Naslov
Lead deposits in the Zrin District of Trgovska Gora in Croatia

Autori
Jurković, Ivan ; Durn, Goran

Izvornik
Geološki vjesnik (0016-7924) 41 (1988); 317-339

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

Ključne riječi
Lead deposits; Zrin District; Trgovska Gora; Croatia

Sažetak
The paper gives a historical survey of mining operations in the Paleozoic of Trgovska Gora in Croatia, and a more detailed account of the Zrin district, with its former Zrin and Franz mines, where mining was conducted for silver-bearing galena inIllyrian and Roman times as well as in the Middle Ages. A survey of the paragenetic types of the Trgovska Gora ore occurrences is also given (a) ankerites and ankeritised limestones ; b) siderites ± quartz ± very small amounts of sulfides ; (c) cms or tens of cms of scale layered siderite-quartz deposits ± sulfides ; (d) siderite deposits with chalcopyrite ; (e) siderite deposits with Cu, Zn, Pb, Ni (Co) sulfides and sulfosalts ; (f)siderite deposits with silverbearing galena. The results of field and laboratory researches into microelements (Zn, Pb and Cu) are sown in all types of rocks and soils on 100 kms2 surface area of the paleozoic zone. It was established that there is 3 times as much Zn and Cu and twice as much Pb in the silts and shales as in the sandstones. The general ratio of the metals is Zn > Pb > Cu. In the soils there are Zn > Cu > Pb. Rocks in the vicinity of ore occurrences showno anomalies, but soils next to ore-bearing areas give anomalous values. A more detailed account is given of the microphysiography and the sequence of hypogenic minerals in the Zrin district ore occurrences: pyrite I, quartz I, siderite I, pyrite II, quartz II, sphalerite with exolutions of chalcopyrite I, chalcopyrite II, tetrahedrite I, tetrahedrite II (as exsolution in galena), mineral "T" with exsolutions of chalcopyrite III. and gersdorffite. In the hypergenic paragenesis relatively small amounts of the following were found: goethite, lepidocrocite, covellite, chalcocite, anglesite, malachite and azurite.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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