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Conferences & Meetings XIII All-Russian conference on thermobarogeochemistry in conjunction with IV APIFIS symposium
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Alpine metamorphic fluids in syn-tectonic siderite-polymetallic and quartz-stibnite veins in low-grade Variscan basement of the Gemeric unit, Slovakia

RMS-DPI code:  2008-1-109-1
Scientific session:  Fluid regime of hydrothermal ore-forming systems
Author listing:  Hurai V., Chovan M., Huraiová M.
Principal author:  Hurai Vratislav
Language:  English
Abstract - Summary 
(short description):
Low-grade Variscan basement of the Gemeric tectonic unit of the Western Carpathians contains hydrothermal veins distributed parallel to regional Cretaceous cleavage fabrics. The vein mineralization formed during successive fuchsite, siderite-barite, quartz-tourmaline, quartz-sulphide, and cinnabar stages divided by inter-mineralization tectonics.
Medium salinity (17-25 wt% total), high density NaCl-KCl-CaCl2-H2O inclusions in early siderite were trapped at temperatures between 150-300C. A wider range of salinities (5-35 wt%, relative to H2O) was detected in minerals of the quartz-tourmaline and quartz-sulphide stages. High density gases CO2-rich (N2, CH4) and essentially pure N2, fluxed the hydrothermal system during crustallization of barite and the superimposed stages.
Siderite crystallized 6-12 km deep at thermal gradients between 20 and 40C/km, as constrained by fluid inclusion isochores and vertical oxygen isotope gradients. Greater depths (possibly up to 18 km) and lower thermal gradients (12-20 C/km) during the superimposed stages indicate progressive crustal thickening during the vein evolution. Oxygen isotope ratios in the ore-forming fluids (4-11 V-SMOW) reflect various fluid/rock ratios in rock-buffered hydrothermal systems. U-Pb-Th, 40Ar/39Ar, and K/Ar geochronology corroborated crystallisation coincidental with the Lower Cretaceous thrusting, and a Late Cretaceous sinistral transpressive shearing and extension.
 
Date of presentation:  22/09/2008
Time of presentation:  16-00
 
RMS-DPI code:  2008-1-109-1
Proceeedings volume 
in the RMS catalogue:
 
Proceedings of XIII International conference on thermobarogeochemistry and IVth APIFIS symposium. Volume 2.
Pages:  160-161
File of proceedings 
(PDF): 
 60 K
Status:  printed
Recieved:  11/03/2008
Accepted:  28/06/2008
Published on-line:  20/03/2009
Permanent address of publication:  http://www.minsoc.ru/2008-1-109-1/
Contact author(s):  Hurai, Vratislav
 

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