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Research Paper |
a and Crnac)
1,*
o
tari
1
1
3
4
1 Faculty of Science, Horvatovac bb,
HR-10000 Zagreb, Croatia, 2
Montanuniversität Leoben, Peter-Tunner-Straße 5, 8700 Leoben,
Austria, 3 Ru
er
Bo
kovi
Institute, Bijeni
ka 54, P.O.B. 180, HR-10000
Zagreb, Croatia, and 4 Geotechnical
Faculty Vara
din, Hallerova aleja 7, HR-42000 Vara
din,
Croatia
* E-mail: sabina.strmic{at}inet.hr
(Received 25 March 2008; revised 2 July 2008)
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 Trep
a (Stari Trg) deposit
and kaolinite occurs in vein sulphide parageneses in the Crnac deposit. The
mineralogical characteristics of dickite and kaolinite were determined by
X-ray powder diffraction, Raman spectroscopy and scanning electron microscopy
with EDS detector. Fluid-inclusion microthermometry and ion chromatography of
leachates provided information on the P-T-X conditions of the genesis
of dickite at Trep
a. It was formed at temperatures between 290 and
330°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 250°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 pre-mineralization phase
in the deposits.
KEYWORDS: alteration, dickite, kaolinite, hydrothermal, Pb-Zn-Ag deposits, Trep
a, Crnac, Kosovo, Dinarides
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