Badania składu głazowego moren zlodowacenia południowopolskiego

Abstract

STUDIES ON BOULDER COMPOSITION IN MORAINES OF THE SOUTH POLISH GLACIATION

Summary

Crystalline rocks found to occur in the moraines of the South Polish Glaciation have been investigated. The distribution of investigation points is shown in Fig. 1. For fractions from 2 to 10 cm quantitative ratios have been determined between the rocks that come from both the eastern and the western areas of Fennoscandinavia. In the group of the East-Fennoscandinavian rocks there are distinguished: post-orogenic granites, rocks making transitions from granites into granite porphyries, and porphyries: granite porphyry, Aland quartz porphyry, and Baltic red porphyry. As concerns the West-Fennoscandia rocks, the following kinds have been distinguished: Sala granites, Upsala granites, Stockholm granite, Siljan granite, Bornholm granite and Smaland granite, as well as porphyries: Smaland porphyries, from the Dalarna area, and Baltic porphyries, i.e. brown porphyry and syenite porphyry. In all the investigation points the rocks coming from the eastern area of Fenno-Scandinavia distinctly prevail upon the remaining ones (Table 4). This predominance can be observed irrespective of the character of the moraine under examination (arenaceous moraine, silty moraine, clay moraine, which does not show any bedding, or schistous).