The origin of a giant downward directed clastic dyke in a kame (Be?chatów mine,central Poland) |
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Institution: | 1. Department of Geomorphology, Faculty of Geographical Sciences, University of ?ód?, Narutowicza 88, 90-139 ?ód?, Poland;2. Faculty of Earth Sciences, University of Silesia, B?dzińska 60, 41-200, Sosnowiec, Poland |
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Abstract: | A kame near Czubata Góra in the Pleistocene overburden of the Be?chatów open-cast browncoal mine in central Poland shows several types of deformations. A number of diapirs occur, but also a structure that shows all characteristics of a diapir but consists of sediments that apparently intruded the underlying rather than the overlying sediments. Analysis of this structure shows that it consists of material that was originally deposited as a fine-grained (mainly silty) glacilacustrine sediment. Seismic activity triggered the material to fluidise, resulting in a structureless mass. Part of the fluidised material flowed down into a fissure that had formed in the underlying sediments (probably due to tectonics in the active graben), thus forming a clastic dyke; more of the overlying silty material was later pressed down into a dyke with the shape of a downward directed diapir. |
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