科研之友
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摘要
The Niestachow profile is located in the southwestern part of the Holy Cross Mountains and exposes lower Ludlovian greywacke sediments of the Niewachlow Beds that occur above graptolitic claystones of the Pragowiec Beds. Within the sequence of lithologically diversified Niewachlow Beds, more than 400 m thick, 11 characteristic lithologic complexes were identified. The lower and upper parts of the Niewachlow Beds comprise fine- and medium-grained greywacke sandstones with mudstone interbeds, whereas the middle part contains coarse-grained greywacke sandstones and conglomerates. The sediments were transported by "turbiditic currents" from the southwest. Petrographic examination of the upper part of the Pragowiec Beds and the Niewachlow Beds indicates that the greywacke conglomerates and sandstones of the Niewachlow Beds are composed primarily of volcanic and sedimentary lithoclasts, with subordinate metamorphic and scarce plutonic lithoclasts. The sandstones and conglomerates were derived from an orogen containing sandstones and mudstones as well as from the magmatic rocks of a continental volcanic arc, characterized by acidic-intermediate volcanism.
- 出版日期2016
