Zenobia Jacobs wants to know where we came from, and how we got here. When did our distant ancestors leave Africa and spread across the world? And when was Australia first settled? Zenobia Jacobs, University of Wollongong photo credit: timothyburgess. These are difficult and controversial questions. But Zenobia has a deep understanding of time and how to measure it. She has developed a way of accurately dating when individual grains of sand were buried with human artefacts. And that technique is transforming our understanding of human evolution. She uses a dating technique known as optically stimulated luminescence OSL. It relies on subtle changes in sand grains due to the decay of tiny amounts of radioactive elements present in all natural deposits.
Optically stimulated luminescence OSL is a trapped-charge technique used to date the last exposure to sunlight of mineral grains contained in sedimentary deposits, primarily quartz and potassium feldspar Aitken, , ; Huntley et al. Violet Stimulated Luminescence VSL , first introduced by Jain , is believed to access charges from a deep trap with an extended dose-response saturation in the kGy range.
For our investigation, we selected four sediment samples of known ages, based on their varied expected equivalent doses D e , as follows Table 1 :. Sample X was collected under opaque tarps and with dim orange lighting, and all other samples were collected in light-safe tubes hammered into profile walls. All samples were opened under subdued amber light in the luminescence dating laboratory of the Research Laboratory for Archaeology and History of Art in Oxford, UK.
Sample X received an additional density separation step sodium polytungstate at a density of 2.
Luminescence dating of sediment mounds associated with shaft and gallery Single grain OSL and micromorphological techniques applied to shaft mound of Earth and Environmental Sciences, University of Wollongong, Wollongong,
Optically stimulated luminescence OSL ages can determine a wide range of geological events or processes, such as the timing of sediment deposition, the exposure duration of a rock surface, or the cooling rate of bedrock. The accuracy of OSL dating critically depends on our capability to describe the growth and decay of laboratory-regenerated luminescence signals. Here we review a selection of common models describing the response of infrared stimulated luminescence IRSL of feldspar to constant radiation and temperature as administered in the laboratory.
We use this opportunity to introduce a general-order kinetic model that successfully captures the behaviour of different materials and experimental conditions with a minimum of model parameters, and thus appears suitable for future application and validation in natural environments. C Elsevier Ltd. All rights reserved.
Til studerende Til ph. Lokal ph. Lokal medarbejderportal Institut for Geoscience. Institut for Geoscience. Hvorfor studere Geoscience? Institut for Geoscience – Nordisk Laboratorium for Luminescensdatering.
Kimberley rock art dating project
Single-grain optically stimulated luminescence OSL dating of terminal Pleistocene and early Holocene human occupation sites in the Dhofar region of Oman. Lauren Patricia Linnenlucke , University of Wollongong. The Arabian Peninsula is situated within a crossing zone for the movement of pastoralist communities. Current interest regarding the development from hunter-gather to pastoralists is due to the discovery of the Nejd Leptolithic Tradition located within western Oman.
The use of Nejd Leptolithic assemblages as an archaeological marker is considered important, as they are only found within Southern Arabia and are considered a defining point in determining when humans transformed into a more prominent pastoralist society. By examining three Nejd Leptolithic rock shelters within western Oman Ghazal, Khumseen and Al-hatab and providing accurate age estimates using pseudo single-grain optically stimulated luminescence OSL dating to determine the age of the sediments, we were able to provide ages for all three sites.
and Environmental Science, University of Wollongong, Wollongong, NSW , There is no distinctive difference in the shape of OSL decay curves among Single-grain optically stimulated luminescence (OSL) dating of.
Downey, University of Botswana, Botswana Miss. Asia Dr. Zhao Hui, Environmental and Eng. Huaya Lu, Inst. Tang Hongbin, Inst. Wang Weida. Research Lab. Environmental Bureau, Shizuan , China Prof. Lufang, Unit for Appr. Relics of Guangdong, Guangzhou, China Dr.
How did we get here?
Portable Spectrofluorimeter for non-invasive analysis of cultural heritage artworks using LED sources. Luminescence spectroscopy – Spatially resolved luminescence – Time resolved luminescence – Electron spin resonance ESR. Flint and heated rocks – Ceramics and pottery – Unheated rock surfaces – Tooth enamel and quartz grains – Sediment dating.
Skip to main content. Create new account Request new password. Secondary menu Home. CaseViews CaseHeader. The goal of this analysis is develop a chronology for the site that can be extended into the lower anthropogenic levels, beyond the limits of radiocarbon dating. Dating of recently excavated stratigraphic units is essential to ongoing interpretation of stratigraphy and human behavior, and particularly for timing the shift in technology from the late Middle to Early Later Stone Age.
Dating sites, paintings and evidence for early humans
We demonstrate the large variation in OSL behaviors for individual quartz grains of different samples from different regions, and show that recuperation, sensitivity change, and reproducibility are independent of the brightness and decay curve shape of the OSL signals.
written by Henry Munack, University of Wollongong –. In geomorphology, radiometric dating methods have been on the rise during the past.
Eligible to supervise Masters and PhD – email supervisor to discuss availability. His research focuses on reconstructing archaeological, palaeoecological and palaeoenvironmental histories using luminescence dating techniques, with a particular emphasis on single-grain optically stimulated OSL dating applications and advancements. He has worked extensively at archaeological and palaeontological sites across Europe, North America, Africa, Australia and Russia.
Application of optically stimulated luminescence OSL , thermally transferred OSL TT-OSL , post-infrared infrared stimulated luminescence pIR-IRSL and thermoluminescence TL dating techniques in the Quaternary and archaeological sciences, including studies of human evolution and dispersal, palaeoenvironmental reconstruction, palaeoclimatology, landscape evolution and geomorphology.
Methodological developments and analytical improvements in luminescence dating techniques, with a particular focus on:. Megafaunal evolution and extinction dynamics across Australia, Beringia, and the Eastern Mediterranean. The timing of human dispersal in Eurasia, the initial occupation of the circum-Mediterranean, Lower and Middle Palaeolithic archaeology of the Iberian Peninsula and Southern Europe.
Geomorphology, landscape evolution and palaeoenvironmental reconstructions of Australian drylands through the Quaternary Period. Early African woodworking and tool use at the transition to modern humans. A Herries, L. Arnold , M. Meredith-Williams; M.
OCTOPUS: An Open Cosmogenic Isotope and Luminescence Database
Quartz has been the main mineral used for optically stimulated luminescence OSL dating of sediments over the last decade. The application of IRSL dating of feldspars, however, has long been hampered by the anomalous fading effect. These procedures have raised the prospect of isolating a non-fading IRSL component for dating Quaternary deposits containing feldspars.
University of Wollongong, Wollongong, Australia; 3Soil Geography and Landscape group & Netherlands Centre for Luminescence dating.
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