K-rich rocks and their relation to mineralization in the Mátra Mountains (North Hungary)

At the end of the 1960s scientists of the Geological Institute of the Hungarian Geological Survey described K-enrichments in different rock types exposed at surface in the Western and Central Matra Mts. At that time these K-rich rocks were not studied in detail. In the framework of a research project we indicated that the main K-bearing minerals are sanidine and orthoclase. The average K2O content of the different potassium-rich rock types reached 9.16%, whereas their K-content is 7.6%. In contrast to previous opinions no direct mineral paragenetic relationship could be established between hydrothermal ore mineralization and the formation of the K-rich rock types. K/Ar data obtained on K-rich rocks indicate that the K-rich rock types are older than the ore mineralization.