Stromatactic patterns formation in geological sediments: field observations versus experiments

0348537 - GLÚ 2011 RIV DE eng C - Conference Paper (international conference)
Hladil, Jindřich - Růžička, Marek
Stromatactic patterns formation in geological sediments: field observations versus experiments.
Particle-Laden Flow : from Geophysical to Kolmogorov Scales. Berlin: Springer, 2007, s. 85-94. ISBN 978-1-4020-6217-9.
[Colloquium on Particle-Laden Flow. Enschede (NL), 21.06.2006-23.06.2006]
R&D Projects: GA ČR GA104/07/1110; GA ČR(CZ) GA104/05/2566; GA ČR GA104/06/1418; GA AV ČR IAAX00130702
Institutional research plan: CEZ:AV0Z30130516; CEZ:AV0Z40720504
Keywords : sedimentation of particulate suspensions * polydispersion * stromatactic patterns formation
Subject RIV: DB - Geology ; Mineralogy

We demonstrate a novel purely hydrodynamic concept of formation of stromatactic cavities in geological sediments, originated by the recent experiments with artificial complex mixtures of grains and based also on the sedimentation of simplified model particulates. First, the characteristic features of these cavities are described, as for their geometry and occurrence in the sedimentary rocks, and the several existing contemporary concepts of their formation are briefly reviewed. Then the new concept is introduced, and laboratory experiments described that were designed to validate it. Finally, the result obtained are presented and discussed, and the prospect for the future research is outlined. Note that the stromatactic patterns are three-dimensional cavities which are formed inside the rapidly thickening suspension/sediment. These are not the surface-related patterns like ripples or dunes.
Permanent Link: http://hdl.handle.net/11104/0006049