Pages: 207 - 216
Abstract: Sb-Au mineralization in the Mala Magura Mts. was found in the vicinity of the Chvojnica village. Mineralization occurs in quartz-carbonate veins and disseminated zones in the Variscan granitoids and highly-metamorphosed rocks. Paragenetic associations of Sb-Au mineralization are close to other deposits of this type in the Tatric tectonic unit (Male Karpaty Mts. Nizke Tatry Mts. etc.) The mineralization was formed during three stages. The pyrite-arsenopyrite-gold mineral stage is the oldest one. The arsenopyrite geothermometer gives a temperature range of 385–465 °C. Younger stages are the sphalerite-galena-tetrahedrite (2nd) and stibnite-sphalerite-sulphosalts (3rd) mineral stages. A substantial part of the sphalerite of the 2nd mineralization stage shows ”chalcopyrite disease”. Common association of pyrrhotite and native antimony observed in the 3rd mineralization stage indicates low aS2 and fO2 values of the ore-forming fluid. Furthermore, the 3rd mineralization stage comprises Fe-bearing minerals (jamesonite, pyrrhotite and berthierite), which indicate Fe-rich environment. Primary gold occurs in two generations differring in Ag content.
Keywords: Variscan basement, Sb (Pb, Zn, Cu, Fe) sulphides and sulphosalts, goldDownload PDF document