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Conferences & Meetings XIII All-Russian conference on thermobarogeochemistry in conjunction with IV APIFIS symposium
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Physical and chemical conditions of boron minerals formation in the Dalnegorsky borosilicate deposit: fluid inclusions study

RMS-DPI code:  2008-1-79-0
Scientific session:  Fluid regime of hydrothermal ore-forming systems
Author listing:  Karas O.A., Pakhomova V.A., Karabtsov A.A., Kononov V.V.
Principal author:  Karas Olga Alexandrovna
Language:  Russian
Abstract - Summary 
(short description):
The Dalnegorsk boron deposit obviously has no genetic analogues among the known world boron deposits and that inspired many researchers to investigate its peculiarities. Despite the great amount of works devoted to this deposit, problems on its genesis and the source of boron remain unclear. Our aim is to solve them. The Dalnegorsk borosilicate deposit is developed industrially for boron and for specimens of danburite, datolite, and axinite by gemmologists and collectors. This deposit is a bed-like body of skarns extending for 3.5 km in accordance with folding. Limestone blocks are skarned, and terrigenous rocks are less skarned; the thickness of the skarned rock body reaches 540 m and it extends to a depth of 1.7 km.
Physical and chemical conditions of formation of boron minerals in the Dalnegorsk borosilicate deposit have been determined. The temperature of datolite formation is 150oC 185oC, KCl prevails in the saline system composition, but NaCl and MgCl2 are also present. The temperature of danburite formation is 270oC 280oC, NaCl, KCl and CaCl2 are present in the phase composition of the saline system. The temperature of axinate formation is 360oC 380oC, the saline system contains KCl, MgCl2 and B. The solution concentration for determined temperature of axinate homogenization is 10.1% and is equivalent to CaCl2.
 
Date of presentation:  23/09/2008
 
RMS-DPI code:  2008-1-79-0
Proceeedings volume 
in the RMS catalogue:
 
Proceedings of XIII International conference on thermobarogeochemistry and IVth APIFIS symposium. Volume 2.
Pages:  45-48
File of proceedings 
(PDF): 
 104 K
Status:  printed
Recieved:  14/03/2008
Accepted:  29/06/2008
Published on-line:  19/02/2009
Permanent address of publication:  http://www.minsoc.ru/2008-1-79-0/
Contact author(s):  Eliseeva, Olga Alexandrovna
 

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