New tertiary volcanites on map sheet 02-242 Dolní Podluží

Geoscience Research Reports 33, 2000 (GRR for 1999), pages 31–33

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Abstract

New geological mapping at a scale of 1:50 000 was carried out on the sheet 02-242 Dolní Podluží (Nothern Bohemia). During this mapping done in 1998-1999, fifty new volcanic bodies have been discovered by the authors in an area covering 60 kmř. This area belongs to the western part of the Lužické hory Mountains. A very variable morphology is typical for this forrested area. These facts, together with the absence of more accurate previous maps explain such a great number of hitherto unknown volcanics. All the newly discovered volcanic bodies pertain to the Tertiary alkaline volcanites of the Bohemian Massif. Among the new volcanics phonolites and tephrites predominate, basanite, volcanic breccia and tephriphonolites follow. Other types are rare (see fig. 1). All the new volcanites represent subsurface bodies (dykes, volcanic pipes, small stocks) which have been exposed by erosion of the sediments of the Bohemian Cretaceous Basin.