Sediments of the Hradiště Formation and bodies of the teschenite rock association in the profile of the Kopřivnička Stream, south of Kopřivnice

Geoscience Research Reports 57, 2024, pages 77–87

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Published online: 2024-11-11

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Abstract

The rocks of the teschenite association form smaller scattered occurrences in the upper part of the Hradiště Formation of the Silesian Unit. The teschenite association represents a relatively heterogeneous group of ultrabasic to intermediate igneous rocks with variable amount of felsic and mafic minerals. The age of the igneous rocks corresponds to the Berriasian–Barremian.

Three outcrops of the Hradiště Formation with igneous intrusions has been studied in the bed of the Kopřivnička Stream and its tributaries, south of the Town of Kopřivnice (Fig. 1). The area of Červený kámen, Pískovna and Holý vrch elevations is mainly formed by the Baška Facies (calcareous sandstones and conglomerates) of the Silesian Unit.

The KOP5 section was studied in more detail (Fig. 2). In the section, contact metamorphosed sediments were found both in the footwall and in the hanging wall of a magmatic rock, which therefore represents an intrusive body. In the contact metamorphosed sediments, recrystallization of carbonates was observed (Fig. 3c), resulting in impure sandy marbles, which are usually dark in colour. Igneous rock is accompanied by a mottled and banded shale. The volcanic intrusive rock and the sandy marble layer approx. 1–2 m above it show a very high content of potassium feldspar (mainly sanidine). The explanation of such a high potassium feldspar accumulation in the sediments is equivocal. According to SEM observations, the potassium feldspar is primarily of clastic origin. However, its formation by metasomatic replacement of plagioclase cannot be ruled out. Based on the structure and mineral assemblage, the igneous rock from the studied profile can be classified as altered alkaline lamprophyre, i.e. fourchite (olivine-free monchiquite).

Well-preserved dinoflagellate cysts Aptea anaphrissa, Circulodinium distinctum, Cribroperidinium orthoceras, Kiokansium polypes, Odontochitina operculata, Oligosphaeridium poculum, Prolixosphaeridium parvispinum, Subtilisphaera perlucida were retrieved from the associated claystones. According to the determined dinoflagellate, sediments of the Hradiště Formation in the Kopřivnička stream are of the Upper Barremian to the Lower Aptian age. The organic facies corresponds to a dysoxic environment in the deeper shelf (palynomorphs are dominated by dinoflagellates). Most of the samples are thermally affected by the associated volcanic intrusion.

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