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Porównanie sekwencji deformacji fałdowych w północnej i południowej okrywie granitoidów Karkonoszy

Gaidzik K., Żaba J.

Przegląd Geologiczny

2017

Vol. 65, nr 12

1548--1554

We applied the detailed structural analysis to 394 outcrops in the southern and northern metamorphic cover of the Karkonosze Intrusion. We recognised five generations of fold structures: F1 -poorly preserved tight intrafoliation folds; F2 - the most common generation, with the whole variety of fold geometries, W-E and WSW-ENE-oriented fold axes in the northern contact zone, and W-E and WNW-ESE-oriented fold axes in the southern contact zone; F3 - chevron folds; F4 - kinkfolds observed only in the Stara Kamienica schist belt; and F5 - wide open folds, locally transformed into monoclinal kinkfolds, probably formed during the Variscan intrusion of the Karkonosze pluton. Similarity observed in the structural style in the northern and southern contact zones prove that these lithostratigraphic units had formed a single unit - the Izera-Kowary Unit - and had undergone the same deformational stages before the Karkonosze granitoid intrusion took place.

Promieniotwórczość naturalna wybranych skał krystalicznych bloku izerskiego

Malczewski D., Sitarek A., Żaba J., Dorda J.

Przegląd Geologiczny

2005

Vol. 53, nr 3

237--244

Results of natural radioactivity of 40K, 208Tl, 212Pb, 212Bi, 214Pb, 214Bi, 228Ac and the fallout of 137Cs measured in situ in typical crystalline (both igne-ous and metamorphic) rocks of the Izera Block (Sudetes Mountains, southwestern Poland) using a portable gamma-ray spectrometry workstation are presented. The highest activity concentrations of 40K and 226Ra (238U series) were noted in laminated gneisses whereas the highest activity concentration of 228Ac (232Th series) is characteristic for Sn-bearing mica schists. The lowest activity concentrations of 40K, 228Ac and 226Ra refer to the basalts, flaser gneisses and Izera granites, respectively. The measurements carried out in the study area have shown relatively low level of 137Cs fall-out.

Ksenotym w łupkach łyszczykowych zmineralizowanych kasyterytem z pasma łupkowego Starej Kamienicy

Bobiński W., Siemiątkowski J., Starnawska E.

Przegląd Geologiczny

2004

Vol. 52, nr 1

61-63

Xenotime in mica schists with chlorite was analysed with EDS microprobe combined with scanning electron microscope JEOL JSM 35. The samples come from two boreholes (C-XI-41 and C-XII-54) drilled in the western part of Stara Kamienica Range. Xenotime crystals are of zoning and patchy character due to the changing composition of HREE elements. Xenotime is probably of hydrothermal origin which is connected with premetamorphic cassiterite and sulfide mineralization.