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Somani, R. L.
- Origin and Evolution of Hydrothermal Fluids Associated with Granitoid-Hosted Tungsten Mineralization at Degana, Rajasthan
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Authors
Affiliations
1 Department of Geology, University of Rajasthan, Jaipur, IN
2 Department of Geology, University of Jammu, Jammu, IN
1 Department of Geology, University of Rajasthan, Jaipur, IN
2 Department of Geology, University of Jammu, Jammu, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 6 (2000), Pagination: 661-671Abstract
The Degana tungsten deposit is found genetically and spatially related to the post-Delhi granite. Hydrothermal fluids associated with this granitic magmatism have evolved in three stages. Early greisenization stage took place in the temperature range 480°-260°C. Brecciation followed by boiling and emplacement of quartz sheets responsible for most of the wolframite mineralization occurred in the temperature range of 270°-350°C. In the last stage, addition of meteoric water took place in the temperature range of 130°-260°C. Salinity of mineralizing hydrothermal fluids ranges fiom 67-9 eq. wt % NaCI. Evidence of fluid boiling suggests a depth of mineralization at 600-1250 m, consistent with a range of hydrostatic pressure for about 60-300 bars.Keywords
Hydrothermal Fluids, Fluid Inclusions, Granitic Magmatism, Tungsten Mineralization, Degana, Rajasthan.
- Evolution of Tin-Tungsten and Copper Bearing Hydrothermal Solutions Associated with Tosham Igneous Complex, Tosham, Bhiwani District, Haryana: A Fluid Inclusion Study
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Authors
Affiliations
1 Department of Geology, University of Rajasthan, Jaipur - 302 004, IN
1 Department of Geology, University of Rajasthan, Jaipur - 302 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 3 (2006), Pagination: 379-386Abstract
The Tosham granite/Rhyolite is associated with tin-Tungsten and copper mineralization. Tin-Tungsten and copper mineralization at the Tosham hill resulted from hydrothermal fluids of high to low salinity that were active over a temperature range of 150° to 450°C. Within this period, records of three stages of fluid activity were preserved in fluid inclusions. The first stage is characterized by high temperature (300° to 450°C) and high salinity (>37 wt% NaCl) fluids. In the second stage fluid temperature ranges 260° to 380°C and salinity ranges 12 to 14 wt% NaCl; these hydrothermal fluid is related to a major precipitation of ore minerals during this stage. Further, hydrothermal fluids cooled down at the last stage of fluid evolution in temperature range of 150° to 190°C and salinity range of 10.5 to 16 wt% NaCl. The associated sulphides were deposited in the last event.Keywords
Fluid Inclusions, Granite, Rhyolite, Sn-W-Cu deposit, Tosham, Haryana.- Genesis of Granite Hosted Tungsten Mineralization at Balda, Rajasthan: Constrains from Granite Geochemistry and Fluid Inclusions
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Authors
Affiliations
1 Department of Geology, University of Rajasthan, Jaipur - 302 004, IN
1 Department of Geology, University of Rajasthan, Jaipur - 302 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 2 (2006), Pagination: 239-250Abstract
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.