engleski

Dickite and kaolinite in the Pb-Zn-Ag sulphide deposits of northern Kosovo (Trepča and Crnac)

Alteration minerals dickite and kaolinite were detected in two hydrothermal Pb-Zn-Ag sulphide deposits in the northern Kosovo region.Dickite is associated with skarn mineralization in the Trepča (Stari Trg) deposit and kaolinite occurs in vein sulphide parageneses in the Crnac deposit. Mineralogical characteristics of dickite and kaolinite were determined by X-ray powder diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM) with EDS detector. Fluid -inclusion microthermometry and ionic chromatography of leachates provided information on the P-T-X conditions of the genesis of dickite at Trepča.It was formed at temperatures between 290 and 330º C and pressures between 12 and 60 MPa from a fluid with salinity in the range 6-8.5 wt.% NaCl eq. and pH <5.5. Kaolinite was deposited from a fluid with minimum temperatures between 210 and 250º C, minimum pressure of 1.7 to 3.7 MPa, and salinity between 4.6 and 5.1 wt.% NaCl eq. Both dickite and kaolinite are related to the acidic premineralization phase in the deposits.

alteration ; dickite ; kaolinite ; hydrothermal ; Pb-Zn-Ag deposits ; Trepča ; Crnac ; Kosovo ; Dinarides

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