Optical dating of sediments
These micas vary in chemical composition but are all sheet silicate minerals with very similar physical properties.A generalized chemical composition for the biotite group is: The name "biotite" is used in the field and in entry-level geology courses because these minerals generally cannot be distinguished without optical, chemical, or x-ray analysis.Point measurements are collected from just a small number of reference glaciers. But the advent of remote sensing over the last 40 years has opened up unparalleled opportunities for glacier observation. A preliminary inventory of rock glaciers at 30°S latitude, Cordillera Frontal of San Juan, Argentina. Aitken has set out to offer an understanding of the basic principles and procedures in optical dating, as well as its scope and limitations.He has succeeded in doing so for those who may have only a minimal background in physics.last modified: Sunday, 05-Jun-2016 CEST Most books on minerals are field guides and "picture books". They can help to identify your specimen and to learn something about their properties, but they don't get you anywhere beyond that. Silica Minerals John Wiley, New York and London, 1962 Jaroslav Hyrsl, Gerhard Niedermayr Magic World: Inclusions in Quartz / Geheimnisvolle Welt: Einschlüsse im Quarz Bode Verlag Gmb H, Haltern, 2003 ISBN 3-925094-81-4 L.
Biotite is very easy to identify, and with a little experience a person will be able to recognize it on sight.
This method has developed slowly since 1985, and much about it is explained in clear . Although new retired from active research, he has provided for the lay reader a thorough review of the most important recent advance in the field; the use of photon-stimulated luminescence for dating Quaternary sediments, or optical dating.
This rather technical book is designed almost as a manual for the extraction and evaluation of dates by the method usually known as OSL (optically stimulated luminescence), an approach similar to TL but applied to sediment grains, usually sand or loessic silt, younger than about half a million years in age. fashion by Aitken."--"If anyone can be considered the father of luminescence dating, it is Martin Aitken.
Thermoluminescence (TL) and electron spin resonance (ESR) methods have been important in dating heated stone tools and buried tooth enamel, especially in the context of early modern humans and Neanderthals during the last few hundred thousand years.
[M]uch recent effort has been devoted to varieties of trapped-charge dating, which depends broadly on the accumulation of incident energy by electrons.