Quartz osl dating
They lead to the emission of electrons which are subsequently trapped in crystalline lattice defects.
Some of the traps are considered ‘unstable’ (“shallow traps”), which means that an electron inside will not remain trapped for the whole duration of burial.
Improvements of this technique led to the development, for more than twenty years, of the optical dating method [commonly referred to as Optically Stimuled Luminescence (OSL)] which is now applied to sediments from various origins (Wintle, 2008).
The aim of this paper is to provide people involved in geomorphological research a global overview about the principles and procedures of optical dating, from the field sampling to the age interpretation.
It is exposed again to radiation and accumulates trapped electrons.
Hence it underlines the increasing importance of the method to geomorphological research, especially by contributing to the development of quantitative geomorphology.
The rate of release depends on four main parameters: i) the kind of mineral: the eviction occurs faster for quartz than for feldspars (reduction of the luminescence signal by a factor of 100 in ~ 20 s for the former, but a few minutes for the latter; Godfrey-Smith , these are more efficient to stimulate and release the electrons.
Feldspars have the specificity of being sensitive both to short and to near-infrared or infrared wavelength (800-950 nm; Bøtter-Jensen ., 1994); iv) the sensitivity of the trap to light.
Absolute dating methods have been developed over the last five decades (Jull and Scott, 2007).
They are now largely used to date not only palaeontological or organic remains, but also minerals that characterise detrital clastic sedimentary material.