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Browsing Quaternary Environmental Change Group by Author "Wintle, Ann G."

Now showing items 1-20 of 38

Analysis of equivalent-dose distributions for single grains of quartz from modern deposits

Bos, A. J. J.; Wallinga, Jakob W.; Wintle, Ann G.; Ballarini, M. (2011-07-04)

Two modern coastal sands are studied through single-grain optical dating techniques. The first sample is estimated to be less than 10 y old by means of independent age control and is known to be well-bleached on the basis ...
Anomalous fading: A reply to the comment by Huntley on “Isochron measurements of naturally irradiated K-feldspar grains”

Li, Bo; Li, Sheng-Hua; Wintle, Ann G.; Zhao, Hui (2011-01)
Assessing the reproducibility and accuracy of optical dating of fluvial deposits

Rodnight, H.; Duller, Geoff A. T.; Wintle, Ann G.; Tooth, Stephen (2006-05)

Optical dating is increasingly being applied to fluvial deposits to derive rates of geomorphological and sedimentary processes. Partial bleaching of the water-transported sediment grains is a common occurrence, however, ...
Characteristics of thermally transferred optically stimulated luminescence (TT-OSL) in quartz and its potential for dating sediments

Tsukamoto, Sumiko; Duller, Geoffrey Alastair Thomas; Wintle, Ann G. (2008-08)

The temperature dependence, dose response and bleaching characteristics of the thermally transferred optically stimulated luminescence (TT-OSL) of sedimentary quartz were studied, in order to assess the potential of the ...
A chronology of hurricane landfalls at Little Sippewissett Marsh, Massachusetts, USA, using optical dating

Madsen, A. T.; Duller, Geoff A. T.; Donnelly, J. P.; Roberts, Helen M.; Wintle, Ann G. (2009-08)

Optical dating has been applied to sediments preserved in Little Sippewissett Marsh, Massachusetts, USA, which are associated with overwashing of the beach barrier during hurricane strikes on the coast. The aims were to ...
The dating and interpretation of a Mode 1 site in the Luangwa Valley, Zambia

Barham, Lawrence; Phillips, William M.; Maher, Barbara A.; Karloukovski, Vassil; Duller, Geoffrey Alastair Thomas; Jain, Mayank; Wintle, Ann G. (2011-05)

Flake based assemblages (Mode 1) comprise the earliest stone technologies known, with well-dated Oldowan sites occurring in eastern Africa between similar to 2.6-1.7 Ma, and in less securely dated contexts in central, ...
Dose dependence of thermally transferred optically stimulated luminescence signals in quartz

Kim, J. C.; Duller, Geoff A. T.; Roberts, Helen M.; Wintle, Ann G.; Lee, Y. I.; Yi, S. B. (2009-02-01)

The thermally transferred optically stimulated luminescence (TT-OSL) responses of chemically purified fine-grained quartz from seven loess-like samples from Korea are presented. In particular, the experimental procedures ...
Electron-trapping probability in natural dosemeters as a function of irradiation temperature

Botter-Jensen, L.; Wallinga, Jacob W.; Murray, A. S.; Wintle, Ann G. (2011-08-09)

The electron-trapping probability in OSL traps as a function of irradiation temperature is investigated for sedimentary quartz and feldspar. A dependency was found for both minerals; this phenomenon could give rise to ...
Equivalent dose determinations for polymineralic fine-grains using the SAR protocol: application to a Holocene sequence of the Chinese Loess Plateau

Roberts, Helen M.; Wintle, Ann G. (2001-12-01)

A single-aliquot regenerative-dose (SAR) protocol, involving stimulation of the same disc with an infra-red laser diode followed by blue LEDs, was applied to polymineralic fine-grains. Infra-red stimulated luminescence ...
Equivalent dose distributions from single grains of quartz at Sibudu, South Africa: context, causes and consequences for optical dating of archaeological deposits

Jacobs, Zenobia; Wintle, Ann G.; Roberts, Richard G.; Duller, Geoffrey A. T. (2008-07)

Optical ages for 14 sediment samples collected from the post-Howiesons Poort, late Middle Stone Age (MSA) and final MSA deposits at Sibudu, KwaZulu-Natal, South Africa were reported in a companion paper (Jacobs, Z., Wintle, ...
Extending the chronology of deposits at Blombos Cave, South Africa, back to 140 ka using optical dating ot single an multiple grains of quartz

Jacobs, Zenobia; Duller, Geoff A. T.; Henshilwood, C. S.; Wintle, Ann G. (2006-09)

Optically stimulated luminescence (OSL) measurements are reported for both single aliquots (of two different sizes) and single grains of quartz from deposits within Blombos Cave. Ages have been obtained for six sediments ...
The formation and evolution of the barrier islands of Inhaca and Bazaruto, Mozambique

Rebelo, L. P.; Wintle, Ann G.; Armitage, S. J.; Botha, G. A.; Duller, Geoff A. T.; Momade, F. J. (2006)

The barrier islands of Inhaca and Bazaruto are related to the extensive coastal dune system of the Mozambican coastal plain, south-east Africa. Optically stimulated luminescence (OSL) dating of key stratigraphic units ...
Future directions of luminescence dating of quartz

Wintle, Ann G. (2011-06-15)

Recent developments in our understanding of the limitations of optically stimulated luminescence as a dating tool are presented alongside summaries of results obtained on other luminescence signals measured in sedimentary ...
Infrared stimulated luminescence measurements of single grains of K-rich feldspar for isochron dating

Li, Bo; Li, Sheng-Hua; Duller, Geoff A. T.; Wintle, Ann G. (2011-02-01)

This paper explores the use of single grain luminescence measurements in isochron dating of K-rich feldspars. The thermal stability of individual feldspar grains was investigated using pulse annealing methods, which appears ...
Interpretation of single grain D-e distributions and calculation of D-e

Jacobs, Zenobia; Wintle, Ann G.; Duller, Geoff A. T. (2006)

Recent development of an instrument for measuring the optically stimulated luminescence signal from individual mineral grains has made it practicable to measure the equivalent dose (De) from many hundreds or thousands of ...
Investigating quartz optically stimulated luminescence dose–response curves at high doses

Lowick, Sally E.; Preusser, Frank; Wintle, Ann G. (2010-10)

Despite the general expectation that optically stimulated luminescence (OSL) growth should be described by a simple saturating exponential function, an additional high dose component is often reported in the dose response ...
Isochron measurements of naturally irradiated K-feldspar grains

Li, S. H.; Wintle, Ann G.; Li, Bo; Zhao, H. (2007-09)

The equivalent doses of K-feldspar grains in a range of grain sizes from 90 to View the MathML source diameter were measured using a single-aliquot regenerative-dose protocol for the infrared stimulated luminescence (IRSL) ...
Late-Holocene (post-4000 years BP) coastal dune development in Northumberland, northeast England

Braley, S. M.; Wintle, Ann G.; Wilson, P.; Orford, J. D.; Knight, J. (2011-07-29)

The recent environmental history of coastal dune systems in Northumberland, northeast England, has been examined using geomorphological, stratigraphical and sedimentological techniques linked to radiocarbon and infrared-stimulated ...
Luminescence characteristics of quartz from the Southern Kenyan Rift Valley: Dose estimation using LM-OSL SAR

Cheong, C. S.; Wintle, Ann G.; Choi, J. H.; Duller, Geoff A. T. (2006)

Linearly modulated (LM) optically stimulated luminescence (OSL) measurements have revealed that some sedimentary quartz samples from the Kenyan Rift Valley do not have a fast OSL component, but contain a medium component ...
The mechanism of thermally transferred optically stimulated luminescence in quartz

Wang, X. L.; Bailey, R. M.; Adamiec, G.; Wintle, Ann G. (2008-06-12)

In this paper we assess two mechanisms for the production of the thermally transferred optically stimulated luminescence (TT-OSL) signal in quartz when all stimulation is carried out at 125 °C. One mechanism is based on ...

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