Petrographical analysis of Warthian fluvioglacial gravels as a tool to trace the source area – a case study from central Poland
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Date
2014-09
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Publisher
Instytut Geologii UAM
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Abstract
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.
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Keywords
gravel petrography, indicator erratics, fluvioglacial deposits, Warthian stadial, central Poland
Citation
Geologos, 2014, 20, 3, s. 183-199
ISBN
978-83-232187-4-6