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Conferences & Meetings XIII All-Russian conference on thermobarogeochemistry in conjunction with IV APIFIS symposium
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The role of fluids in the formation of limestones-hosted Li-rich aplites and pegmatites

RMS-DPI code:  2008-1-24-0
Scientific session:  Fluid inclusions in magmatic minerals as indicators of magmas generation conditions and evolution
Author listing:  Kuznetsova L.G., Prokofiev V.Yu.
Principal author:  Kuznetsova Lyudmila Gavrilovna
Language:  Russian
Abstract - Summary 
(short description):
The geochemical features of Li-rich granitic pegmatites and the role of fluids in their formation were investigated at some pegmatite occurrences of Sangilen area (South Siberia) enclosed in limestones. They have all the indications of primary-magmatic origin and in the main features (weekly zoned internal structure and typical mineral composition including quartz, K-feldspar, plagioclase and spodumene) are similar to the majority of the world-known Li-bearing pegmatites formed in the alumino-silicate medium. In spite of almost total lack of chemical interaction of dykes with carbonaceous host rocks in situ they show distinct signs of contamination and some other geochemical peculiarities: unusual evolutionary sequence, reduced N2O/K2O ratio. Comparison of spodumene granitoids from two pegmatitic fields (Solbelder and Husuingol), enclosed into similar host rocks (limestones), demonstrated that at the Solbelder field the contamination is stronger. To reveal the conditions of contaminated Li-rich melts crystallization microtermometric study of primary fluid inclusions and gas-chromatographic study of spodumene pegmatites was conducted. It demonstrated that rare-metal granitoids crystallized from the melts undersaturated in respect to H2O, F, and B, but in the presence of high-density fluid composed of CO2 with admixture of CH4 and N2. Granitoids of the biggest Tastyg lithium deposit were formed in more reduced conditions. More strongly contaminated spodumene pegmatites from Solbelder field were formed under higher fluid pressure (up to 5.8-6.1 kb at 6000 C) than the rare-metal pegmatites from Husuingol field (up to 3.7-4.2 kb at 600 oC). This data suggests that the degree of melt contamination depends on the activity of CO2, and it increases with fluid pressure raising.
 
Date of presentation:  22/09/2008
 
RMS-DPI code:  2008-1-24-0
Proceeedings volume 
in the RMS catalogue:
 
Proceedings of XIII International conference on thermobarogeochemistry and IVth APIFIS symposium. Volume 1.
Pages:  102-105
File of proceedings 
(PDF): 
 132 K
Status:  printed
Recieved:  29/04/2008
Accepted:  28/06/2008
Published on-line:  13/02/2009
Permanent address of publication:  http://www.minsoc.ru/2008-1-24-0/
Contact author(s):  Prokofiev, Vsevolod Yurievich
 

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