Temat: petrografia - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Petrographical analysis of Warthian fluvioglacial gravels as a tool to trace the source area – a case study from central Poland
Autorzy:: Górska-Zabielska, M.
Wachecka-Kotkowska, L.
Powiązania:: https://bibliotekanauki.pl/articles/94704.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: gravel petrography
indicator erratics
fluvioglacial deposits
Warthian stadial
central Poland
żwirowa petrografia
eratyki przewodnie
osady fluwioglacjalne
centralna Polska
Opis:: The petrographical features of the medium- and coarse-grained gravels (4-10 mm and 20-60 mm, respectively) of weathered and fresh (unweathered) deposits indicate, in combination with so-called indicator and statistical erratics, that two glacial lobes joined in the borderland of the Polish Lowlands and Uplands. Lower Palaeozoic limestones become less frequent in the finer gravel fraction, whereas crystalline rocks and flints become more frequent. The petrographical analysis of the coarser gravel fraction indicates that the ice sheet advanced from the NE to NNW (the Widawka lobe) and from the NE to ENE (the Rawka, Pilica and Luciąża lobes). The source areas of the gravel deposited by the Warthian ice sheet were magmatic and sedimentary areas of both the Baltic and the SE Sweden basins.
Źródło:: Geologos; 2014, 20, 3; 183-199
1426-8981
2080-6574
Pojawia się w:: Geologos
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Gierałtów versus Śnieżnik gneisses - what is the real difference?
Autorzy:: Redlińska-Marczyńska, Aleksandra
Powiązania:: https://bibliotekanauki.pl/articles/94442.pdf
Data publikacji:: 2011
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: Śnieżnik gneiss
Gierałtów gneiss
structural analysis
petrography
West Sudetes
Polska
Śnieżnik
gnejs
Gierałtów
analiza strukturalna
petrografia
Sudety zachodnie
Polska
Opis:: Structural and petrographic study applied to the gneisses from the eastern part of the Orlica-Śnieżnik Dome, indicate that two different types of gneiss are present. The Śnieżnik gneisses are porphyrithic granites, constricted and sheared into L-S tectonites, most commonly with augens; the Gierałtów gneisses are sheared migmatites, porphyroblastic gneisses and banded gneisses, with two sets of metamorphic foliation, intrafolial folds and lensoid leucosome aggregates or metamorphic porphyroblasts. Both lithologies were later zonally sheared and transformed into more or less deformationally advanced mylonites, difficult to be distinguished from one of the two types. Identification of the Śnieżnik and Gierałtów gneisses is possible only between zones of the late (Variscan) shearing, in which the original, pre-kinematic structures are preserved.
Źródło:: Geologos; 2011, 17, 2; 71-96
1426-8981
2080-6574
Pojawia się w:: Geologos
Dostawca treści:: Biblioteka Nauki

Artykuł

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