Naslov
Pyritized bauxites from Minjera, Istria, Croatia

Autori
Šinkovec, Boris ; Sakač, Krešimir ; Durn, Goran

Izvornik
Natura Croatica : periodicum Musei historiae naturalis Croatici (1330-0520) 3 (1994), 1; 41-65

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

Ključne riječi
pyritized bauxite; diaspore; Paleogene; old bauxite mining; Minjera; Istria

Sažetak
Pyritized bauxite was exploited in the valley of Mirna river in Istria already 400 years ago. It was used as a raw material for production of vitriol and alum. The pyritized bauxite contains both pyrite and marcasite. The conditions of their formation are interpreted in terms of the pH of the micro-environment and the concentration of sulfur and iron. Two phases of pyritization of byuxite have been recognized. Sulphur from the First phase of pyritization originated from organic matter of hangingwall sediments, while during the second phase sulfur mainly originated from the sea water. Pyritization is in some places accompained by diasporization

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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