Radiocarbon dating recent applications and future potential cabon dating study
Problems occur when the system is not closed, when uranium or thorium is added or can escape from the system.
In the present context, this can occur when corals are exposed to weathering.
We will first give a short description of the basics of the physical dating methods followed by examples of how these have been applied to different sedimentary environments.
Specific focus will be on Optically Stimulated Luminescence (O) dating, a method that has recently seen a number of innovative applications for reconstructing the environmental history in coastal settings.
Nous présentons un aperçu sur les différentes zones environnementales dans les secteurs côtiers et proposons de résumer les bases physiques des trois méthodes les plus importantes disponibles à ce jour pour dater les sédiments côtiers de l’holocène.
Outre le radiocarbone et la datation série de l’uranium, la luminescence stimulée optiquement (O peut être appliquée à des sédiments à partir de presque n’importe quel type de milieu côtier, couvrant une datation potentielle de quelques années jusqu’à plusieurs centaines de milliers d’années.
This was recently dramatically demonstrated by the devastating tsunamis in the Indian Ocean in 2004 and off the eastern coast of Japan in 2011. The problem is that these approaches only cover the last few centuries and that not all regions have been mapped in detail in the historic past.The second measurement quantifies the amount of radioactive energy absorbed by the minerals by comparing the natural O is that the method relies on quartz and feldspar grains, both of which are found in most coastal sediments.The method does not, in contrast to radiocarbon and uranium series dating, require the presence of organic material and it provides direct depositional ages (last exposure to daylight) for a variety of different coastal features (beaches, dunes, tidal sequences, storm deposits, etc.).When organisms such as corals trigger precipitation of carbonates from seawater to build their exoskeleton, these precipitates will contain U, but no decay products such as Th.While the method was originally developed in the 1950s, it has seen major improvements with regard to accuracy and precision during the last 20 years due to developments in analytical methods.