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Fluid inclusion studies on barite from Hutti Gold Mines, Karnataka, India: inferences on late-stage hydrothermal fluid

DSpace at IIT Bombay

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Title Fluid inclusion studies on barite from Hutti Gold Mines, Karnataka, India: inferences on late-stage hydrothermal fluid
 
Creator NEVIN, CG
PANDALAI, HS
 
Subject eastern dharwar craton
south-india
schist belt
mineralization
deposit
canada
archean gold
barite
hutti
hydrothermal veins
 
Description Late-stage, post-gold mineralization, cavity-filling veins with barite are reported here from the Hutti gold deposit of Karnataka. Large (10-15 cm) to medium (2-5 cm) sized translucent crystals of barite studded with numerous pyrite grains commonly of 1-2 mm size occur in these veins. Monophase and biphase fluid inclusions occur in primary clusters and pseudo-secondary trails in the barite crystals. Microthermometric and laser-Raman studies show that the barite has formed from aqueous fluids of relatively high salinity (14-22 eq. wt% NaCl). Minor Raman-shift peaks of methane are observed in the vapour phase of a few biphase fluid inclusions. Assuming pressure of less than 1 kbar, trapping temperature would be less than 200 degrees C. These post-ore veins at Hutti point to a source of oxidized fluid subsequent to the phase of gold mineralization.
 
Publisher INDIAN ACAD SCIENCES
 
Date 2011-08-01T22:09:05Z
2011-12-26T12:53:31Z
2011-12-27T05:39:47Z
2011-08-01T22:09:05Z
2011-12-26T12:53:31Z
2011-12-27T05:39:47Z
2010
 
Type Article
 
Identifier CURRENT SCIENCE, 98(7), 955-962
0011-3891
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8560
http://hdl.handle.net/10054/8560
 
Language en