguish two main categories of Seismogenic Sources based on their attributes, their expected use, the nature and reliability of data used to define them: They are tested against worldwide databases for internal consistence in terms of length, width, average displacement and magnitude.

This category of sources favours accuracy of the information supplied over completeness of the sources themselves. As such, they can be used for deterministic assessment of seismic hazard, for calculating earthquake and tsunami scenarios, and for tectonic and geodynamic investigations. They are not assumed to be capable of a specific earthquake but their potential can be derived from existing earthquake catalogues. A Seismogenic Area is essentially inferred on the basis of regional surface and subsurface geological data, that are exploited well beyond the simple identification of active faults or youthful tectonic features.

Opposite to the previous case, this category of sources favours completeness of the record of potential earthquake sources over accuracy of source description. In conjunction with seismicity and modern strain data, Seismogenic Areas can thus be used for regional probabilistic seismic hazard assessment and for investigating largescale geodynamic processes. It has been also planned to enrich GreDaSS with other ‘layers’ of information like, for example, the “Fault Traces” associated with latest Pleistocene-Holocene ‘linear morphogenic earthquakes’ Caputo, that affected the investigated region.

Each individual source of GreDaSS will be associated with additional information such as bibliographic references, literature data, geological, seismological or paleoseismological data as well as the most relevant maps, graphs, pictures and drawings. All the information is organized as major layers of a GIS System that enables the user to explore all data types at different scales and levels.

Dating quaternary events by luminescence

We have a well equipped computer teaching laboratory, postgraduate and undergraduate physical geography laboratories, and image processing facilities which provide an important component for teaching and research in remote sensing and geographical information systems GIS. Geochemistry Laboratory B11j Our geochemistry lab is used for sample preparation and research into environmental science areas such as remediation, climate change and supporting undergraduate dissertations.

Sediment Laboratory B11h The sediment laboratory is used for the preparation and analysis of rock, soil and sediment samples for both research and teaching purposes. Teaching Laboratory B06 The teaching laboratory houses all our undergraduate teaching and laboratory based dissertation projects. With space for up to 50 students, subject areas taught include; chemical and microbiological analysis of water and soils, glaciology and rocks and minerals.

then measured (step 3). This procedure yields the measured AF factor r 1, which corresponds to the time interval dose D 1 that corresponds to the TL (OSL) lost during the time interval t, can be estimated by using the calibration factor obtained in the first cycle.

If your browser does not support JavaScript, please read the page content below: These are discussed below. The estimation of De can be done using multiple aliquot MA , single aliquot SA or single grain SG techniques and in each case additive dose or regenerative dose procedures are used. In the additive dose procedures, several laboratory doses of varying magnitude are given additionally on top of the natural dose of a sample, on several identical subsamples of a natural sample so called aliquots.

The luminescence signal from the natural dose, as well as the natural plus added doses is plotted against the added doses zero added dose for the natural and the relation is fitted with a linear or exponential curve, which describes the growth of the luminescence signal with increasing dose growth curve. The additive growth curve is extrapolated to the dose axis to provide an estimate of the equivalent dose.

In the regeneration method, the natural signal is bleached first and then doses are added to construct a luminescence vs.

Participation of the R-centres in the sensitization of the OSL signal

Dating of rock slope failures and rock scarps using novel and classical optical dating techniques The University of Innsbruck Uibk is a striving research and teaching institution in the heart of the Eastern European Alps with a strong research focus on alpine environments and processes. As part of the Uibks doctoral program Natural Hazards in Mountain Regions, we seek a PhD candidate to investigate rock fall and gravitational slope deformation processes in alpine contexts using optically stimulated luminescence OSL dating techniques.

The PhD candidate will be embedded into the multidisciplinary framework of the doctoral program and the Uibk alpine research focus and thus be exposed to the fields of geochronology, geomorphology, geology, remote sensing and the geotechnical sciences. Summer Review of the applications will start April 7st and close May 19th

Optically stimulated luminescence (OSL) dating is well suited to brickearth soils measurement is then carried out in a Riso the methodology, interpretation and evaluation of this OSL dating. The Cave The Spratling Court Farm cave feature is, unusually, boot-shaped with a clear vertical shaft entrance, a horizontal gallery, adit or.

Depending on the type of stimulation source, the phenomenon is termed thermally stimulated luminescence TL or optically stimulated luminescence OSL. The OSL is further divided, based on the colour wavelength of the excitation light source, into Blue Light Stimulated Luminescence BLSL and Infrared Stimulated Luminescence IRSL 4 Description Luminescence dating requires a proper resetting of the previously acquired pre depositional luminescence in the natural minerals into a very low level natural zeroing event , either by exposure to sun light during pre-depositional transportation by wind, water etc.

Following the natural zeroing event and subsequent burial, the natural minerals begin luminescence acquisition afresh from the ionizing radiation alpha, beta and gamma constantly provided by the decay of radioactive elements U , Th , K40, Rb present in the sediments and also from the cosmic rays. For calculating the age, the radiation energy stored in the mineral known as Paleodose and the annual radioactivity rate annual dose from the surrounding sediments has to be calculated.

The time elapsed since sedimentation, i. Sediment sample should be collected in steel pipe to avoid any exposure to sun light. About gm sample is required. In the lab under sub-dued red light condition , chemical treatment, sieving and mineral extraction will be carried out. Both coarse- and fine-grained material can be used for dating.

Integrative Modelling

Links The principles of Luminescence Dating Luminescence dating is used to identify when a sample was last exposed to daylight or extreme heat by estimating the amount of ionising radiation absorbed since burial or firing. This equation very simply expresses the calculations necessary, but it is important to be aware of the factors influencing the two values used.

Heterogeneous sediments and radioactive disequilibria will increase errors on Dr, while incomplete bleaching of the sample prior to burial, anomalous fading in feldspars, and the estimation of past sediment moisture content may all also add to increased errors. The dating of sediments using the luminescence signal generated by optical stimulation OSL offers an independent dating tool, and is used most often on the commonly occurring minerals of quartz and feldspar and, as such, has proved particularly useful in situations devoid of the organic component used in radiocarbon dating.

Quartz has been used for dating to at least ka, while the deeper traps of feldspar have produced dates as old as 1 ma. The use of fine-grain dating for samples such as pottery, loess, burnt flint and lacustrine sediments, and coarse-grain dating of aeolian, fluvial and glacial sediments is regularly undertaken.

TL and OSL measurements were carried out on the Riso TL/OSL (model TL/OSL-DA) reader that can accommodate as many as 48 samples mounted on the turntable. All the TL measurements were recorded in the flowing N 2 atmosphere with a uniform heating rate of 5°C/s.

Van Dissen, Nicola J. Mark Henderson Part 1: Step 1 Chemical Treatment Samples had their outer surfaces removed. Of this removed outer scrapings, g was weighed and dried in an oven in preparation for gamma spectrometer analysis. A plastic cube was then filled with remaining scrapings in preparation for water content measurment. This was carried out overnight until all carbonate was removed by the reaction.

The next step involved ml CBD solution 71 g sodium citrate, 8. After every chemical treatment procedure distilled water was used to wash the sample several times.

The Risø TL/OSL reader

Statistical treatment of OSL data, especially for fluvial sediment Fluvial sediment can contain useful information on recent environmental change and human impacts. Reading this archive requires a good chronology, for which Optically Stimulated Luminescence OSL could be revolutionary. However, fluvial sediment is not ideal for OSL dating, because the mineral grains used for dating need to have been exposed to sunlight prior to their deposition.

Alluvial fan deposits proved amenable for OSL by dating both eolian sand lenses and reworked eolian sand in a matrix of gravel that occurs within the fan stratigraphy. Lacustrine sand in spits and.

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Optically stimulated luminescence dating of artifacts … – NOPR

I have a post-doctoral researcher position open to work on the SFB — Earth Evolution at the Dry Limit project see further details here. This project is a DfG German research council funded Collaborative Research Centre, in its first 4-year phase of funding. The project comprises 22 sub-projects, mainly based at the Universities of Cologne, Bonn, Aachen and Julich and is focussed on understanding how biota and earth-surface processes combine to shape the landscape of hyper-arid regions.

During our walk along the valley we saw the tracks of the Atacama Puma but fortunately not the cat itself. The post-doctoral position is available for 3 years in the first instance, and is within sub-project D The objective of the project is to develop a chronology for key sites within the Atacama desert in collaboration with other sub-projects, and specifically to explore the potential of violet stimulated luminescence for extending the age range of luminescence dating.

Measurements were made using a RISO TL/OSL DA reader fitted with a blue (l= nm) diode array, and a calibrated 90 Sr/ 90 Y beta radioactive source and Electron Tubes type QA photomultiplier.

Geophysics The Geophysics Lab is equipped with computational resources that include an AMD-Opteron quad-core dual-processor workstation, six multicore Mac OS-X desktops and a small two-station network of legacy Sun workstations. Hydrology equipment also includes an ISCO water sampler, Geoguard combination stainless steel bailer, air-lift sampler, and bladder pump, two Campbell Scientific data loggers, four Geokon vibrating wire pressure transducers, a YSI temperature, conductivity, and salinity meter, an Orion pH meter, Hanna dissolved oxygen meter and two electric well sounders.

This will analyze liquid solutions or solids with laser , capable of measuring most periodic chart elements with part per trillion detection limits. Includes the New Wave Research UP nm Laser Ablation System for analysis of solids and programmable automated stage for multi-spot analyses, with spot size as small as 20 microns. The former is for research-grade analyses of stable isotopes of C, H, O and N. The Picarro is configured for stable carbon isotope analyses and is capable of real-time analyses of carbon isotopes in the laboratory or field.

The lab has all the facilities needed for OSL analysis including a dedicated sample preparation lab under constant amber safe-light conditions, which includes a HF-certified fume hood, centrifuge, drying oven, de-ionized water system, full set of sieves, and the required acids and heavy liquids for sample processing. The Luminescence lab is also equipped with a field portable gamma spectrometer for in-situ dose-rate measurements and an AMS hand auger system for core sample collection.

OSL Sample Preparation Laboratory Riso Luminescence Reader Petrography The Department has several research-grade petrographic microscopes, including two Zeiss microscopes with analog and digital photography as well as five additional research microscopes and sixteen student scopes. There are complete sample preparation facilities for rocks and soils, including thin section and probe mount equipment, rock saws and hand-portable and bench mounted rock coring drills.

The Malvern will analyze grain sizes from 0. The lab also includes standard sieve sets, a microdrill for stable isotope sampling and standard thin-section preparation equipment. A saw for splitting cores, core subsample drill, computers and photography equipment are available in the lab.

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Use of a new luminescence profile technique on the same rockfall furthermore outlines a window of time A. Our study illustrates novel and widely applicable approaches for dating rock art that do not require destructive sampling, and results suggest that Barrier Canyon rock art persisted across the transition from the late Archaic into the agrarian Fremont culture in the American Southwest.

Abstract Rock art compels interest from both researchers and a broader public, inspiring many hypotheses about its cultural origin and meaning, but it is notoriously difficult to date numerically. Barrier Canyon-style BCS pictographs of the Colorado Plateau are among the most debated examples; hypotheses about its age span the entire Holocene epoch and previous attempts at direct radiocarbon dating have failed.

Ancient TL Vol. 25 No.1 25 Temperature calibration and MiniSys temperature upgrade for the Risø TL/OSL-DA reader K.J. Thomsen Radiation Research Department, Risø National Laboratory, Technical University of Denmark.

The spatial distribution of radon along lines traversing the fault zones revealed anomalies, clearly connected to the local tectonic structure. Specifically, increased radon signals evolved on the radon background level, in the vicinity of the faults’ axes and the signal-to-background ratio ranged from 2 to The consistency of this pattern confirms that the radon technique is powerful in the detection and mapping of active fault zones.

The recognition and recent tectonic activity of the fault were previously based on mapping, remote sensing analyses and electrical resistivity tomography studies. To understand the Holocene seismotectonic behavior of the Gyrtoni Fault we excavated two paleoseismological trenches. To estimate the timing of past earthquakes using luminescence dating, we obtained twenty five fluvial-colluvial sediment and pottery samples from both the upthrown and the downthrown fault blocks.

Our investigations of luminescence characteristics using various tests confirmed the suitability of the material for OSL dating. We found that the estimated OSL ages were internally consistent and agreed well with the available stratigraphical data, archaeological evidence and radiocarbon dates.

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This result shows that the site excavated in excavation was occupied by the. An excavation in at the site by the State Archaeology Department has yielded potteries and bricks at different levels Using coarse grain of quartz excavated from these artifacts, three samples have been dated using Single Aliquot Regenerative dose SAR protocol. The optically stimulated luminescence OSL ages of the samples are in the range A.

Optically stimulated luminescence dating S Preparation and measurement Three OSL samples were collected at 75, 55 and 33 cm of depth (Calico F1, Calico F2 and OSL measurement. An automated Riso OSL reader model TL-DA was used for OSL measurements and irradiation. Aliquots, containing approximately several hundred grains of the samples.

During the last quarter century the Institute has expanded and grown into a Centre of Excellence in the Himalayan Geosciences with scientists and staff working in diverse fields probing deep earth structure and rocks of the mountains, glaciers, river systems, lakes, groundwater, landslides, etc. Sophisticated analytical facilities in the Institute are run by competent scientists and technical staff, generating data for Scientists of the Institute as well as for other Universities and organisations.

In the past WIHG has technically empowered several mega and small infrastructure projects relating to hydroelectricity, tunnels, railways, road alignments, groundwater and mineral wealth surveys etc. The institute’s well-equipped state of the art laboratories and other infrastructure are sound and ready to undertake consultancy projects related to: Selection of sites for Hydroelectric projects, buildings, infrastructures, dams, bridges, rail route or any other construction related activities in the Himalayan terrain.

Selection of sites for potential source of groundwater and water quality check including quantification of pollutants. Large scale engineering geological, geomorphological and geotechnical mapping of the area, including landslide related studies and their monitoring.

optically stimulated luminescence