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Sen, A. K.
- Fluid Inclusion Studies in Apatite of the Sung Valley Carbonatite Complex, N. E. India: Evidence of Melt-Fluid Immiscibility
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Authors
Affiliations
1 Gold Research Group, Geology Department, James Cook University, Townsville, AU
2 Department of Earth Sciences, University of Roorkee, Roorkee, IN
1 Gold Research Group, Geology Department, James Cook University, Townsville, AU
2 Department of Earth Sciences, University of Roorkee, Roorkee, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 37, No 6 (1991), Pagination: 547-559Abstract
The Sung Valley carbonatite complex of Cretaceous age has a core of serpentinized peridotite rimmed by pyroxenite. The complex is intruded by small- to medium-sized bodies of uncompahgrite, ijolite, syenite and carbonatite. The carbonatites occur as stocks, lenses, dykes and veins. Apatite grains in the apatite-magnetite sovite are characterized by three varieties of apparently syngenetic primary inclusions: The type S (solidified) inclusions contain highly birefringent and anisotropic solids along with some gas and liquid; the co-existing type F (fluid) inclusions are of two types-low to moderate salinity gas-liquid inclusions (gas= 15 to 35% by volume) and high salinity gas-liquid inclusions with one or more daughter minerals (halite, sylvite, carbonates). Type S inclusions homogenize into a relatively viscous, melt-like liquid at temperatures between 740 and 806°C whereas type F inclusions homogenize into a liquid phase at temperatures between 177 and 488°C. The large variation in homogenization temperatures between type S and type F inclusions and the difference in their composition are interpreted to be the result of a liquid immiscibility between a volatilerich carbonate melt and a saline aqueous fluid, though contribution of necking down of some original inclusions in generating clusters of type S and type F inclusions cannot be ruled out completely.Keywords
Carbonatite, Apatite, Fluid Inclusions, Liquid-Immiscibility, Sung Valley.- Geochemical Studies of Groundwater in Saharanpur, Uttar Pradesh
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Authors
Affiliations
1 Department of Earth Sciences, Indian Institute of Technology, Roorkee - 247 667, IN
1 Department of Earth Sciences, Indian Institute of Technology, Roorkee - 247 667, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 1 (2006), Pagination: 50-58Abstract
The geochemical characteristics of groundwater in Saharanpur city of Uttar Pradesh have been studied with a set of fifty water samples representing shallow groundwater of the area. The samples were collected during January and April 2003 which represent a season not characterized by excessive precipitation or evaporation. The samples were analyzed for various water quality parameters such as pH, electric conductivity, total dissolved solids, calcium, magnesium, sodium, potassium, bicarbonate, sulphate and chloride. Five groundwater samples were analyzed for Sr isotopic composition. The water is mostly Ca-Mg-HCO3 type and is derived from the carbonate lithology. A few rainwater samples were also analyzed. Chemical weathering process is the dominant factor in the overall water chemistry, however for some parameters like SO4, industrial effluents and/Or atmospheric precipitation could be a major source. Dominance of carbonate lithology on water chemistry is also observed by the low Sr isotopic ratios (87Sr/86Sr) in waters. The high carbonate contents could lead to scale formation which is a major problem in the region for domestic and industrial uses of water.Keywords
Groundwater, Geochemical Study, Saharanpur, Uttar Pradesh.- Geomorphotectonics around the Sung Valley Carbonatite Complex, Shillong Plateau, Northeast India: a Remote Sensing and Gis Approach
Abstract Views :177 |
PDF Views:138
Authors
Affiliations
1 Department of Earth Sciences, IIT Roorkee, Roorkee - 247 667, IN
2 Central Building Research Institute, Roorkee - 247 667, IN
3 Earthquake Engg., IIT Roorkee, Roorkee - 247 667, IN
1 Department of Earth Sciences, IIT Roorkee, Roorkee - 247 667, IN
2 Central Building Research Institute, Roorkee - 247 667, IN
3 Earthquake Engg., IIT Roorkee, Roorkee - 247 667, IN