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Conferences & Meetings XIII All-Russian conference on thermobarogeochemistry in conjunction with IV APIFIS symposium
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Environment of ore deposition at the Korshunovskoye Fe-ore deposit, South Siberia

RMS-DPI code:  2008-1-74-0
Scientific session:  Fluid regime of hydrothermal ore-forming systems
Author listing:  Grishina S.N., Mazurov M.P., Polozov A.G.
Principal author:  Grishina Svetlana Nikolaeyvna
Language:  Russian
Abstract - Summary 
(short description):
The data on the mineral composition and crystallization conditions of magnesian skarn and magnetite ore at contacts of dolerite with rock salt in ore-bearing volcanic–tectonic structures of the Angara–Ilim type have been integrated and systematized. Optical microscopy, scanning and transmission electron microscopy, electron microprobe analysis, electron paramagnetic resonance, Raman and IR spectroscopy, and methods of microthermometry were used to study minerals and fluid inclusions. The most diverse products of metasomatic reactions are found in the vicinity of a shallow-seated magma chamber that was formed in Lower Cambrian carbonate and saliferous rocks under a screen of terrigenous sequences. Rock salt is transformed at the contact into halitite as an analogue of calciphyre. The specific features of contact-metasomatic and hydrothermal generations of halite have been established. The contact-metasomatic halite is distinguished by a fine-grained structure and the occurrence of highly saline CaCl2-bearing brine inclusions, anhydrous chloride minerals (CaCl2, nKCl.mCaCl2) and liquid CO2-inclusions. The low-temperature hydrothermal halite, which occurs in skarnified and unaltered silicate rocks and in ore, is characterized by a low salinity brine inclusions and the absence of solid inclusions. The composition and aggregative state of inclusions in halite and forsterite indicate that salt melt-solution as a product of melting and dissolution of salt was the main agent of high-temperature metasomatism. Its total salinity was not lower than 60%. The composition and microstructure of magnetite systematically change in different mineral assemblages. Magnetite is formed as a result of extraction of iron together with silicon and phosphorus from dolerite. The first generation of magnetite is represented by mixed crystals, products of exsolution in the Fe–Mg–Al–Ti–Mn–O system. The Ti content is higher at the contact of dolerite with rock salt, whereas, at the contact with dolomite, magnetite is enriched in Mg. The second generation of magnetite does not contain structural admixtures. The distribution of boron minerals and complex crystal hydrates shows that connate water of sedimentary rocks could have participated in hydrothermal metasomatic processes.
 
Date of presentation:  23/09/2008
Presentation Place:  IGEM RAS, Conference Hall
 
RMS-DPI code:  2008-1-74-0
Proceeedings volume 
in the RMS catalogue:
 
Proceedings of XIII International conference on thermobarogeochemistry and IVth APIFIS symposium. Volume 2.
Pages:  31-32
File of proceedings 
(PDF): 
 91 K
Status:  printed
Accepted:  28/06/2008
Published on-line:  19/02/2009
Permanent address of publication:  http://www.minsoc.ru/2008-1-74-0/
Contact author(s):  Grishina, Svetlana Nikolaeyvna
 

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