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Conferences & Meetings XIII All-Russian conference on thermobarogeochemistry in conjunction with IV APIFIS symposium
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Chemical composition of ore fluids depositing high-temperature quartz in the Kroushev Dol Pb-Zn deposit, Madan district, Bulgaria

RMS-DPI code:  2008-1-82-0
Scientific session:  Fluid regime of hydrothermal ore-forming systems
Author listing:  Kotseva B.G., Piperov N.B., Bonev I.K., Driesner T., Guillong M., Heinrich C.A., Plotinskaya O.Yu.
Principal author:  Bonev Ivan K.
Language:  Russian
Abstract - Summary 
(short description):
Kroushev Dol is one of the important Pb-Zn ore deposits in the Madan ore district. The main subvertical ore vein, 1 to 3 m wide, is embedded in gneissic rocks and shows clear vertical zonation. The rich galena-sphalerite ores, formed in the upper levels (1100-650 m) under boiling conditions, are followed in dept (600-450 m) by a zone of barren quartz. Metasomatic marble hosted ore beds occur deeply (450-400 m). A long-prismatic crystal of barren quartz from the intermediate ore-free zone was studied in several cross and longitudinal plane polished sections. Total salinity of 4.0÷9.1 wt % NaCl eqv. was established by microcryometry. Homogenization temperatures range 350÷312C (mode 340C). The concentrations of 30 elements were determined by LA-ICP-MS in single fluid inclusions in several cross and longitudinal plane polished sections from the quartz crystal studied. The mol ratios are in the ranges: K/Na 0.053÷0.22; Ca/Na 0.016÷0.065; Mg/Na 0.002÷0.009 and Mn/Na 0.001÷0.010. Mn is a typomorphic element in the fluids, closely related to the pre-ore pyroxene skarns. Boron was also found (170 ppm). The ore elements concentrations are (mean values, ppm): Pb 29, Zn 70, Cu 16, As 34. Bi (5 ppm) and Sb (23 ppm) found systematically also in the galena crystals of the deposit were also detected. Some fluctuations and evolution of the chemical composition as well as some other features of fluid inclusions in radial and longitudinal positions in the crystal were established.
 
Date of presentation:  22/09/2008
 
RMS-DPI code:  2008-1-82-0
Proceeedings volume 
in the RMS catalogue:
 
Proceedings of XIII International conference on thermobarogeochemistry and IVth APIFIS symposium. Volume 2.
Pages:  56-59
File of proceedings 
(PDF): 
 145 K
Status:  printed
Recieved:  30/03/2008
Accepted:  28/06/2008
Published on-line:  19/02/2009
Permanent address of publication:  http://www.minsoc.ru/2008-1-82-0/
Contact author(s):  Bonev, Ivan K.
 

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