Within geology there are many instances of nature providing only the end-points of tectonic processes, with it being unclear how a given starting point gave rise to a modern day
Within geology there are many instances of nature providing only the end-points of tectonic processes, with it being unclear how a given starting point gave rise to a modern day formation or structure. Accretionary complexes are the ultimate result of sediment accumulating by the “scrapping-off” of sediments from a subducting plate. They form at convergent margins and can be found in present day Japan and Scotland. Scaled analogue experiments are useful for gaining insight into the kinematic and dynamic evolution of geological structures like accretionary complexes, and provide an opportunity to observe how an accretionary complex might form from modern day accretionary wedges. Analogue models can be carried out using many kinds of material, but in this case dry sand (sandbox experiments) is used as an analogue for geological structures deforming in a brittle manner.
In this talk, I will introduce the basic concept and show results from sandbox experiments of accretionary complexes and explain how image analyses and/or XCT-medical imaging technology can be used to “look inside” these model accretionary prisms as well as their real life counterparts. The results provide an important cause and effect story that can be used to understand how accretionary prisms go through cycles of uplift as their fault systems develop and sediment accretes. The models also make predictions about the subsurface properties of deep crustal structures, important structural-features that might otherwise never be encountered.
(Thursday) 6:30 pm - 8:30 pm
Lecture Theatre 1 - Meston Building
Meston Building, King's College, University of Aberdeen, Aberdeen, AB24 3UE