Formation of skarns and other calc-silicate rocks from the Sudetes

Abstract

Skarny i skały skarnopodobne w Sudetach The occurrence of the calc-alumo-silicate rocks in the Polish part of the Sudetes, southwestern Poland, is characterized. The rocks can be classified into two groups: skarns and erlans. Skarns, mostly of Ca type, arc generally younger and composed ofhigh-Fe silicates. They host relatively large volumes of Fe, As and/or polymetallic ores. The formation of skarns is related to the contact-metasomatic activity of Variscan granitoids or other silicate rocks. Erlans (skarnoids, rogoviks) are predominantly older and consist of low-Fe silicates and feldspars. Their origin is due to the transformation of calcareous-marly, partly clayey sediments during the regional metamorphism.