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EN
Textural and structural diversity of slope covers and alluvial deposits in the upper parts of mid-mountain valleys in the Eastern Sudetes allows for assessing human impact on their formation. Sandy-silty colluvial deposits in the lower parts of slopes or within local flats and slope depressions originate due to enhanced surface wash from arable grounds, in contrast to underlying coarser material with solifluctional features. Similarly, fine-grained overbank alluvial deposits can be also connected with human activity, as the slope material, washed down from arable fields, was transported to the channels and deposited within the floodplains during high-water stages. Their linkages with human activity have been confirmed by radiocarbon dating of charcoal found at the bottom of these sediments. The dates show a strong correlation with the dates of foundation of villages in the study area. The development of agriculture and deforestation of slopes resulted in increasing surface wash and transportation of slope material to footslopes and river channels. The extent of deposits, which can be correlated with human activity, is much more widespread than it was suggested before and they are found as high as 800 m a.s.l. Their thickness, however, is visibly smaller in comparison to colluvial or alluvial sediments deposited in the Sudetes foreland and it is strongly influenced by the local morphology. According to the 14C dating, these sediments are also much younger than those in the foreland, which corresponds to a substantial delay in human settlement expansion into the mountain areas.
PL
Dla rozstrzygnięcia problemu allo- bądź autochtoniczności osadów pylastych, współtworzących pokrywy stokowe Ślęży (718 m n.p.m.) na Przedgórzu Sudeckim zastosowano metodę określania składu chemicznego detektorem rentgenowskim ECON. Wobec braku minerałów z grupy krzemionki w budującym wschodni stok Ślęży gabrze oraz ich znacznym udziale (około 70%) w analizowanych próbach, reprezentujących osady z wysokości 280-508 m n.p.m., wykazano allochtoniczność osadów pyłowych. Stwierdzenie to, w połączeniu z pozycją geomorfologiczą osadów i ich cechami litologicznymi, pozwoliło na wykluczenie innych niż eoliczny procesów mogących odpowiadać za ich depozycję.
EN
Mapping of the chemical composition of the siltfraction which composes to a considerable extent the slope covers ofMt. Ślęża (718 m a.s. I.), Sudetic Foreland, SW Poland has been carried out in order to verify their alio- or autochtonism. An X-ray detector ECONhas been used. Lack of the silica minerals within the rock composing eastern slope of the Mt Ślęża, i.e. gabbro, compared with an abundant (70%) occurrence of such minerals within the samples derived from different altitudes (280-508 m a.s. I.), allowed one to state the allochtonism of the siltfraction. Taking into account both this statement and the geomorphological setting and the lithological features of the silty deposits, one can exclude all processes other than aeolian activity as potential factors of deposition of these sediments.
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