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

Now showing items 1-20 of 24

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 ...
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 ...
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 ...
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

Adamiec, G.; Bailey, R. M.; Wang, X. L.; 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 ...
A modified SAR protocol for optical dating of individual grains from young quartz samples

Ballarini, M.; Wallinga, Jakob W.; Wintle, Ann G.; Bos, A. J. J. (2007-03)

We investigate the feasibility of a modified single-aliquot regenerative-dose (SAR) protocol for OSL dating of individual grains from young samples (
New ages for the post-Howiesons Poort, late and final Middle Stone Age at Sibudu, South Africa

Jacobs, Zenobia; Wintle, Ann G.; Duller, Geoffrey A. T.; Roberts, Richard G.; Wadley, Lyn (2008-07-01)

Optically stimulated luminescence (OSL) measurements are reported for single grains of quartz from deposits within Sibudu rock shelter. Such measurements enable rejection of unrepresentative grains and application of the ...
A new OSL chronology for dust accumulation in the last 130,000 yr for the Chinese Loess Plateau

Lu, Y. C.; Wang, X. L.; Wintle, Ann G. (2007-01)

A sensitivity-corrected Multiple Aliquot Regenerative-dose protocol has been developed for fine-grained quartz OSL dating of Chinese loess. Its reliability has been assessed on the basis of the methodology and by dating ...
Optical dating of dune sand from Blombos Cave, South Africa: I - multiple grain data

Duller, Geoff A. T.; Wintle, Ann G.; Jacobs, Zenobia (2003-05)

An aeolian sand unit overlies the Middle Stone Age deposits at Blombos Cave on the southern Cape coast. These deposits contained culturally-important artefacts, including bone tools and pieces of engraved ochre, as well ...
Overcoming environmental dose rate changes in luminescence dating of waterlain deposits

Li, B.; Li, S. H.; Wintle, Ann G. (Versita Publications, 2008-03-28)

This study investigates lacustrine and fluvial sediments on the Sala Us River in the Mu Us Desert in central north China. Significant changes in environmental dose rate in part of the section could be shown to have occurred ...
Rates of dust deposition between 50 ka and 20 ka revealed by OSL dating at Yuanbao on the Chinese Loess Plateau

Lai, ZhongPing; Wintle, Ann G.; Thomas, D. S. G. (2007-05)

A new chronology has been constructed for an 18-m section of Malan Loess at Yuanbao, near Linxia, on the western edge of the Chinese Loess Plateau. The chronology has been obtained using the optically stimulated luminescence ...

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