Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Mineralogy and geology of Míšeň valley (Lužické hory Mts.)
Abstract
In the area studied, occurrences of gold, pyrope, corundum, titanite and other minerals were confirmed by geochemical prospecting. The surface of pyrope grains is heavity corroded, which indicates that some minerals from this association did not originate from igneous rocks, but from sediments. The chemical composition of pyrope shows that local garnets are almost identical to Czech garnets coming from the České středohoří Mts. or the Krkonoše Mts. As the source rock of those heavy minerals, sandstone from the base of the Upper Cretaceous was identified. Cumulative gamma activity of all rocks was measured. Phonolites and analcimites were determined as the most radioactive rocks in the area. Their radioactivity exceeds the limits for use in the building industry.
