Naslov
Sedimentary low-manganese hematite deposits of the Bukovica area in the northwestern Mt. Petrova gora, Central Croatia

Autori
Čop, Milivoj ; Jurković, Ivan ; Slovenec, Dragutin

Izvornik
Rudarsko-geološko-naftni zbornik (0353-4529) 10 (1998); 1-24

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Middle-Permian low-manganese hematite deposits; XRD; AAS; DTA analyses; Paragenesis; Croatia

Sažetak
Middle-permian Gröden deposits crop out on the surface of 0.8 km2 in the Bukovica area in the NW part of the Petrova gora Mountain. The Bukovica Gröden deposits contains in its lowest parts 1 to 5 m (in average 2.5 m) thick hematite bed cutted in blocks by NE-SW stretching vertical, normal and reverse faults. The hematite bed is unconformably underlain by Lower Permian quartz-wackes intercalated with shales. Ore deposit is explored by 308 boreholes (10509 m) and by adits, inclines and crosscuts. From 1936 to 1941 and from 1953 to 1969 has been exploited 183 000 t of ore with (in wt %): 34.0 SiO2 ; 2.9 Al2O3 ; 59.0 Fe2O3 ; 0.15 MnO ; 0.7 CaO ; 0.4 MgO ; 0.1 P ; 0.37 S ; 1.25 I.o. ign. Proven remaining ore reserves are 250 000 t. Paragenesis major minerals are of hematite and quartz, with subordinate stable lithoclasts, muscovite (sericite) and scarce kaolinite, calcite, dolomite and barite. Iron from the Bukovica hematite ore originated by land weathering during hot climate and transported by rivers and underground waters deposited in river beds, in flood plains and in shallow sea.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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