Open Access
Subscription Access
Open Access
Subscription Access
Genesis of Granite Hosted Tungsten Mineralization at Balda, Rajasthan: Constrains from Granite Geochemistry and Fluid Inclusions
Subscribe/Renew Journal
The Balda Granite is spatially associated with tungsten mineralization that owes its genesis to the associated magmatic hydrothemal system. The wolfrarnite mineralization is confined to quartz veins and greisenized pegmatites located along the shear zones in the Balda Granite. Balda Granite is intruded into the Erinpura Granite. Balda Granite is characterized by high SiO2,K2O,W,Sn,Rb,Nb, Rb/Sr and low TiO2,, Ba/Rb, and K/Rb ratio indicating its highly fractionated nature and as a result was enriched in aqueous volatile constituents.
Fluid inclusion studies indicate that hydrothermal activity involved three types of fluids. A high salinity fluid 45- 58 eq.wt.% NaCl of probably magmatic origin and homogenization temperature up to 430°C was associated with greisenization of granite. A Iow salinity (5.4 to 9.0 eq.wt.% NaCl) carbonic fluids containing variable amount of CO2 with temperature of homogenization between 255° to 355°C was associated with most of the wolframite mineralization in shear zones in the granite. This lower salinity carbonic fluid was derived from mixing of fluids. Third low salinity aqueous fluid (4.92to 12.2 eq.wt.% NaCI) having homogenization temperature between 360° to 170°C was associated with deposition of fluorite and possibly derived from meteoric sources. B and F were introduced and Na was depleted during hydrothermal alterations. The presence of tourmaline and fluorite suggest that various B and F complexes partition W from melt phase. W was transported mainly as H2WO°4, HWP4, and W042- and alkali tungustate ion complexes. Various P, Cl complexes and CO2 also favor W transportation and precipitation in many ways.Keywords
Fluid inclusions, Tungsten, Granite, Geochemistry, Balda, Siroh district, Rajasthan.
Subscription
Login to verify subscription
User
Font Size
Information
Abstract Views: 172
PDF Views: 2