Provenienční studie eocenních sedimentů obsahujících jantar z belovežského souvrství u obce Študlov
Roč.32,č.1-2(2025)
This study presents the mineralogical and textural characteristics of deposits of turbidity currents containing amber from the Beloveža Formation, located in the Bystrica Unit near the village of Študlov. Based on optical and microprobe analyses, the translucent heavy minerals present in the sandstone consist of 40% tourmaline, 25% zircon, and 15% garnet. Other heavy minerals are found in minor quantities, including spinel, staurolite, amphibole, apatite, members of the epidote group, kyanite, rutile, monazite, and barite. The chemical composition of the garnet has a range from pyrope to grossular-rich grains.
Dominated almandine-rich garnets with a higher content of the pyrope component (Alm59–73 Prp21–38 Grs0–7 Sps2 Adr0–2), which is typical for most Cretaceous and Paleogene sediments in the Magura Sedimentary Basin. Additionally, the chemical composition of the spinelides suggests a contribution of materials from supra-subduction geotectonic settings and crustal metamorphic rocks. Tourmaline is derived from metamorphosed sediments and peraluminous granites, typical of the continental crust.
The chemical composition of the translucent heavy minerals in the studied sandstone sample indicates that the Southern Magura Ridge is the primary source of the sedimentary material. Chromium-rich spinels and pyrope-rich garnets indicate the presence of mafic to ultramafic, supra-subduction, or mantle rocks in the source region. The presence of coal and amber indicates the likely contribution of materials from forest-covered regions located to the south, specifically in the exposed areas of the active Western Carpathian accretionary wedge.
Magura Basin, Gravity flow deposits, Sandstone, Heavy minerals, Mineral chemistry
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