Irsl dating sites
These new age estimates allow us to demonstrate a significantly enhanced slip rate for the last two thousand years in comparison to the Holocene and Geologic mean slip rates.
The radiation () comes from radionucleides which are present in the mineral and its natural environment, mainly uranium, thorium (and their decay products), potassium, and for a small proportion from cosmic particles (Aitken, 1985).The patterns of apparent age distribution between individual grains in each sample provide some insight into transport and depositional conditions at the time of sedimentation, and have the potential to provide histories for sediment transport rates and storage.This paper aims to provide an overview concerning the optically stimulated luminescence (OSL) dating method and its applications for geomorphological research in France.L’objectif de cet article est de proposer une présentation d’ensemble des méthodes de datations par luminescence stimulée optiquement (OSL) et de leurs applications dans le champ des recherches en géomorphologie.Après une présentation des principes physiques généraux, les procédures mises en œuvre aussi bien sur le terrain qu’en laboratoire sont abordées, à partir de l’exemple des analyses réalisées sur des alluvions sableuses issues d’une basse terrasse de la Moselle.The total amount of trapped electrons within a crystal is proportional to the total energy absorbed and retained by the crystal (or dose), hence the time it was exposed to radiation.
As soon as the mineral is exposed to sunlight, for example during its transport, trapped electrons absorb the photon energy (from the Sun), and are released from the traps.
; Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California, USA), AB(Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California, USA), AC(Department of Earth Sciences, University of Southern California, Los Angeles, California, USA), AD(Department of Geological Sciences, California State University, San Bernardino, California, USA) New developments in single grain Infra-Red Stimulated Luminescence (IRSL) of potassium feldspar using a post-IR IRSL approach is providing a radically improved degree of resolution in age estimates of sediment deposition for fluvial and alluvial sediments offset by fault movement.
In the Mojave Desert, California, the timing and slip history of the left-lateral Central Garlock fault can be reconstructed by applying IRSL dating to offset alluvial fan sediments deposited on the margins of the paleo Lake Searles/China Lake system at Christmas Canyon West, combined with high resolution earthquake event history based on radiocarbon age control from the nearby site of El Paso Peaks.
The paper then explains how OSL dating is applied to obtain a depositional age, through the field and laboratory procedures employed.
These procedures are described as clearly as possible in order to provide useful information for geomorphologists interested in the method, and illustrated by a case study that has involved luminescence dating of fluvial sands (samples LUM 975 and LUM 978) from the lower alluvial terrace of the Moselle River (M1 terrace as defined by S. However, it is essential to keep in mind that the protocols (preparation of the sediments, measurements) may vary from one laboratory to the other: the presentation does not aim to be exhaustive, but to reference the main procedures at each step of the dating.
La place des datations OSL dans la recherche géomorphologique en France et son potentiel pour les recherches futures sont décrits à travers une présentation de la diversité des environnements sédimentaires et des problématiques pouvant être traités.