Natura Croatica, Vol. 3 No. 1, 1994.
Izvorni znanstveni članak
Pyritized bauxites from Minjera, Istria, Croatia
Boris Šinkovec
; Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, Zagreb, Croatia
Krešimir Sakač
; Croatian Natural History Museum, Demetrova 1, Zagreb, Croatia
Goran Durn
; Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, Zagreb, Croatia
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 bauxite 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 accompanied by diasporization.
Ključne riječi
pyritized bauxite; diaspore; Paleogene; old bauxite mining; Minjera; Istria
Hrčak ID:
307250
URI
Datum izdavanja:
29.6.1994.
Posjeta: 391 *