Optical Dating Of Quartz From Young Deposits

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Optical Dating Of Quartz From Young Deposits

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Author : Mirko Ballarini
language : en
Publisher: IOS Press
Release Date : 2006

Optical Dating Of Quartz From Young Deposits written by Mirko Ballarini and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.

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.

Introduction To Optical Dating

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Author : M. J. Aitken
language : en
Publisher: Clarendon Press
Release Date : 1998-07-09

Introduction To Optical Dating written by M. J. Aitken and has been published by Clarendon Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-07-09 with Science categories.

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.

Optical Dating Of Quartz From Sediments

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Author : Edward John Rhodes
language : en
Publisher:
Release Date : 1990

Optical Dating Of Quartz From Sediments written by Edward John Rhodes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Thermoluminescence dating categories.

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

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Author : Bo Li, (Wr
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-27

Development And Application Of Optical Dating Using Quartz And Potassium Feldspar From Quaternary Sediments written by Bo Li, (Wr and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with categories.

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

Investigations Into The Problems Associated With The Optical Dating Of Quartz

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Author : Kira E Westaway
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-27

Investigations Into The Problems Associated With The Optical Dating Of Quartz written by Kira E Westaway and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with categories.

This dissertation, "Investigations Into the Problems Associated With the Optical Dating of Quartz" by Kira E, Westaway, 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. DOI: 10.5353/th_b3122004 Subjects: Geological time

On The Dating Of The Last Glacial Cycle In Loess Deposits Using Quartz Optically Stimulated Luminescence

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Author : ConstantinDaniela
language : en
Publisher:
Release Date : 2015

On The Dating Of The Last Glacial Cycle In Loess Deposits Using Quartz Optically Stimulated Luminescence written by ConstantinDaniela and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.

Dating Methods For Quaternary Deposits

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Author : Nathaniel W. Rutter
language : en
Publisher:
Release Date : 1995

Dating Methods For Quaternary Deposits written by Nathaniel W. Rutter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Science categories.

Methods In Dating And Other Applications Using Luminescence

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Author : James K. Feathers
language : en
Publisher: MDPI
Release Date : 2020-12-14

Methods In Dating And Other Applications Using Luminescence written by James K. Feathers and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-12-14 with Science categories.

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.

Quartz Deposits Mineralogy And Analytics

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Author : Jens Götze
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-04-23

Quartz Deposits Mineralogy And Analytics written by Jens Götze and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-04-23 with Science categories.

The book will include contributions of the state of the art of quartz raw materials (deposits and properties) and their analytics. The chapters are presented by leading scientists in the quartz field. The presentations cover the main interrelations between genesis of quartz - formation of specific properties - analytics - industrial applications of SiO2 raw materials.

Optical Dating Of Young Lacust

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Author : Ruochen Wang
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-26

Optical Dating Of Young Lacust written by Ruochen Wang and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-26 with Science categories.

This dissertation, "Optical Dating of Young Lacustrine Sediment From Manas Lake in Northwestern China" by Ruochen, Wang, 王若辰, 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: Manas Lake is a closed and dried lake in Junggar Basin with catchment area of 11,000 square kilometers. The lake is particularly sensitive and important to the study of paleo‐climate changes, because the climate in the catchment area is dominantly influenced by the Westlies. Dating of lake paleo-shorelines and lacustrine sediments can provide chronological evidence of water level and climate changes. No evidence for Holocene high lake level was found by previous studies. The ages of samples were determined using Optical Stimulated Luminescence methodologies. Slope method was used for the determination of equivalent dose of quartz. Series of Lx and Tx from a number of aliquots for each regenerative dose are analyzed to obtain an averaged slop value of the Lx/Tx, by separately fitting Lx-Tx plots under each regenerative dose. In this thesis, slope method was tested for a series of young lacustrine sediment. It is found that using the slope method can save 40% time of conventional SAR procedure. The errors were reduced with large number of natural aliquots. This approach can effectively improve the reliability of optical dating. It is preferred for dating of young samples, because of weak signals and poor precision. Fifteen lacustrine sediments and shoreline deposits were dated. These samples were from a borehole, a profile section and shoreline deposits of the latest high lake level. High-resolution data were achieved by using slope method of OSL signals from quartz for the lacustrine sediments. Magnetic susceptibility of these samples was measured as a proxy for revealing paleo-climate changes. The OSL ages suggested that the lake had experienced a rapid deposition process during 200 600 years ago. Such ages agreed well with the ages of last high lake level, which was the age of little ice age. It is concluded that the paleo-climate of Lake Manas was cold and wet during the little ice age. Sedimentation gaps with age gap of 70ka were found between sediments of little ice age and sediments beneath, from both the lacustrine borehole and paleo‐shorelines. It implies that Lake Manas probably drained for a considerable time. DOI: 10.5353/th_b5334850 Subjects: Lake sediments - China, Northwest Paleolimnology - Holocene