Papp Gábor - Szakáll Sándor - Weiszburg Tamás szerk.: Az erdőbényei Mulató-hegy ásványai (Topographia Mineralogica Hungariae 1. Miskolc, 1993)

Az erdőbényei Mulató-hegy üregkitöltő ásványtársulásának általános jellemzése (Szakáll Sándor)

Mineral paragenesis and succession of the cavity-filling minerals of Mulató Hill, Erdőbénye (NE Hungary) by Szakáll, S. The laccolith of the Mulató Hill was formed by a volatile-rich magma, producing a lot of amygdaloids. The greater amygdaloids (exceeding 20-30 cm in diameter) can be found in the black rock variety. The first mineral products of the amygdaloids, a pneumatolytic paragenesis, comprise many species but the crystals are usually small (below 1 mm). The dominant mineral is tridymite, accessories are quartz-I, hornblende, magnetite, ilmenite, feldspars, apatite, cristobalite. The second phase is represented by hydrothermal mineral formation. The fluids decomposed a part of the rock forming silicates and produced several generations of carbonate and clay minerals (siderite, manganoan siderite, calcian manganoan siderite, calcite, manganoan calcite, saponite, talc- and glauconite-like minerals). Silica minerals (in the succession opal, chalcedony, quartzin and quartz-II) dominate in the late hydrothermal stage. Accessories are marcasite, cassiterite, barite, gypsum, sylvite. During secondary processes goethite, manganoan goethite, manganese oxide and hydroxide minerals and gypsum formed (Fig. 1). There is a spatial difference in the paragenesis. According to Kákay Szabó (1983) the eastern part of the laccolith which was only slightly covered ("open system") shows a silica-rich paragenesis, whereas in the more covered western part ("closed system") carbonate and clay minerals are abundant. We observed this difference in vertical sense: silica minerals are abundant in the upper part, carbonate and clay minerals in the lower part of the quarry. A szerző címe —

Address of the author: dr. Szakáll Sándor Herman Ottó Múzeum Természettudományi Múzeuma 3505 Miskolc, Kossuth Lajos u. 13.