Primary natural occurrences of volcanic glass in the region of Eastern Slovakia are associated with other products of silicic (rhyolite, rhyodacite) volcanism. This Upper Badenian to Lower Pannonian volcanism was a part of the bimodal andesite/rhyolite volcanic activity. Products of the silicic volcanism occur as tuffs and pumice tuffs, reworked epiclastic volcanic rocks, rare intrusions and dominantly as extrusive domes that sometimes pass into short and thick lava flows. The volcanic glass associates with intrusive and extrusive forms of silicic volcanism and occurs in massive as well as brecciated forms (e.g. in the type locality of Merník), or as perlite (Brezina, Byšta) and perlite with obsidian (Malá Bara, Viničky). Rarely the volcanic glass can occur in explosive forms of silicic volcanism (obsidian – Hermanovce, Veľká Bara). Fragments of perlite with obsidian and rare obsidian, occurring alone, are a part of reworked rhyolite/rhyodacite tuffs, epiclastic volcanic sandstones and gravels, as well as epiclastic volcanic breccias, all occurring near the municipality of Streda nad Bodrogom. In Quaternary deposits, obsidian occurs around the Cejkov and Brehov villages.
|Number of pages||10|
|Publication status||Published - Jan 1 2018|
- Eastern Slovakia
- Evolution of Obsidian surface
- Facies position
- Sources of Obsidian
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