The origin of dose distributions in fluvial sediments, and the prospect of dating single grains from fluvial deposits using optically stimulated luminescence

1999 ◽  
Vol 30 (2) ◽  
pp. 207-217 ◽  
Author(s):  
J.M Olley ◽  
G.G Caitcheon ◽  
R.G Roberts
Keyword(s):  
Optically Stimulated Luminescence ◽  
Fluvial Sediments ◽  
Dose Distributions ◽  
Fluvial Deposits

scholarly journals Palaeoenvironmental data from fluvial deposits associated to ancient fishing weirs in the Miño river, NW Iberia

2020 ◽  
Vol 42 ◽  
pp. 53-68
Author(s):  
Jorge Sanjurjo-Sánchez ◽  
Carlos Arce-Chamorro ◽  
Víctor Barrientos ◽  
Ana Goy-Diz
Keyword(s):  
Organic Matter Content ◽  
Matter Content ◽  
Optically Stimulated Luminescence ◽  
Sedimentation Rates ◽  
Fluvial Sediments ◽  
Climate Fluctuations ◽  
Fluvial Deposits ◽  
The Past ◽  
Nw Iberia ◽  
Anthropogenic Processes

Fluvial sediments provide environmental records of the Quaternary. In some cases, fluvial deposits are caused by anthropogenic processes that cause changes in the water regime of some river stretches. This is the case of dams. It has been reported that some dams or partial damming systems existed in the past, at least from some thousands of years ago. Such dams were used for fishing purposes and are referred as fishing weirs. In a recently published work it has been demonstrated that a fluvial thick deposit was caused by a damming system in a river of NW Iberia (River Miño, Pontevedra). Optically stimulated luminescence (OSL) provided the burial age of such fluvial deposit, showing a 1300-year-old fluvial record. The sedimentation rates of the record did not match with known climate fluctuations in the area. In this work, the sedimentation phases of such record are identified, and the detrital and organic matter content is studied to assess any change occurred in the environmental and fluvial conditions during the deposition period of the record that ranges from 814±134 to 1837±11 AD.

scholarly journals Optically stimulated luminescence and isothermal thermoluminescence dating of high sensitivity and well bleached quartz from Brazilian sediments: from Late Holocene to beyond the Quaternary?

2016 ◽  
Vol 46 (suppl 1) ◽  
pp. 209-226 ◽  
Author(s):  
André Oliveira Sawakuchi ◽  
Vinicius Ribau Mendes ◽  
Fabiano do Nascimento Pupim ◽  
Thays Desiree Mineli ◽  
Ligia Maria Almeida Leite Ribeiro ◽  
...  
Keyword(s):  
Late Holocene ◽  
High Sensitivity ◽  
Equivalent Dose ◽  
Optically Stimulated Luminescence ◽  
Osl Dating ◽  
Fluvial Sediments ◽  
Dose Distributions ◽  
Age Limit ◽  
Sediment Mixture

ABSTRACT: The development of optically stimulated luminescence (OSL) dating of sediments has led to considerable advance in the geochronology of the Quaternary. OSL dating is a well established technique to determine sediment burial ages from tens of years to few hundred thousand years. Recent studies have shown that Quaternary sediments of Brazil are dominated by quartz grains with high luminescence sensitivity, allowing the determination of precise and reliable OSL burial ages. In this paper, we show examples of OSL dating of quartz aliquots and single grains from different regions in Brazil, including young coastal-eolian Late Holocene (< 100 years) to Late Pleistocene (~ 150 ka) fluvial sediments. We discuss the OSL data and ages of sediments from carbonate and terrigenous (distributary and tributary systems) fluvial depositional contexts in Brazil. Most of the studied fluvial sediments show equivalent dose distributions with low to moderate dispersion, suggesting well bleached sediments. The comparison between aliquot and single grain data suggests that high overdispersion in equivalent dose distributions of some samples is more related with sediment mixture due to bioturbation than with incomplete bleaching during transport. Well bleached fluvial sediments contrast with the poor bleached pattern usually described for fluvial sediments in the literature. A large part of the fluvial sedimentary record in Brazil is older than the age limit for quartz OSL dating using blue light stimulation. Thus, isothermal thermoluminescence (ITL) dating protocols were tested for dating of fluvial sands from the Xingu River (eastern Amazonia). The studied sample can recover reliable equivalent doses up to 1600 Gy using the ITL 310oC signal. Therefore, this signal would be suitable to extend the age limit of quartz luminescence to the whole Quaternary or beyond (> 2 Ma) in the low dose rate (0.5 - 1.0 Gy/ka) environments typical for Brazilian sediments.

scholarly journals Comparison of paired quartz OSL and feldspar post-IR IRSL dose distributions in poorly bleached fluvial sediments from South Africa

2015 ◽  
Vol 30 ◽  
pp. 233-238 ◽  
Author(s):  
D. Colarossi ◽  
G.A.T. Duller ◽  
H.M. Roberts ◽  
S. Tooth ◽  
R. Lyons
Keyword(s):  
South Africa ◽  
Fluvial Sediments ◽  
Dose Distributions

scholarly journals Investigation of quartz ESR residual signals in the last glacial and early Holocene fluvial deposits from the Lower Rhine

2021 ◽  
Author(s):  
Marcus Richter ◽  
Sumiko Tsukamoto
Keyword(s):  
Mean Value ◽  
Recovery Ratio ◽  
Fluvial Sediments ◽  
Recovery Test ◽  
Fluvial Deposits ◽  
Modern Analogue ◽  
Spin Resonance ◽  
Sensitivity Change ◽  
The Last Glacial ◽  
Lower Rhine

Abstract. In this study, we examined the residual doses of the quartz electron spin resonance (ESR) signals from eight young fluvial sediments with known luminescence ages from the lower Rhine terraces. The single aliquot regenerative (SAR) protocol was applied to obtain the residual doses for both the Aluminium (Al) and Titanium (Ti) impurity centres. We show that all of the fluvial samples carry a significant amount of residual dose with a mean value of 1350 ± 120 Gy for the Al centre, 610 ± 60 Gy for the lithium-compensated Ti centre (Ti-Li), 170 ± 20 Gy for the hydrogen-compensated Ti centre (Ti-H), and 470 ± 50 Gy for the signal originated from both the Ti-Li and Ti-H centres (termed Ti-mix). To test the accuracy of the ESR SAR protocol, a dose recovery test was conducted and this confirmed the validity of the Ti-Li and Ti-mix signal results. The Al centre shows a dose recovery ratio of 1.74 ± 0.16, probably due to a sensitivity change by the thermal treatment in the SAR procedure, whereas the Ti-H signal shows a ratio of 0.56 ± 0.17. The results of this study suggest that fluvial sediments carry a significant residual dose, and therefore the subtraction of residual dose using a modern analogue is highly recommended to obtain reliable ESR ages.

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