TITLE:
Fluid Inclusion Petrography and Microthermometry of Zn and Pb Deposits of Rajpura-Dariba Bethumni Belt, Udaipur District (Rajasthan), India
AUTHORS:
Juned Alam, Farhat Nasim Siddiquie
KEYWORDS:
Sphalerite, Quartz, Fluid Inclusions Petrography and Microthermometry, Rajpura
JOURNAL NAME:
International Journal of Geosciences,
Vol.6 No.3,
March
25,
2015
ABSTRACT: The Proterozoic
Aravalli-Delhi orogenic complex hosts a large number of economically important
stratabound base metal sulphide deposits. In the present work, rock samples
taken from Outcrop and Underground Mine of Sindeskar Kalan, Vedanta Group,
Rajpura Dariba-Bethumni Belt which is located at a distance of 76 kms from
Udaipur city, Rajasthan have been studied. The chief litho units of the group
which contain sulfide-bearing calc-silicate and graphite mica schist, dolomite
marble, calc-biotite schist and quartzite are identified. An attempt has also
been made to study/or hydrothermal in origin in the different types of fluid
inclusions, hosted predominately in Geothermometry viz. heating and freezing
study of entrapped palaeo-fluids (such as sedimentary and quartz host grain and
a few in sphalerites). The quartz hosts are identified with four types of fluid
inclusions, such as 1) monophase (gas/vapour), 2) gas-rich biphase, 3)
liquid-rich biphase and 4) polyphase types. The primary types of fluid
inclusions show that melting temperature of ice or depression freezing point
(DFP) (ranging from -2.5°C to -7.2°C)/(salinity ranging from 4.5 - 13.25 wt%
NaCl eq.) and temperature of homogenization into liquid phase (ranging from
+188°C to +218°C) have been measured. Data from the fluid inclusions and
salinity calculation (low salinity) reveal that rate of cooling is the important
mechanism of ore deposition in the study area.