Development And Application Of Optical Dating Using Quartz And Potassium Feldspar From Quaternary Sediments

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Development and Application of Optical Dating Using Quartz and Potassium-Feldspar from Quaternary Sediments

Author : Bo Li, (Wr
Publisher : Open Dissertation Press
ISBN 13 : 9781361438695
Total Pages : pages
Book Rating : 4.4/5 (386 download)

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Book Synopsis Development and Application of Optical Dating Using Quartz and Potassium-Feldspar from Quaternary Sediments by : Bo Li, (Wr

Download or read book Development and Application of Optical Dating Using Quartz and Potassium-Feldspar from Quaternary Sediments written by Bo Li, (Wr and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Development and Application of Optical Dating Using Quartz and Potassium-feldspar From Quaternary Sediments" by Bo, Li, 李波, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled DEVELOPMENT AND APPLICATION OF OPTICAL DATING USING QUARTZ AND POTASSIUM-FELDSPAR FROM QUATERNARY SEDIMENTS Submitted by Bo Li for the Degree of Doctor of Philosophy at The University of Hong Kong in November 2007 New methods were presented for the dating of Quaternary sediments using luminescence signals from quartz and potassium-feldspar (K-feldspar) grains. These are based on fundamental studies carried out on separated quartz and feldspar grains. Estimation of the equivalent dose using the fast component and the medium component of optically stimulated luminescence (OSL) from quartz grains was investigated using both linear-modulated OSL (LM-OSL) and continuous-wave OSL (CW-OSL) techniques. By mathematical fitting of the LM-OSL curves, the fast component of the quartz OSL signal can be separated from the signals observed for mixed mineral grains in order to determine the equivalent dose (D ). The medium component underestimates the D for old samples, and this is attributed to its thermal e instability. A method was proposed to evaluate the D values for the fast component and medium component by analyzing the D as a function of stimulation time. Three kinds of source traps (i.e. shallow, medium and deep sources) for thermal transfer in quartz were identified. The shallow source is thermally unstable below 260C and is mainly related to the main OSL trap. The medium source is the primary charge source (peak 300C). The deep source is dominant at higher temperatures. Two kinds of OSL traps were identified as accepting the charges from the medium and deep sources. These OSL traps have different thermal stabilities and associated sensitization processes from those of the main OSL traps. A method was proposed to correct for thermal transfer effects for young samples based on the linear relationship between the initial and final parts of the thermally transferred OSL signals in repeated heat/OSL measurement cycles. A new isochron method involving measurement of the IRSL signals from K-feldspar grains of different size was proposed. It is based on the observation that the IRSL signal due to the internal dose does not appear to fade. The consistency between the isochron ages and quartz ages for 12 sediment samples from different geological settings suggests that the isochron method can be used to overcome anomalous fading. It can also be used to avoid problematic effects from changes in environmental dose rate. It was successfully applied to a lacustrine section showing significant changes in environmental dose rate due to a recent uptake of radioisotopes. The validity of the method was also tested using single grain IRSL measurements on K-feldspar grains. Optical dating using quartz was applied to the Holocene lacustrine and fluvial sediments at the Dagouwan section in the Sala Us River bank, Mu Us Desert. The results indicate that the Holocene Optimum occurred between 8.3 and 5.0 ka ago. After 5.0 ka ago, the Holocene Optimum terminated and the climate became dry again. The Sala Us River began to cut through the underlying Quaternary sediments after 2 ka ago with a down-cutting rate of 3-4 cm/year. The drainage of the Sala Us River accelerated the disappearance of the lake water and the deterioration of the local environment. However, impacts from human activities a

Development and Application of Optical Dating Using Quartz and Potassium-feldspar from Quaternary Sediments

Author : Bo Li (Ph. D.)
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Development and Application of Optical Dating Using Quartz and Potassium-feldspar from Quaternary Sediments by : Bo Li (Ph. D.)

Download or read book Development and Application of Optical Dating Using Quartz and Potassium-feldspar from Quaternary Sediments written by Bo Li (Ph. D.) and published by . This book was released on 2007 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Introduction to Optical Dating

Author : M. J. Aitken
Publisher : Clarendon Press
ISBN 13 : 0191589276
Total Pages : 282 pages
Book Rating : 4.1/5 (915 download)

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Book Synopsis Introduction to Optical Dating by : M. J. Aitken

Download or read book Introduction to Optical Dating written by M. J. Aitken and published by Clarendon Press. This book was released on 1998-07-09 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical dating is a rapidly developing technique, used primarily in the dating of sediments deposited in the last 500,000 or more years. As such increasing numbers of Quaternary geologists, physical geographers, archaeologists, and anthropologists are now relying on the results produced. Written by one of the foremost experts on optical dating, this book aims to bring together in a coherent whole the various strands of research that are ongoing in the area. It gives beginners an introduction to the technique as well as acting as a valuable source of up to date references. The text is divided into three parts; main text, technical notes and appendices. In this way the main text is accessible by those researchers with a limited knowledge of physics, with the technical notes providing depth of understanding for those who require it. The first part of the book is concerned with basic notions and an introduction to the standard techniques, as well as several illustrative case histories. It goes on to then discuss the limitations of the technique and factors affecting reliability.

APPLICATION OF OPTICAL DATING

Author : Zhijun Gong
Publisher : Open Dissertation Press
ISBN 13 : 9781361004876
Total Pages : 276 pages
Book Rating : 4.0/5 (48 download)

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Book Synopsis APPLICATION OF OPTICAL DATING by : Zhijun Gong

Download or read book APPLICATION OF OPTICAL DATING written by Zhijun Gong and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Application of Optical Dating to Late Quaternary Uplift and Thrust Activity in the Northern Piedmont of Tian Shan, China" by Zhijun, Gong, 龚志军, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Tian Shan is one of the most important orogenic belts in central Asia. It has been reactivated as a result of the Cenozoic India-Eurasia collision. Dating of the late Cenozoic tectonic deformation of Tian Shan and its piedmonts is important for understanding the mountain building as well as evaluating seismic hazards in the region. This study is focused on the applications of optical dating to the late Quaternary uplift and thrust activity along Manas River, in the northern piedmont of the Tian Shan, China. The sediments on river terraces were dated with optical dating. The elevations were measured with the kinematic global position system (GPS). The results suggest that two phases can be identified according to the significantly different river incision rates. One phase was from 20 ka to 4.8 ka, with a much slower incision rate of 2.2 0.6 mm/yr. The other phase was from 4.8 ka to present, with a faster incision rate of 13.5 0.6 mm/yr. The accelerated incision rate of Manas River was mainly attributed to the tectonic forces, suggesting that the tectonic uplift was significantly intensified since 4.8 ka in the northern piedmont of Tian Shan. The study region has suffered from multiple thrust activities during the late Quaternary, which led to the intensive deformations of the river terraces. By studying the deformed terraces, I evaluated the timing of the past thrust activities as well as the vertical slip rate of the thrust faults. The results demonstrated that the thrust activity intensified during the late Holocene, as manifested by the more frequent thrust activities and higher vertical slip rates. Both quartz and potassium feldspar can be as dosimeters for optical dating of sediments. However, quartz OSL is sometimes seriously impeded with problems such as very dim signals and insufficient bleaching problems. K-feldspar has attractive advantages over quartz, despite of problem of anomalous fading. K-feldspar was explored in this study, by investigating the relationship between the infrared stimulated luminescence (IRSL) and blue light stimulated luminescence (BLSL) signals. For IRSL and BLSL at 60 C, it was suggested that most of the IRSL could be bleached by blue light (BL), while the BLSL could only be partially bleached by infrared (IR) stimulation. Besides, the fast and medium components of BLSL were mainly associated with the IRSL. If IR stimulation temperature was raised from 60 to 200 C, at least two portions of the IRSL signals at 200 C were observed. One portion could be bleached by BL at 60 C and the other portion was hardly bleached by BL at 60 C. Dating of K-feldspar from the various signals provided cross-checking for the reliability of quartz OSL for dating sedimentary samples. DOI: 10.5353/th_b4979920 Subjects: Optically stimulated luminescence dating Geology, Stratigraphic - Quaternary Thrust faults (Geology) - Tien Shan

Optical Dating of Quartz from Young Deposits

Author : Mirko Ballarini
Publisher : IOS Press
ISBN 13 : 9781586036164
Total Pages : 164 pages
Book Rating : 4.0/5 (361 download)

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Book Synopsis Optical Dating of Quartz from Young Deposits by : Mirko Ballarini

Download or read book Optical Dating of Quartz from Young Deposits written by Mirko Ballarini and published by IOS Press. This book was released on 2006 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optically Stimulated Luminescence (OSL) dating is a tool used in Quaternary Geology for assessing ages of depositional mineral grains such as quartz, feldspars and zircons. In particular, OSL showed to be exceptionally robust and reliable for dating quartz samples. OSL dating relies on the assumption that the luminescence signal of grains is fully reset to zero by sunlight exposure before deposition. If this requirement is not fulfilled (i.e. grains were 'poorly-bleached'), ages may be grossly overestimated. In particular, poor-bleaching can significantly affect age estimations of young sediments. Standard procedures for estimating the burial dose of a sediment make use of a large number of grains (aliquot) that is measured simultaneously. This approach has been shown to work well, but only on homogeneously bleached sediments. An alternative way to investigate poor-bleaching within a sample is to measure the OSL signal from individual grains rather than from aliquots made up of several thousands of grains. The advantage is that individual grains with large doses (possibly due to poor-bleaching) can be identified and dealt with. detectable signals and luminescence responses are weak. The aim of this publication is to determine the feasibility of applying dating techniques to individual grains of quartz from deposits formed within the last 300 years.

Methods in Dating and Other Applications using Luminescence

Author : James K. Feathers
Publisher : MDPI
ISBN 13 : 3039287923
Total Pages : 194 pages
Book Rating : 4.0/5 (392 download)

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Book Synopsis Methods in Dating and Other Applications using Luminescence by : James K. Feathers

Download or read book Methods in Dating and Other Applications using Luminescence written by James K. Feathers and published by MDPI. This book was released on 2020-12-14 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trapped charge dating is a commonly used chronological tool in Earth Sciences and Archaeology. The two principle methods are luminescence dating and electron spin resonance. Both are based on stored energy produced by the absorption of natural radioactivity in common minerals such as quartz and feldspars, and in some biological materials such as tooth enamel. Methodological developments in the last 20 years have substantially increased the accuracy and precision of these methods. This compilation offers a taste of the recent research into both method and applications.

DEVELOPMENT OF LUMINESCENCE DA

Author : Xiao Fu
Publisher : Open Dissertation Press
ISBN 13 : 9781361021408
Total Pages : 306 pages
Book Rating : 4.0/5 (214 download)

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Book Synopsis DEVELOPMENT OF LUMINESCENCE DA by : Xiao Fu

Download or read book DEVELOPMENT OF LUMINESCENCE DA written by Xiao Fu and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Development of Luminescence Dating Using Feldspar and Its Application to River Terraces in North Piedmont of Chinese Tianshan" by Xiao, Fu, 付晓, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: This study focused on developing luminescence dating procedures for feldspar, and the application of the luminescence dating technique to fluvial terraces of Anjihai River in the northern piedmont of Tian Shan range, China, to evaluate the deformation rate of the Anjihai anticline in the late Quaternary. To develop luminescence dating methods, a low temperature multi-elevated-temperature post-infrared infrared stimulated luminescence (MET-pIRIR) protocol has been proposed for measuring the Holocene samples using K-feldspar. Progressively increasing IR stimulation temperatures from 50 to 170 C in step of 30C were used in the protocol. The residual doses for the MET-pIRIR signals were generally less than 1 Gy. This protocol was further simplified to a three-step pIRIR method, with three stimulation temperatures of 110, 140 and 170C. It has been shown that these new pIRIR methods can be applied successfully to aeolian samples within the Holocene. A high temperature MET-pIRIR dating protocol was initially applied to polymineral fine grains (4-11 μm), recovered from Chinese loess samples collected at Luochuan that accumulated within the last glacial-interglacial period. The MET-pIRIR ages for fine grains were compared with the coarse grain (63-90 μm) K-feldspar MET-pIRIR ages and the coarse grain quartz OSL ages, and the stratigraphic age controls. The results show that the MET-pIRIR protocol can be applied to fine grains from these loess samples without fading correction. A plateau test, termed the De (T, t) plot, was proposed as a self-diagnosing tool for the pIRIR dating protocols. The pattern of the De (T, t) plot was shown to be affected by non-bleachable signal, partial bleaching and anomalous fading effects. The achievement of a plateau in the De (T, t) plot indicates that the non-fading signal has been achieved, and the effects of non-bleachable dose and partial bleaching are negligible. The De (T, t) test was successfully applied to different pIRIR protocols. A series of loess and fluvial sand samples were collected from the north piedmont of Tian Shan range to determine appropriate dating procedures for samples in this area. Luminescence properties of quartz and K-feldspar grains extracted from these samples were investigated. The extent of bleaching for the samples and the reliability of the measured ages were assessed based on equivalent dose distribution and age comparison between chronometers. Optimized dating procedures for samples in north Tian Shan have been proposed. K-feldspar MET-pIRIR dating is recommended for the loess samples, while single aliquot quartz OSL dating is suggested for the fluvial sand samples, after consideration of signal brightness and the extent of signal resetting. The dating procedures proposed above were applied to the deformed fluvial terraces of Anjihai River in the north flank of Tian Shan. Combined with topographic measurements, the deformation rate of the Anjihai anticline was calculated. The average shortening rates of the Anjihai anticline since 3.6 0.1, 9.0 0.6 and 53.3 2.2 ka were calculated to be 1.4 0.3, 1.2 0.3 and 0.5 0.1 mm/a, respectively. It suggests that the northern Tian Shan region was tectonically active during the late Quaternary, especially in the Holocene. DOI: 10.5353/th_b5351007 Subjects: Luminescence dating Sediment transport

Luminescence

Author : Jagannathan Thirumalai
Publisher : BoD – Books on Demand
ISBN 13 : 9535127624
Total Pages : 390 pages
Book Rating : 4.5/5 (351 download)

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Book Synopsis Luminescence by : Jagannathan Thirumalai

Download or read book Luminescence written by Jagannathan Thirumalai and published by BoD – Books on Demand. This book was released on 2016-11-10 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to give readers a broad review of topical worldwide advancements in theoretical and experimental facts, instrumentation and practical applications erudite by luminescent materials and their prospects in dealing with different types of luminescence like photoluminescence, electroluminescence, thermo-luminescence, triboluminescence, bioluminescence design and applications. The additional part of this book deals with the dynamics, rare-earth ions, photon down-/up-converting materials, luminescence dating, lifetime, bioluminescence microscopical perspectives and prospects towards the basic research or for more advanced applications. This book is divided into four main sections: luminescent materials and their associated phenomena; photo-physical properties and their emerging applications; thermoluminescence dating: from theory to applications, and bioluminescence perspectives and prospects. Individual chapters should serve the broad spectrum of common readers of diverse expertise, layman, students and researchers, who may in this book find easily elucidated fundamentals as well as progressive principles of specific subjects associated with these phenomena. This book was created by 14 contributions from experts in different fields of luminescence and technology from over 20 research institutes worldwide.

Encyclopedia of Scientific Dating Methods

Author : W. Jack Rink
Publisher : Springer
ISBN 13 : 9789400763036
Total Pages : 978 pages
Book Rating : 4.7/5 (63 download)

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Book Synopsis Encyclopedia of Scientific Dating Methods by : W. Jack Rink

Download or read book Encyclopedia of Scientific Dating Methods written by W. Jack Rink and published by Springer. This book was released on 2015-08-15 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides an overview of (1) the physical and chemical foundations of dating methods and (2) the applications of dating methods in the geological sciences, biology, and archaeology, in almost 200 articles from over 200 international authors. It will serve as the most comprehensive treatise on widely accepted dating methods in the earth sciences and related fields. No other volume has a similar scope, in terms of methods and applications and particularly time range. Dating methods are used to determine the timing and rate of various processes, such as sedimentation (terrestrial and marine), tectonics, volcanism, geomorphological change, cooling rates, crystallization, fluid flow, glaciation, climate change and evolution. The volume includes applications in terrestrial and extraterrestrial settings, the burgeoning field of molecular-clock dating and topics in the intersection of earth sciences with forensics. The content covers a broad range of techniques and applications. All major accepted dating techniques are included, as well as all major datable materials.

Trapped charge dating and its application in geomorphological, geological and archaeological studies in east asia

Author : Hui Zhao
Publisher : Frontiers Media SA
ISBN 13 : 2832514928
Total Pages : 194 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Trapped charge dating and its application in geomorphological, geological and archaeological studies in east asia by : Hui Zhao

Download or read book Trapped charge dating and its application in geomorphological, geological and archaeological studies in east asia written by Hui Zhao and published by Frontiers Media SA. This book was released on 2023-02-17 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Testing the Use of Single Grains of K-feldspar for Luminescence Dating of Proglacial Sediments in Patagonia

Author : Rachel K. Smedley
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Testing the Use of Single Grains of K-feldspar for Luminescence Dating of Proglacial Sediments in Patagonia by : Rachel K. Smedley

Download or read book Testing the Use of Single Grains of K-feldspar for Luminescence Dating of Proglacial Sediments in Patagonia written by Rachel K. Smedley and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Encyclopedia of Geoarchaeology

Author : Allan S. Gilbert
Publisher : Springer
ISBN 13 : 9789400748279
Total Pages : 0 pages
Book Rating : 4.7/5 (482 download)

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Book Synopsis Encyclopedia of Geoarchaeology by : Allan S. Gilbert

Download or read book Encyclopedia of Geoarchaeology written by Allan S. Gilbert and published by Springer. This book was released on 2016-08-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geoarchaeology is the archaeological subfield that focuses on archaeological information retrieval and problem solving utilizing the methods of geological investigation. Archaeological recovery and analysis are already geoarchaeological in the most fundamental sense because buried remains are contained within and removed from an essentially geological context. Yet geoarchaeological research goes beyond this simple relationship and attempts to build collaborative links between specialists in archaeology and the earth sciences to produce new knowledge about past human behavior using the technical information and methods of the geosciences. The principal goals of geoarchaeology lie in understanding the relationships between humans and their environment. These goals include (1) how cultures adjust to their ecosystem through time, (2) what earth science factors were related to the evolutionary emergence of humankind, and (3) which methodological tools involving analysis of sediments and landforms, documentation and explanation of change in buried materials, and measurement of time will allow access to new aspects of the past. This encyclopedia defines terms, introduces problems, describes techniques, and discusses theory and strategy, all in a format designed to make specialized details accessible to the public as well as practitioners. It covers subjects in environmental archaeology, dating, materials analysis, and paleoecology, all of which represent different sources of specialist knowledge that must be shared in order to reconstruct, analyze, and explain the record of the human past. It will not specifically cover sites, civilizations, and ancient cultures, etc., that are better described in other encyclopedias of world archaeology. The Editor Allan S. Gilbert is Professor of Anthropology at Fordham University in the Bronx, New York. He holds a B.A. from Rutgers University, and his M.A., M.Phil., and Ph.D. were earned at Columbia University. His areas of research interest include the Near East (late prehistory and early historic periods) as well as the Middle Atlantic region of the U.S. (historical archaeology). His specializations are in archaeozoology of the Near East and geoarchaeology, especially mineralogy and compositional analysis of pottery and building materials. Publications have covered a range of subjects, including ancient pastoralism, faunal quantification, skeletal microanatomy, brick geochemistry, and two co-edited volumes on the marine geology and geoarchaeology of the Black Sea basin.

Encyclopedia of Quaternary Science

Author : Cary Mock
Publisher : Newnes
ISBN 13 : 0444536426
Total Pages : 3883 pages
Book Rating : 4.4/5 (445 download)

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Book Synopsis Encyclopedia of Quaternary Science by : Cary Mock

Download or read book Encyclopedia of Quaternary Science written by Cary Mock and published by Newnes. This book was released on 2013-03-25 with total page 3883 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second revised edition of the Encyclopedia of Quaternary Science, Four Volume Set, provides both students and professionals with an up-to-date reference work on this important and highly varied area of research. There are lots of new articles, and many of the articles that appeared in the first edition have been updated to reflect advances in knowledge since 2006, when the original articles were written. The second edition will contain about 375 articles, written by leading experts around the world. This major reference work is richly illustrated with more than 3,000 illustrations, most of them in colour. Research in the Quaternary sciences has advanced greatly in the last 10 years, especially since topics like global climate change, geologic hazards and soil erosion were put high on the political agenda. This second edition builds upon its award-winning predecessor to provide the reader assured quality along with essential updated coverage Contains 357 broad-ranging articles (4310 pages) written at a level that allows undergraduate students to understand the material, while providing active researchers with a ready reference resource for information in the field. Facilitates teaching and learning The first edition was regarded by many as the most significant single overview of Quaternary science ever, yet Editor-in-Chief, Scott Elias, has managed to surpass that in this second edition by securing even more expert reviews whilst retaining his renowned editorial consistency that enables readers to navigates seamlessly from one unfamiliar topic to the next

An Introduction to Optical Dating

Author :
Publisher :
ISBN 13 :
Total Pages : 267 pages
Book Rating : 4.:/5 (667 download)

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Book Synopsis An Introduction to Optical Dating by :

Download or read book An Introduction to Optical Dating written by and published by . This book was released on 1998 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Testing the Use of Single Grains of K-feldspar for Luminescence Dating of Proglacial Sediments in Patagonia

Author : Rachel Katie Smedley
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (111 download)

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Book Synopsis Testing the Use of Single Grains of K-feldspar for Luminescence Dating of Proglacial Sediments in Patagonia by : Rachel Katie Smedley

Download or read book Testing the Use of Single Grains of K-feldspar for Luminescence Dating of Proglacial Sediments in Patagonia written by Rachel Katie Smedley and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years single-grain dating of quartz has been used to provide luminescence ages of proglacial sediments but the poor sensitivity of the optically stimulated luminescence (OSL) signal of quartz can make dating in some geographical regions challenging. The main aim of this study is to improve luminescence dating in glacial environments by developing and testing methods of single-grain dating of K-feldspars from proglacial sediments using the post-IR infra-red stimulated luminescence (pIRIR) signal. The Lago Buenos Aires valley in Patagonia was chosen as the study site because the existing chronology in the valley that constrains the ages of moraine deposition provides a rare opportunity to compare luminescence dating of proglacial sediments with ages determinedusing independent dating techniques.A number of challenges associated with single-grain luminescence dating of Kfeldspar are addressed in this study in order to provide accurate ages using the technique. This includes developing a procedure using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to directly measure the internal K-content of individual grains of K-feldspar, and provide an average internal K-content appropriate for single-grain dating where geochemical measurements of individual grains are not available. Experiments are also performed in this study to demonstrate that the reproducibility of single-grain pIRIR luminescence measurements can be optimised by reducing the disc location temperature from an elevated temperature to room temperature and using the IR LEDs to bleach the grains during the SAR cycle. Laboratory bleaching experiments also demonstrate that the bleaching potential of the pIRIR signal is not expected to be a barrier for single-grain dating of samples in this study.Finally, IRSL ages are provided for single grains of K-feldspar from two aeoliandune sand samples that were taken from above and below the Kawakawa tephra from North Island, New Zealand, and for a suite of ten proglacial samples from the Lago Buenos Aires valley that are associated with the deposition of moraine ridges dated using cosmogenic isotope dating and 40Ar/39Ar dating. The ages ranging from 15 - 111 ka presented in this study agree with the independent numerical age control within dating uncertainties. Therefore, this study suggests that the technique can be used to provide accurate ages for aeolian and proglacial sediments.

Age Determination of Young Rocks and Artifacts

Author : Günther A. Wagner
Publisher : Springer Science & Business Media
ISBN 13 : 3662036762
Total Pages : 488 pages
Book Rating : 4.6/5 (62 download)

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Book Synopsis Age Determination of Young Rocks and Artifacts by : Günther A. Wagner

Download or read book Age Determination of Young Rocks and Artifacts written by Günther A. Wagner and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dating the Quaternary, which covers approximately the last 2 million years, has experienced considerable progress over the past few decades. On the one hand, this resulted from the necessity to obtain a valid age concept for this period which had seen tremendous environmental changes and the advent of the genus Homo. On the other hand, instrumental improvements, such as the introduction of highly sensitive analytical techniques, gave rise to physical and chemical innovations in the field of dating. This rapid methodological development is still in full progress. The broad spectrum of chronometric methods applicable to young rocks and artifacts also becomes increasingly intricate to the specialist. Hence, it is my goal to present a comprehensive, state-of-the-art sum mary of these methods. This book is essentially designed as an aid for scientists who feel a demand for dating tasks falling into this period, i. e., Quaternary geologists and archaeologists in the broadest sense. Since it has been developed from a course of lectures for students of geological and archaeological sciences, held at the University of Heidelberg, it certainly shall serve as an introduction for students of these disciplines.

Optically Stimulated Luminescence (OSL) Dating in the Amazonian Wetlands

Author : Sonia Hatsue Tatumi
Publisher : Cambridge Scholars Publishing
ISBN 13 : 1527556069
Total Pages : 146 pages
Book Rating : 4.5/5 (275 download)

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Book Synopsis Optically Stimulated Luminescence (OSL) Dating in the Amazonian Wetlands by : Sonia Hatsue Tatumi

Download or read book Optically Stimulated Luminescence (OSL) Dating in the Amazonian Wetlands written by Sonia Hatsue Tatumi and published by Cambridge Scholars Publishing. This book was released on 2020-07-09 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optically stimulated luminescence (OSL) dating has proven to be extremely useful for establishing the Late Quaternary chronological framework in many areas of the Brazilian territory. In this region dominated by tropical climate, OSL dating can be more extensively applied than radiocarbon dating due to the generally low potential for the preservation of organic matter in sedimentary samples. This problem is especially critical in areas of the Amazonian lowlands, because of the hot climate and high precipitation rates. The abundance of quartz grains deposited in fluvial and aeolian environments over this region favours OSL dating. More than 20 years of continuous and collaborative work has resulted in the creation of an extensive OSL age database for Late Quaternary sedimentary deposits in the Amazonian lowlands. This effort has contributed to improving the paleoenvironmental and paleoclimatic reconstructions of this region within this period. This book discusses the state of art of OSL dating of Late Quaternary deposits in the Amazonian lowlands, focusing on providing an introduction to dating principles using OSL, and defining the application of OSL techniques as a dating method. It also offers a statistical study and calculation of equivalent dose and annual dose rates, details the sampling and experimental apparatus, and considers the difficulties and adaptation techniques in dating Late Quaternary strata in the Amazonian lowlands.