Abstract
In this study two small, but genetically very interesting iron carbonate deposits Macje Jame and Vranjski Potok, south west of Busovaca (MBSM), located in the pre-Devonian metamorphic complex were investigated in detail. The analyses of the main chemical components, trace elements, REE, isotope composition of C, O, S, 87Sr/86Sr ratio of rhyolite, plot of REE normalized to CI chondrites and a microscopic study of thin and polished sections were performed. Three mineralization phases were identified: the oldest is the main phase (90-95 wt %) with Fe (Ca, Mg, Mn) carbonates (siderite, ankerite, Fe-dolomite) as the predominant minerals whereas magnetite, hematite, albite, allanite, pyrite I, quartz I represent subordinate minerals. The second phase is the pneumatolytic-kathathermal phase (5-10 wt %) characterized by pyrrhotite relicts, pyrite II, quartz II, arsenopyrite and some supposed accessory minerals such as cassiterite, wolframite, gersdorffite, columbite. The youngest is the katha-mezo-epithermal-hydatogene phase (<1 wt %) which gave quartz III-chalcedony as gangue minerals and marmatite, chalcopyrite, boulangerite, gel-pyrite-marcasite, sphalerite, enargite, tetrahedrite, galena, cosalite, bismuth and sternbergite as ore minerals. Almost an identical paragenesis has been found in the oldest ore deposit of the Gemericum Paleozoic metamorphic complex (RADVANEC and BARTALSKY, 1987).The first and second mineralization phase of both ore deposits formed in the Carboniferous from metamorphogeno-hydrothermal fluids generated from S-granitoid magmatic rocks and their protoliths. This claim is strongly supported by very similar REE and their interior disposition between these deposits and metarhyolites as well as by the obtained values of strontium ratios. The third, youngest phase is the product of a very weak overprint of the Late Variscan (290-260 Ma and in the Upper Permian-Lower Triassic (260-240 Ma) time) hydrothermal activity.
Highlights
The Busovača region with the Mačje Jame and Vranjski Potok ore deposits is situated in the north-eastern part of the Mid-Bosnian Schist Mountains (MBSMts) (Fig. 1)
MAJER et al, (1991) carried out a phase analysis of pyrophyllite, white micas, chlorite, chloritoid and amphibole from the metamorphic rocks in the Busovača-FojnicaKiseljak-Kreševo region. These analyses demonstrated very low to low grade metamorphism of rocks in the SW part of the MBSM, and the local presence of barroisitic amphibole in the NE part of this territory indicating higher P - T conditions
The Mačje Jame and Vranjski Potok iron ore occurrences situated in the north-eastern part of the MBSM, are the earliest postorogenic ore deposits in the MBSM
Summary
The Busovača region with the Mačje Jame and Vranjski Potok ore deposits is situated in the north-eastern part of the Mid-Bosnian Schist Mountains (MBSMts) (Fig. 1). It is the oldest part of MBSMts. The Palaeozoic complex area (3000 km2) is delimited by the deep first order Busovača Fault on the north-eastern side, by the Kozica river on the south-eastern and southern sides, by the Krušćica river on the southwestern side and by the Lašva river on the north side. Geologia Croatica 67/2 mountain ridge (+843 m) locality, SW of the village of Tisovac and at the locality of Gornje Brizove Stijene, 6.5 km SE to the town of Busovača These small ore occurrences are characterized by siderite and ankerite as the main minerals, with subordinate magnetite, haematite, albite, pyrite, quartz and Fe, As, Cu, Zn, Pb and Sb sulphides and sulphosalts. Layers of quartz and mica-schists, mm-cm thick, are interbedded in the faulted host rock
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
