Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Changes of microchemical composition of the psammitic fraction of the Kamenice-brook sediments in the profile between the town of Tanvald and the mouth into the Jizera River at Spálov, northern Bohemia
Abstract
Previous knowledge on systematic changes in the composition of the psammintic fraction of recent fluvial sediments of the Kamenice-brook concerned the mineral composition, macrochemistry and transitional metals. Now, it has been extended also for a set of selected trace elements. While the contents of some metals as Ta and W downstream increase, the amount of Rb, Sb,Th, U and of all REE drops step-by-step in the same direction. It is caused by a steady decrease of the ratio of granitoid clasts versus metamorphic clasts in a direct linkage with the composition of the bedrock consiting of granitoids in the upper part and of a weakly metamorphosed volcanosedimentary complex in the middle and lower sector of the brook stream. This ratio is further sensibly controlled by the length of the transport.
