Dating techniques in geomorphology
With newly instated Argentine laws protecting many icy landscapes, there is a great impetus to identify relict vs. As part of a multi-university collaborative effort, UD researchers and students provide non-invasive analyses of landform movements using differential terrestrial-laser-scanner models. Lichenometric Dating of Rock Surfaces in the Northern Cascade Range, USA (vol 95, pg 241, 2013). These data are complemented with other methods of detecting surface movement based on GPS and remote sensing techniques.
A case study of fluvial sands from the lower terrace of the Moselle valley is then presented to describe the range of field and laboratory procedures required for successful luminescence 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.
On the contrary, defects situated deeper inside the lattice have a higher thermal lifetime.
These “deep traps” (stable traps associated with high energy levels) can adequately be used for dating.