A.Yu. Mashyrova, ERRATICS OF VOLCANITES FROM THE BALTIC COAST OF POLAND AND THEIR SOURCE AREAS ON THE FENNOSCANDIAN SHIELD
https://doi.org/10.15407/mineraljournal.47.02.053
UDC 55(1)+552.3
ERRATICS OF VOLCANITES FROM THE BALTIC COAST OF POLAND
AND THEIR SOURCE AREAS ON THE FENNOSCANDIAN SHIELD
A.Yu. Mashyrova 1, 2, Bachelor, Researcher Fellow
E-mail: mashanya11.11.11@gmail.com; orcid: 0009-0000-7439-3335
O.V. Mytrokhyn 1, 2, DrSc (Geology), Professor
E-mail: mitrokhin.a.v@ukr.net; orcid: 0000-0001-6269-0092
L.V. Shumlyanskyy 3–5, DrSc (Geology), Professor
E-mail: lshumlyanskyy@yahoo.com; orcid: 0000-0002-6775-4419
T.G. Kalinichenko 3, 6, MSc, Junior Research Fellow, PhD student
E-mail: tetiana.kalinichenko@us.edu.pl; orcid: 0000-0003-3869-4063
1 Taras Shevchenko National University of Kyiv
90, Vasylkivska Str., Kyiv, Ukraine, 03022
2 Institute of Geological Sciences of the National Academy of Sciences of Ukraine
55-b, Olesya Honchara Str., Kyiv, Ukraine, 01054
3 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
4 Institute of Geological Sciences of the Polish Academy of Sciences, Krakow, Poland
5 Curtin University, Perth, Australia
6 Institute of the Earth Sciences, University of Silesia in Katowice
60, Będzińska Str., Sosnowiec, Poland, 41-200
Language: Ukrainian
Mineralogical journal 2025, 47 (2): 53-69
Abstract: Holocene glacial deposits in northern Poland contain numerous erratics of magmatic rocks transported from the Fennoscandian Shield during the Weichselian glaciation. In addition to the dominant granitoids, more exotic volcanic rocks are also found among the erratics. The authors studied erratics of volcanic rocks from the Międzyzdroje — Międzywodzie area to determine their original source area from which the clastic material entered to the glacial deposits in the north-western Poland. Petrographic and geochemical studies revealed that the most informative erratics include hydrothermally altered amygdaloidal basalts, deformed metarhyolites, crystaloclastic tuffs of dacite-trachydacite composition, coarse-porphyritic rhyolites, and trachydacite ignimbrites. It was determined that the studied erratics originated from at least four volcanic provinces located in Sweden and Finland, at distances of 300 to 800 km north of their current position in the glacial deposits. The closest volcanic province to Międzyzdroje — Międzywodzie is Proterozoic volcanic province of Ostsmåland in southeastern Sweden, which is the source of the deformed metarhyolite erratics. In contrast, the source area for erratics of the amygdaloidal basalts and crystaloclastic tuffs may lie on the floor of the Baltic Sea, north of Gotland Island. An erratic of coarse-porphyritic rhyolite from Międzyzdroje was transported from the area of Hammarudda subvolcanic complex in the western Åland Islands of Finland. The furthest one is Proterozoic volcanic province of Dalarna in central Sweden, where ignimbrites analogous to the erratic from Międzywodzie are known.
Keywords: moraine, erratic boulders, Scandinavian Ice Sheet.
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