Plaice (geology)
In geology , the term tectonic clod describes a piece of the earth's crust that is separated from other clods by tectonic joints such as faults or crevices .
The separating joints are also called clod seams . Often these joints have similar directions. That is why, for example, a relay break is also referred to as a clod staircase . The relatively higher lying floe is then the high floe , the sunk or not raised floe the deep floe . About its longitudinal axis tilted clods hot Kippschollen , desk clods or clumps half and half or trenches. Remnants of tectonic thrusts are sometimes called deck floes . On the other hand, the individual clods can also have been moved in different directions to one another. The resulting landforms are called Bruchschollengebirge .
A neighboring rock block, on the other hand, is a foreign piece of rock that is enclosed within an igneous rock body. Usually it comes directly from the surrounding host rock. Sometimes the plaice can come from far away areas ( xenolite , colloquially also “fish”).
In a thin lava flow , the already solidified crust is often torn into tabular pieces, which are then piled up in random masses. The cooled rock is then referred to as plaice lava .
literature
- Hans Murawski, Wilhelm Meyer: Geological dictionary. 10th edition, Enke Verlag, Stuttgart 1998, ISBN 3-432-84100-0 .