Multi-method luminescence dating of old fluvial sediments from northern Tian Shan, China

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Kechang Li ◽  
Jintang Qin ◽  
Jie Chen ◽  
Jun Shen ◽  
Sheng-Hua Li
Keyword(s):  
Test Dose ◽  
Northwest China ◽  
Luminescence Dating ◽  
Early Pleistocene ◽  
Sand Sample ◽  
Minimum Age ◽  
Age Model ◽  
Single Grain ◽  
Shortening Rate ◽  
Tian Shan

AbstractAt the eastern tip of Anjihai anticline on the northern piedmont of Tian Shan (northwest China), deformed fluvial deposits have recorded active folding since the Pleistocene, but the absence of accurate ages makes it difficult to evaluate the anticline’s shortening rate. Geological studies ascribed the fluvial strata to the early Pleistocene, which poses potential challenges for luminescence dating. In this study, multi-methods luminescence dating was applied to a fluvial sand sample taken from the sandy bed of the deformed basal strata. Single grain post-Infrared Infrared Stimulated Luminescence (pIRIR) and multiple-aliquot-regenerative (MAR) dose along with multiple-elevated-temperature pIRIR (MET-pIRIR) procedures were applied to determine the paleodose of the sample. The methodological uncertainties, such as thermal transfer and initial sensitivity change, were treated by increasing the test dose and performing dose recovery test. With consideration of the potential partial bleaching and anomalous fading, various statistical metrics were applied to the De values determined by using the single grain pIRIR225, single grain pIRIR290 and MAR-MET-pIRIR290 signals. The minimum age model (MAM) De values are 11% – 17% lower than the central age model (CAM) De values in general, and the MAM De values determined by the single grain pIRIR procedures are underestimated by more than 40% when compared with those determined by MAR-MET-pIRIR290 procedure. The MAM MAR-MET-pIRIR290 De of 811 ± 44 Gy results in a burial age of 284 ka for the basal deformed fluvial strata, which is much younger than the proposed early Pleistocene age.

scholarly journals Chronology of Cauvery Delta Sediments from Shallow Subsurface Cores Using Elevated-Temperature Post-IR IRSL Dating of Feldspar

2010 ◽  
Vol 37 (-1) ◽  
pp. 37-47 ◽  
Author(s):  
L. Alappat ◽  
S. Tsukamoto ◽  
P. Singh ◽  
D. Srikanth ◽  
R. Ramesh ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Luminescence Dating ◽  
Natural Quartz ◽  
Shallow Subsurface ◽  
Dose Rates ◽  
Icp Ms ◽  
Minimum Age ◽  
Age Model ◽  
Cauvery Delta ◽  
Delta Sediments

Chronology of Cauvery Delta Sediments from Shallow Subsurface Cores Using Elevated-Temperature Post-IR IRSL Dating of Feldspar We present the results of luminescence dating of sediments from two cores from the Cauvery Delta in south-east India. Since all natural quartz OSL signals except one sample were in saturation, the elevated temperature post-IR IRSL protocol for K-feldspar was applied to establish a chronology. Internal dose rates of K-feldspar grains were calculated from the measured internal content of potassium, uranium, thorium and rubidium in the bulk of K-feldspar grains using solution ICP-OES and ICP-MS analysis. A substantial scatter in single-aliquot De values was observed which is most probably due to the effect of incomplete bleaching of fluvial sediments before burial. A minimum age model was applied to extract possible depositional ages. The study revealed that except an upper layer of Holocene sediments (< 5m), the majority of the upper ~50m of Cauvery delta sediments were deposited between marine isotope stage MIS-5 and MIS-10 or older. The feldspar luminescence ages also indicate the existence of a period of non deposition or erosion in the upper part of the cores.

scholarly journals Extended range luminescence dating of quartz and alkali-feldspar from aeolian sediments in the eastern Mediterranean

2020 ◽  
Author(s):  
Galina Faershtein ◽  
Naomi Porat ◽  
Ari Matmon
Keyword(s):  
Eastern Mediterranean ◽  
Alkali Feldspar ◽  
Luminescence Dating ◽  
Early Pleistocene ◽  
Middle Pleistocene ◽  
Infrared Stimulated Luminescence ◽  
Aeolian Sediments ◽  
Extended Range ◽  
Recent Developments ◽  
Minimum Age

Abstract. Optically stimulated luminescence (OSL) on quartz is an established technique for dating late Pleistocene to late Holocene sediments. Unfortunately, this method is often limited to up to 100 ka (thousands of years). Recent developments in new extended range luminescence techniques show great potential for dating older sediments of middle and even early Pleistocene age. These methods include thermally transferred OSL (TT-OSL) and violet stimulated luminescence (VSL) for quartz and post infrared-infrared stimulated luminescence (pIRIR) for feldspar. Here we investigate the luminescence behavior of the TT-OSL, VSL and pIRIR signals of quartz and feldspar minerals of aeolian sediments of Nilotic origin from the eastern Mediterranean. We sampled a 15 m thick sequence (Kerem Shalom) comprising sandy calcic paleosols, which is part of a sand sheet that covers an extensive region in south-western Israel. Dose recovery and bleaching experiments under natural conditions indicated that the pIRIR250 signal is the most suitable for dating the Nilotic feldspar. Luminescence intensity profiles revealed natural saturation of the three signals at the same depth of ~6 m, indicating that ages of samples below that depth are minimum ages. Using TT-OSL and pIRIR250, a minimum age of 715 ka, for the base of the section was obtained, suggesting aeolian sand accumulation along the eastern Mediterranean coastal plain already since the early Pleistocene. Our results indicate that both TT-OSL and pIRIR250 can accurately date middle Pleistocene aeolian sediments of Nilotic origin and that minimum ages can be provided for early Pleistocene samples.

scholarly journals Methodological Aspects on Luminescence Dating of Fluvial Sands from the Moselle Basin, Luxembourg

2010 ◽  
Vol 35 (-1) ◽  
pp. 67-74 ◽  
Author(s):  
S. Cordier ◽  
M. Frechen ◽  
S. Tsukamoto
Keyword(s):  
Western Europe ◽  
Luminescence Dating ◽  
Dose Determination ◽  
Infrared Stimulated Luminescence ◽  
Lower Terrace ◽  
Minimum Age ◽  
Age Model ◽  
Methodological Aspects ◽  
Selection Of ◽  
Good Agreement

Methodological Aspects on Luminescence Dating of Fluvial Sands from the Moselle Basin, LuxembourgOptically stimulated luminescence (OSL) dating of quartz and infrared-stimulated luminescence (IRSL) dating of feldspar were applied to fluvial sands from the lower terrace (M1) of the Moselle valley in Luxembourg (western Europe). The dating results indicated that the aggradation period for the sediments from below the M1 alluvial terrace can be correlated to the Weichselian upper Pleniglacial (MIS 2), which is in good agreement with the general chronostratigraphy of the Moselle terrace staircase. The ages were obtained from small aliquots of quartz and feldspars, using the single aliquot regenerative (SAR) protocol. The equivalent dose determination included a series of tests and the selection of the Minimum Age Model as the most appropriate statistical model. This made it possible to provide a reliable methodological background for further luminescence dating of fluvial sediments from the Moselle basin.

scholarly journals Extended-range luminescence dating of quartz and alkali feldspar from aeolian sediments in the eastern Mediterranean

Geochronology ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 101-118 ◽  
Author(s):  
Galina Faershtein ◽  
Naomi Porat ◽  
Ari Matmon
Keyword(s):  
Eastern Mediterranean ◽  
Alkali Feldspar ◽  
Luminescence Dating ◽  
Early Pleistocene ◽  
Infrared Stimulated Luminescence ◽  
Aeolian Sediments ◽  
Extended Range ◽  
Recent Developments ◽  
Minimum Age ◽  
Sand Sheet

Abstract. Optically stimulated luminescence (OSL) of quartz is an established technique for dating late Pleistocene to late Holocene sediments. Unfortunately, this method is often limited to up to 100 ka (thousands of years). Recent developments in new extended-range luminescence techniques show great potential for dating older sediments of middle and even early Pleistocene age. These methods include thermally transferred OSL (TT-OSL) and violet stimulated luminescence (VSL) for quartz and post-infrared infrared stimulated luminescence (pIRIR) for feldspar. Here we investigate the luminescence behaviour of the TT-OSL, VSL, and pIRIR signals of quartz and feldspar minerals of aeolian sediments of Nilotic origin from the eastern Mediterranean. We sampled a 15 m thick sequence (Kerem Shalom) comprising sandy calcic palaeosols, which is part of a sand sheet that covers an extensive region in south-western Israel. Dose recovery and bleaching experiments under natural conditions indicated that the pIRIR250 signal is the most suitable for dating the Nilotic feldspar. Luminescence intensity profiles revealed natural saturation of the three signals at the same depth of ∼6 m, indicating that ages of samples below that depth are minimum ages. Using TT-OSL and pIRIR250, a minimum age of 715 ka for the base of the section was obtained, suggesting aeolian sand accumulation along the eastern Mediterranean coastal plain already since the early Pleistocene. Our results indicate that both TT-OSL and pIRIR250 can accurately date aeolian sediments of Nilotic origin up to 200 ka and that minimum ages can be provided for older samples up to the early Pleistocene.

scholarly journals Methodological study on single grain OSL dating of mortars: Comparison of five reference archaeological sites

2017 ◽  
Vol 44 (1) ◽  
pp. 77-97 ◽  
Author(s):  
Petra Urbanová ◽  
Pierre Guibert
Keyword(s):  
Input Parameter ◽  
Osl Dating ◽  
Archaeological Sites ◽  
Annual Dose ◽  
Dose Distributions ◽  
Minimum Age ◽  
Age Model ◽  
Single Grain ◽  
External Consistency ◽  
The Impact

Abstract The paper focuses on single grain OSL dating of quartz extracted from known age archaeological mortars, potentially representing a new tool for dating the construction of historical buildings. Apart from SG-OSL measurements and annual dose rate determination, the samples are systematically studied by means of optical microscopy, EDX-SEM cartography and beta autoradiography in order to evaluate the possible microdosimetric heterogeneity of each sample, arising principally from local variations of potassium content. Besides the practical aspects concerning sampling, preparation and appropriate choice of measurement conditions, the paper aims at the differences in microstructure and in elementary composition between different mortars and attempts to evaluate the impact of these aspects on the dispersion of equivalent dose distributions. Finally, archaeological doses (paleodoses) are calculated by using central age model (CAM), minimum age model (MAM) and internal-external consistency criterion (IEU). The appropriateness of these models for the exploitation of the measured SG-OSL data as well as for a hypothesis on the estimation of the input parameter needed to run these models are discussed. Three categories of mortars were identified: samples without any exploitable SG-OSL signal, samples that could have been reliably dated and poorly bleached samples affected by microdosimetric variations whose dating still remains complicated. Finally, the hypothesis on distinguishing between reliable and questionable dating results is raised and the potentials of the method for dating mortars are pointed out.

scholarly journals Quartz Single Grain Osl Sensitivity Distributions: Implications for Multiple Grain Single Aliquot Dating

2007 ◽  
Vol 26 (-1) ◽  
pp. 19-29 ◽  
Author(s):  
Edward Rhodes
Keyword(s):  
Numerical Model ◽  
National Park ◽  
Australian Capital Territory ◽  
Sensitivity Distribution ◽  
Minimum Age ◽  
Age Model ◽  
Single Grain ◽  
Simpson Desert ◽  
Simple Numerical Model ◽  
Real Multiple

Quartz Single Grain Osl Sensitivity Distributions: Implications for Multiple Grain Single Aliquot DatingA simple probabilistic numerical model was used to construct synthetic Dedistributions by combining the simulated OSL from grains of different sensitivities and with various simulated Devalues. This is useful for exploring the complex patterns generated by summing the signals from many grains in real, multiple grain OSL dating scenarios, and demonstrates that the form of the sensitivity distribution has a significant effect on the identification of mixed dose populations in multiple grain single aliquot methods. I describe the simple numerical model and its implementation. I present measured quartz single grain OSL sensitivity distributions for an aeolian dune sample from the Simpson Desert, Northern Territory, Australia, and from a suite of 9 fluvial sediments from Namadgi National Park, Australian Capital Territory, Australia, to illustrate effects that result from natural differences. Minimum age model determinations of synthetic Devalues are used to assess the validity of dose values estimated from multiple grain single aliquot measurements.

scholarly journals Local inundation distances and regional tsunami recurrence in the Indian Ocean inferred from luminescence dating of sandy deposits in Thailand

2012 ◽  
Vol 12 (7) ◽  
pp. 2177-2192 ◽  
Author(s):  
D. Brill ◽  
N. Klasen ◽  
K. Jankaew ◽  
H. Brückner ◽  
D. Kelletat ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Luminescence Dating ◽  
Indian Ocean Tsunami ◽  
Minimum Age ◽  
Age Model ◽  
The Indian Ocean ◽  
Tsunami Recurrence ◽  
Quartz Grains ◽  
Sand Sheets ◽  
Partial Bleaching

Abstract. The Holocene beach-ridge plain of Phra Thong Island (Ko Phra Thong, SW Thailand) provides sedimentary evidence of several palaeotsunamis, in addition to the deposit of the 2004 Indian Ocean tsunami. Due to poor preservation conditions, these palaeoevent layers are restricted to swales. Correlation across beach ridges, which is important e.g. to reconstruct inundation distances, remains a major challenge. A primary tool for establishing a precisely confined correlation of the sand sheets is the use of chronological data. Since the application of radiocarbon dating is limited by the scarcity of appropriate material, this study utilised optically stimulated luminescence (OSL) dating of tsunamigenic quartz grains. Generally, the sediments showed favourable luminescence properties regarding signal intensity, dose recovery and thermal stability. Disturbances of the OSL signal due to partial bleaching were corrected using the minimum age model. At least three palaeoevents – being 490–550, 925–1035 and 1740–2000 yr old – were distinguished by dating the discontinuous sand sheets at four different sites. Besides this chronological framework, the OSL data provide the opportunity to correlate the discontinuous sand sheets between spatially separated sites within the same swale as well as across ridges. This allows for first estimates of inundation distances for the palaeotsunamis documented on Phra Thong Island. Furthermore, the two younger events overlap in age with contemporaneous tsunami and earthquake evidence from other coasts bordering the Indian Ocean.

Luminescence and Radiocarbon Dating of Mortars at Milano-Bicocca Laboratories

Radiocarbon ◽  
2020 ◽  
Vol 62 (3) ◽  
pp. 657-666 ◽  
Author(s):  
Laura Panzeri ◽  
Francesco Maspero ◽  
Anna Galli ◽  
Emanuela Sibilia ◽  
Marco Martini
Keyword(s):  
Statistical Approach ◽  
Optically Stimulated Luminescence ◽  
Raw Material ◽  
Historical Structures ◽  
Minimum Age ◽  
Age Model ◽  
Single Grain ◽  
Sample Age ◽  
Quartz Grains ◽  
Selection Of

ABSTRACTThis work shows the results of optically stimulated luminescence (OSL) and radiocarbon (14C) dating applied to mortars of historical structures in northern Italy. All the results are compared with archaeological evidence and thermoluminescence (TL) dating of bricks. The main issue for OSL mortar dating is that the quartz grains contained in the mortar may be only partially bleached, leading to an overestimation of the sample age. In order to identify the best protocol to apply, both multi-grain (MG) and single grain (SG) methods were used. The minimum age model (MAM) statistical approach was applied to refine their accuracy. However, the identification of the bleached grains is not always successful, indicating that further investigations are needed to develop suitable dating protocol. For the 14C technique, a crucial aspect is the selection of anthropogenic calcite. In this work the mortars were treated using a Cryosonic method to select anthropogenic calcite from raw material, and the obtained powder was sieved to select the finer fraction. Unfortunately, only in two cases an acceptable amount of sample could be obtained. All the fractions were dated via accelerator mass spectrometry (AMS), and the results compared with independently obtained dates. The results show that the execution of the dating analysis requires previous characterizations to assess the nature of the mortar components and avoid unusable fractions.

scholarly journals Intraspecific divergences and phylogeography of Panzerina lanata (Lamiaceae) in Northwest China

2018 ◽  
Author(s):  
Yanfen Zhao ◽  
Hongxiang Zhang ◽  
Borong Pan ◽  
Mingli Zhang
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Population Genetic ◽  
Divergence Time ◽  
Northwest China ◽  
Northwestern China ◽  
Intraspecific Diversity ◽  
Early Pleistocene ◽  
Helan Mountains ◽  
The Impact

Climactic fluctuations during the Quaternary played a crucial role in genetic diversity and population genetic structure of many plant species in northwestern China. In order to understand the impact of climate change on herbaceous plants, we studied Panzerina lanata (Lamiaceae), a widely distributed species. Two chloroplast DNA intergenic spacers (trnH-psbA and rpoB-trnC) were used to sequence 269 individuals from 27 populations and seven haplotypes were identified. Genetic structure and demographic characteristics were estimated using AMOVA, neutrality tests, and mismatch distribution analyses. The divergence times between the seven haplotypes were estimated using Beast. Our results revealed high levels of total genetic diversity (HT = 0.673±0.0869) and low levels of average within-population genetic diversity (HS = 0.033±0.0214). The analysis of molecular variance indicated major genetic differentiation among the three groups: northern, central, and eastern group. The species distribution modeling and demographic analysis indicated that P. lanata has not experience a recent range expansion. The divergence time within P. lanata occurred between the early Pleistocene and the late Pleistocene, which coincides with aridification and the expansion of the deserts in northwestern China that resulted in species diversification and habitat fragmentation. In addition, we speculate that the deserts and the Helan Mountains acted as effective geographic barriers that led to intraspecific diversity.

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