Bulletin Mineralogie Petrologie

Vlasáč Jozef, Ferenc Štefan, Mikuš Tomáš, Polák Luboš, Luptáková Jarmila, Biroň Adrián

Volume 26, issue 2 (2018), pages 176-187

copper mineralization, sulphides, basalts, Permian, Malužiná Formation, Hronicum Unit, Slovak republic

The aim of this paper is to clarify the mineralogical and genetic aspects of the copper ore occurrence hosted in the paleobasalts of the Hronicum unit at the Banská Bytrica-Lazina locality, and its comparison with similar occurrences in the same geological environments in Slovakia (Kozie Chrbty Mts., Malé Karpaty Mts.). The two main mineral associations were distinguished at the Lazina occurrence. The first one is chalcopyrite-pyrite association which occurs with quartz-calcite mineralization in the tectonic breccia of paleobasalts. It is represented mainly by pyrite I and II and chalcopyrite. Average crystallochemical formula of pyrite I is corresponding to the Fe_0.99S_2.00. Remarkable is pyrite II, which forms colloform aggregates which are replaced by chalcopyrite to form Cu-rich pyrite (up to 0.48 apfu). Beside copper pyrite II contains elevated amount of Co (up to 0.02 apfu), Pb (up to 0.01 apfu) and As (up to 0.01 apfu). Second is the younger bornite-chalcopyrite mineral association, which forms thin veins up to 5 cm on the border of quartz-calcite veins with host rock. This association consists mainly of chalcopyrite and bornite with increased amount of Cu-S supergene minerals (djurleite, anilite, spionkopite and yarrowite). Chemical composition of chalcopyrite can be expressed with empirical formula Cu_1.01Fe_1.00S_2.00, bornite formula is: Cu_5.01Fe_1.01S_3.98. Often, but in small quantities, galena with average empirical formula Pb_0.95Fe_0.07S_0.98 is also present in this association. In the one case, greenockite-like mineral phase with formula (Cd_0.89Fe_0.07)_∑0.96S_1.04 was identified. Its origin is probably related to the evolution of primary mineralization. Chalcopyrite and bornite are often replaced by minerals of Cu-S system. Very common is djurleite with average empirical formula (Cu_30.76Ag_0.05Bi_0.03Fe_0.03Cd_0.01Pb_0.01)_∑30.88(S_16.10Se_0.02)_∑16.12. Chemical composition of anilite can be expressed by the empirical formula (Cu_6.64Fe_0.31Ag_0.01Bi_0.01)_∑6.97S_4.03. Intermediary phase between spionkopite and yarrowite with empirical formula (Cu_8.93Fe_0.31Ag_0.03Bi_0.01)_∑9.29S_7.71 was also identified. Separated epidote-quartz-carbonate mineralization also occurs at the Lazina locality.

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