National Repository of Grey Literature 12 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Valley incision in the Nízké Tatry Mts. (Slovakia) estimated based on paleomagnetic and radiometric cave sediment datings
Kadlec, Jaroslav ; Bella, P. ; Čížková, Kristýna ; Granger, D. E. ; Hercman, H. ; Holúbek, P. ; Chadima, Martin ; Orvošová, M. ; Pruner, Petr ; Schnabl, Petr ; Šlechta, Stanislav
Up to eleven horizontal cave levels occur at different altitudes in Jánska, Demänovská and Mošnická karst valleys in the Nízke Tatry Mts. Most of the caves are filled with allochthonous sediments transported from the area formed mostly by granite. The cave levels were filled with fluvial sediments in dependence on the valleys incision caused by Neogene and Pleistocene uplift of the mountain range. The fluvial sediments are intercalated with, or capped, by flowstone layers in the caves. The paleomagnetic polarities measured both in clastic and chemogenic sediments indicate the age of deposition. Based on obtained polarity data we are able to distinguish cave sediments deposited during the Brunhes, Matuyama and Gauss chrons. The paleomagnetic interpretation was partly verified by U-series datings of flowstones preserved in the sedimentary sections. Except for the horizontal cave levels located in the karst valleys, additional large cave systems were found at extremely high altitudes in the Nízke Tatry Mts. 600–700 m above the lowest horizontal cave level.
The study of sediments and speleothems in the Zbrašov Aragonite Caves
Bosák, Pavel ; Šlechta, Stanislav ; Hercman, H. ; Pruner, Petr
The numerical dating of hydrothemal speleothems (doughnuts) from locality At Crocodile gave older data than was published in the literature: 123 to 127 thousand years (with range 108 to 144 thousand years). Speleothems crystallized in the time of climatic optimum of the last interglacial period (Eemian) corresponding to the marine isotope stage (MIS) 5e. Clastic sediments from excavations in the area At Crocodile show normal paleomagnetic polarity in all samples with nearly recent magnetic field directions. Studied sediments cover block of hydrothermal speleothems fallen from the wall and therefore they must be younger than 108 thousand years.
Magnetostratigraphic investigation of volcanic complex Úhošť hill(Doupovské hory Mts.)
Schnabl, Petr ; Cajz, Vladimír ; Chadima, Martin ; Rapprich, V. ; Šlechta, Stanislav ; Pruner, Petr
A detailed magnetostratigraphic study was carried out at the locality of Úhošť near Kadaň on the NE margin of the Doupovské hory volcanic complex. The majority of the samples had small viscous component that was possible demagnetized in the range 1 to 5mT or below 100°C. The primary components were pointing to the origin and were mostly interpreted in the range between 10 and 100mT or 100 to 560°C. The mean declination from all localities is 11.5 deg and inclination 53.9 deg. The parameter alpha 95 ranges between 2 and 10 degree. It's mean all lava flows has normal polarity. The major task is why all 13 localities have normal polarity although in the time range between the first and last volcanic event are several normal and reverse polarity periods.
Aplication of environmental magnetic methods in sedimentary rock research deposited in the Ochozská Cave (Moravian Karst)
Kadlec, Jaroslav ; Šlechta, Stanislav
V Ochozské jeskyni (Moravský kras) byly detailně ovzorkovány dva profily jeskynními sedimenty pro účely environmentálně magnetických analýz.
Výzkum sedimentárních výplní vybraných jeskyní na Slovensku
Bosák, Pavel ; Pruner, Petr ; Bella, P. ; Hercman, H. ; Hochmuth, Z. ; Kicinska, D. ; Šlechta, Stanislav ; Schnabl, Petr
Pokračující paleomagnetický výzkum sedimentárních profilů vybraných jeskyní na Slovensku doplnil významné předběžné výsledky předchozího výzkumu, které mnohdy změnily dosavadní představy o časovém zařazení speleogenetického procesu, etapovitosti vývoje jeskynních soustav a rozvoje reliéfu a říčních terasových systémů na Slovensku, jakož i vazeb jeskynních úrovní na v současnosti zachované morfologické tvary. Výsledky výzkumů byly publikovány v předběžných sděleních a původních pracích.

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