Russian Mineralogical Society
XIII All-Russian conference on thermobarogeochemistry in conjunction with IV APIFIS symposium
Hydrothermal fluid parameters formed gold-massive-sulfide-polymetallic deposits of West-Magnitogorsk paleoisland arc, South Urals

RMS-DPI code:  2008-1-78-0
Scientific session:  Fluid regime of hydrothermal ore-forming systems
Author listing:  Zaykov V.V., Ankusheva N.N.
Principal author:  Ankusheva Natalya Nikolaevna
Language:  Russian
Abstract - Summary 
(short description):
Results of forming conditions of hydrothermal system of sulfide-polymetallic deposits of East-Magnitogorsk paleoisland arc determination are represented in the paper. Fluid inclusion study of quartz and calcite is first carried out in these objects. Hydrothermal systems include (i) under-ore veined and disseminated ores; (ii) sulfide ores with feeder channels filled with calcite and quartz; and (iii) quartz veins in over-ore dacites and rhyolites. Fluid inclusions in calcite from feeder channels and quartz from sulfide-quartz veins cutting quartz-plagioclase rhyolites and dacites were studied. Hydrothermal fluids formed the feeder channels of the Tash-Tau deposit have a NaClMgCl2-salt composition with salinity of 56.7 wt. % of NaCl-equiv. The temperatures of homogenization are 160170 . Hydrothermal veins in dacites consist of quartz, carbonates, and epidote. As a result of fluid inclusion study it was established that NaCl and MgCl2 with salinity of 4.58 wt. % prevails in hydrothermal fluids. The temperatures of homogenization are 230280 . In the Vishnyevka deposit fluid inclusions in quartz from sulfide-quartz veins in rhyolites and altered rocks were studied. NaCl with salinity of 28 wt. % prevails in hydrothermal fluids here. Minimal temperatures of mineral formation corresponding to homogenization temperatures are 120180 . Thus, it is established that fluid source in these objects is seawater.
 
Date of presentation:  24/09/2008
Presentation Place:  IGEM RAS, Conference Hall
 
RMS-DPI code:  2008-1-78-0
Proceeedings volume 
in the RMS catalogue:
 
Proceedings of XIII International conference on thermobarogeochemistry and IVth APIFIS symposium. Volume 2.
Pages:  41-44
File of proceedings 
(PDF): 
 103 K
Status:  printed
Recieved:  13/03/2008
Accepted:  28/06/2008
Published on-line:  18/02/2009
Permanent address of publication:  http://www.minsoc.ru/2008-1-78-0/
Contact author(s):  Ankusheva, Natalia Nikolaevna

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