منزل osl quartz from feldspars

osl quartz from feldspars


  • A SIMPLE METHOD TO SEPARATE QUARTZ AND FELDSPAR …

    source, quartz shows luminescence emission during OSL and TL measurements, however, very weakly under IRSL stimulation; feldspars show emission under all three kinds of stimulation. The thermoluminescence signal may be assigned to quartz or feldspars because those minerals differ in temperatures at which emission occurs. The


  • Application of pulsed OSL to the separation of the ...

    It is known that the pulsed optically stimulated luminescence (OSL) characteristics of quartz and feldspars are very different. These differences can be used to preferentially discriminate against the feldspar signal in mixed quartzfeldspar mineral assemblages, or in separated quartz contaminated with a feldspar signal.


  • Thermal assistance in TA – OSL signals of feldspar and ...

    Nevertheless, TA – OSL stimulation at low, ambient temperatures provide strong hints towards the contribution of K – feldspars to this signal. Proper selection of the stimulation temperature could possibly discriminate the TA – OSL signal originating from quartz and feldspars.


  • Feldspar - Sandatlas

    Trondhjemite is a granitoid (tonalite) that contains lots of plagioclase and quartz and the only mafic mineral is biotite. Hordaland, Norway. Width of sample 10 cm. Larvikite (monzonite) is an interesting rock not only because of iridescent colors, but also because it contains all three feldspars (K-feldspar, albite, plagioclase). Larvik, Norway.


  • Time-Resolved OSL Experiments | SpringerLink

    We show how to analyze TR-OSL signals from delocalized transitions and also TR-IRSL signals involving localized transitions in feldspars involving quantum tunneling. This chapter concludes with the presentation of a TR-photoluminescence (TR-PL) …


  • EFFECTS OF FELDSPAR CONTAMINATION ON EQUIVALENT …

    OSL ages of multi-minerals underestimate the age of pure quartz OSL (samples from both Urumqi in Xinjiang Province in the west of China and Zhenjiang section in the Yangtze delta, Jiangsu Province in the east coast of China). The main purpose of the study is to examine the effects of feldspar contamination on OSL of quartz for Chinese loess.



  • ADVANTAGES AND DISADVANTAGES IN THE UTILISATION OF ...

    In the study of OSL of quartz and mixed feldspars from sediments, Godfrey-Smith [11] found linear dependence on the dose of the unheated samples. However, following a preheat at 225oC, the samples showed a clear superlinearity of the OSL signal at low excitation doses of γ irradiation. Roberts et al. [12] have also found superlinear dose ...


  • Modeling Light Exposure of Quartz Grains During Mortar ...

    In fact, quartz is one of the most optically sensitive species used in OSL dating, in comparison with other sedimentary minerals, like feldspars. For instance, it takes 10 s of full sunlight to reduce the initial level of OSL by a factor of 100 (Godfrey-Smith et al. Reference Godfrey-Smith, Huntley and Chen 1988 ).


  • Revisiting TL: Dose measurement beyond the OSL range …

    Isothermal TL, Red emission, Quartz, Feldspars, Fading, Indo-Gangetic plains Introduction Over the last decade optically stimulated luminescence (OSL) dating of quartz has been established as a robust sediment dating method (Murray and Olley, 2002). This method relies on measurement of …


  • Study of sensitivity change of OSL signals from quartz and ...

    T1 - Study of sensitivity change of OSL signals from quartz and feldspars as a function of preheat temperature. AU - Jungner, H. AU - Bøtter-Jensen, L. PY - 1994. Y1 - 1994. N2 - Optically stimulated luminescence (OSL) signals from feldspar and quartz samples were studied using infrared (860 nm) and green light (420-575 nm) stimulation.


  • JMSE | Free Full-Text | Standardized Dose–Response Curve ...

    Since the quartz OSL signal is bleached faster than the K-feldspar pIRIR signal [37,38,39], the age consistency indicates that the quartz OSL signal for the Bohai coastal sediments was generally well bleached [9,25]. The outcome of both the component analysis and age comparison implies that the OSL signal of quartz from Bohai Coast has been ...


  • Minimizing feldspar OSL contamination in quartz UV-OSL ...

    (iv) Feldspars suffer from anomalous (athermal) fading. For all these reasons, it is usually necessary to separate quartz and feldspar OSL signals to obtain useful quartz dose estimates. The standard approach to this is by physical/chemical separation in the laboratory using well-established chemical procedures (Wintle, 1997). However, in some ...


  • GChron - Extended-range luminescence dating of quartz and ...

    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.


  • Application of different protocols and age-models in OSL ...

    Each grain was stimulated and 95 wt%, mainly composed of quartz grains (30– for 1 s at 125°C. 40%), metamorphic rock fragments (mica schist and The OSL signal of multi-grain aliquots was obtained quartz-rich rocks, 5–30%), feldspars (5–10%), phyllosili- integrating the first 0.64 s and subtracting the background cates (5–15% ...


  • (PDF) Minimizing feldspar OSL contamination in quartz UV ...

    Minerals such as quartz Laboratory for Luminescence Dating identifies about 10% of and feldspars are commonly used in luminescence based ret- all quartz samples as significantly contaminated (in terms of rospective dosimetry techniques because of their abundance in OSL signals) by feldspar (out of an annual throughput of ∼800 the natural ...


  • IRSL dating of K-feldspars: Modelling natural dose ...

    Results show that incorporating trap competition into the model reduces the agreement between feldspar IRSL ages and quartz OSL ages. AB - We recently proposed a model that reconstructs the natural dose response curve for K-rich feldspars, using laboratory fading measurements and dose response as …


  • Luminescence characteristics and dose distributions for ...

    Mumba rockshelter is a key archaeological site for the Middle and Later Stone Age occupation of East Africa, but its chronology has remained unresolved. We report the results of a dating study, focussing on the characterisation of the optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL) properties of quartz- and potassium-rich feldspar grains. Quartz has ...


  • What are the differences between feldspar and quartz ...

    Quartz comes in different colors including white, smoky yellow, rose, violet, yellow, opaque and brown. Unlike quartz, feldspar grains are seen to be dirty due to alteration. Feldspar is a mineral that is less resistant and stable than quartz.


  • Basic procedures of optically stimulated luminescence (OSL ...

    Lai Z P, Zoller L, Fuchs M, et al. 2008c. Alpha efficiency determination for OSL of quartz extracted from Chinese loess. Radiation Measurements, 43(2-6): 767-770. Lai Z P. 2010. Chronology and the upper dating limit for loess samples from Luochuan section in the Chinese Loess Plateau using quartz OSL …


  • OSL, TL and IRSL emission spectra of sedimentary quartz ...

    In the present study, quartz and feldspar spectra will be analysed using stimulation by heat (TL-spectra), green light (OSL-spectra) and infrared light (IRSL-spectra). A special focus is set on measurements at elevated OSL and IRSL stimulation temperatures. On the one hand, this will test the capability of the newly developed Lexsyg system to ...


  • Experimental and modelling study of time-resolved ...

    in the pulsed-OSL signals from quartz and feldspars when dealing with either mixed quartzfeldspar mineral samples or in the case of quartz contaminated with feldspars. These authors suggested a technique of gating the counting period, to significantly reduce the feldspar signal relative to the signal from quartz.



  • Exploring IRSL50 fading variability in bedrock feldspars ...

    T D ACCEPTED MANUSCRIPT 1 1 Exploring IRSL 50 fading variability in bedrock feldspars and implications 2 for OSL thermochronometry 3 4 Pierre G. Valla 1,2*, Sally E. Lowick 3, Frédéric Herman 1, Jean-Daniel Champagnac 2,4, Philippe 5 Steer 5 and Benny Guralnik 2,6 6 1 Institute of Earth Surface Dynamics, University of Lausanne, 1015 Lausanne, Switzerland



  • Comparison of paired quartz OSL and feldspar post-IR IRSL ...

    Feldspars have been suggested as a dosimeter that can be used to extend luminescence dating beyond the range covered by quartz OSL (e.g. Buylaert et al., 2012). The post-infrared infrared stimulated luminescence (post-IR IRSL) protocol was proposed by Thomsen et al. (2008) to minimise the impact of anomalous fading.


  • Luminescence dating of Romanian loess using feldspars

    This work investigates the potential of optically and infrared stimulated luminescence signals (OSL and IRSL, respectively) from polymineral silt-sized grains to establish sedimentation chronologies for Romanian loess. The incentive for the study was the observation that various grain sizes of quartz yielded significantly different OSL ages, a behaviour that remains to be understood; feldspar ...


  • Isolation of Quartz Grains for Optically Stimulated ...

    However, the accuracy of OSL dating is compromised if the quartz extract is impure, particularly if contaminated by potassium and other feldspars, which can have luminescence emissions ten to hundred-fold brighter than quartz and can yield age underestimates 13. Therefore, the absolute (>99%) purity for extracts of quartz grains from sediment ...


  • The Identification of Granitic Fire-Cracked Rocks Using ...

    aliquots of quartz and feldspar (Mejdahl and Botter-Jensen 1994). In this study, the lumines-cence (TL and OSL) methods are applied to alkali feldspars coarse grains. The present study shows that both TL and OSL are reliable methods to detect the presence of FCR in an archaeological site and that OSL …


  • Luminescence dating - Wikipedia

    Single Quartz OSL ages can be determined typically from 100 to 350,000 years BP, and can be reliable when suitable methods are used and proper checks are done. Feldspar IRSL techniques have the potential to extend the datable range out to a million years as feldspars typically have significantly higher dose saturation levels than quartz, though ...