Mineralogie krupníkového tělesa v Medvědím dole u Koutů nad Desnou v Jeseníkách

Abstract

Soapstone bodies are relatively common in the Sobotín Massif in the Hrubý Jeseník Mts. (NE part of the Bohemian Massif). There was a small soapstone body found near Kouty nad Desnou in the northern spur of the Sobotín Massif composed dominately of amphibolites. The article focuses on mineralogy and petrology of this body and rocks in its surroundings (mainly hornblendite). Studied soapstone body is composed of these four types of rocks: i) talc schists with variable content of chlorite (clinochlore) and amphibole (actinolite, magnesiohornblende); ii) soapstone (mineral association talc + dolomite); iii) chlorite schist; iv) actinolite schist. Chromite is a typical accessory mineral of soapstone body rocks as well as hornblendite. This soapstone body does not show mineralogical and petrographical zonality typical for well-known soapstone bodies of the Sobotín Massif – former soapstone deposits Smrčina and Zadní Hutisko. However there is no mineralogical or petrographical difference between those deposits and studied soapstone body. Formation of the soapstone body at Kouty nad Desnou is probably connected to hydrothermal alteration of hornblendite running along shear zones.