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Roy, Gautam
- Geothermometry and Oxygen Barometry of Coexisting Iron-Titanium Oxides of Majhgawan Diamondiferous Pipe, Madhya Pradesh
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Authors
Affiliations
1 National Mineral Development Corporation Ltd., Khanij Bhawan, Masab Tank, Hyderabad-500028, IN
2 Department of Applied Geochemistry, Osmania University, Hyderabad-500007, IN
3 302-Expresso Apts., Lakdikapool, Hyderabad-500004, IN
1 National Mineral Development Corporation Ltd., Khanij Bhawan, Masab Tank, Hyderabad-500028, IN
2 Department of Applied Geochemistry, Osmania University, Hyderabad-500007, IN
3 302-Expresso Apts., Lakdikapool, Hyderabad-500004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 1 (1997), Pagination: 55-60Abstract
Geothermometry of the coexisting magnetite-ilmenite (Mt-Ilm) pair from Majhgawan diamondiferous pipe indicates a temperature of 1150°C. The values of fO2 T and P fall in the equilibria field defined by iron-wustite (IW) and wustite magnetite (WM) indeating depth of sampling of about 155km and pressure of 46kbar.Keywords
Geothermometry, Geobarometry, Fe-Ti-Oxides, Majhgawan Pipe.- Chemistry of Garnet and Ilmenite from Majhgawan Diamondiferous Pipe, Panna District vis-a-vis Diamond Potential and Preservation
Abstract Views :157 |
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Authors
Affiliations
1 National Mineral Development Corporation Ltd., Khanij Bhavan, Masab Tank, Hyderabad - 500 028, IN
2 Applied Geochemistry Department, Osmania University, Hyderabad - 500 007, IN
1 National Mineral Development Corporation Ltd., Khanij Bhavan, Masab Tank, Hyderabad - 500 028, IN
2 Applied Geochemistry Department, Osmania University, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 4 (1997), Pagination: 441-448Abstract
The compositional trends in ilmenites from Majhgawan indicates slightly increased values of -log f02 i.e., 9.2. The divariant plots of Fe2O3 vs MgO and Cr2O3 vs MgO indicate resorption of most diamonds. The rounded-dedecahendra from indicates a preservation percentage of 65-70. The wine-red garnets from diamondiferous pipe are moderately subcalcic. The CaO vs Cr2O3 plot shows that they fall very close to the 85 percent Gurney line indicating emplacement at the craton margin having moderate diamond content. Geothermobarometry based on the co-existing pyropeknorringite and spinel geothermobarometer for the diamondiferous pipe yielded an equilibration temperature and pressure of 1160°C and 47 KbaT.Keywords
Economic Geology, Diamond. Geochemistry, Madhya Pradesh.- Fluid Inclusions Associated with Gold Mineralization in Kunchiganahalu Banded Iron formation, Chitradurga Schist Belt, Karnataka: a Preliminary Appraisal
Abstract Views :241 |
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Authors
Affiliations
1 National Mineral Development Corporation Ltd., Khanij Bhawan, Masab Tank, Hyderabad - 500028, IN
2 Department of Applied Geochemistry, Osmania University, Hyderabad - 500007, IN
1 National Mineral Development Corporation Ltd., Khanij Bhawan, Masab Tank, Hyderabad - 500028, IN
2 Department of Applied Geochemistry, Osmania University, Hyderabad - 500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 6 (2001), Pagination: 533-537Abstract
Three types of fluid inclusions i.e., Type I (C02-H2O) primary inclusions, trail- bound Type II biphase (H2O, L+V) inclusions and Type III monophase C02 inclusions associated within intra-granular fluid inclusion trails, have been observed in quartz veins associated with BIFs of Kunchiganahalu. For constraining the mobilization-deposition conditions in the high PT region, the isochore for Type I inclusions is drawn for the density of 0.86 gm/cm3 for a C02-H2O mixture with XCO2 of about 0.6. Type II inclusions are of low salinity (<2wt % NaCl equivalent) H2O variety with a density of 0.73 gm/cm3 Type III inclusions are of pure CO2 variety with a density of 0.81 gm/cm3. Conditions of the mobilizing fluid are approximated by the intersection of the upper temperature for the assemblage pyrite-arsenopyrite which is fixed at 491°C and may be considered as a minimum estimate, as this assemblage and the CO2-H2O isochore correspond to the Type I fluid inclusions. The main depositional condition is constrained through the intersection of the isochores for the low salinity H2O (Type II) and CO2 (Type III). The identified conditions are 1900±150 bars at 425±150°C.The modification of a parental CO2-H2O+-NaCl fluid during boiling resulted in the decrcase in the activity of reduced sulphur in the hydrothermal solution which ultimately led to gold precipitation.Keywords
Fluid Inclusions, Gold Mineralization, BIF, Kunchiganahalu, Chitradurga Belt, Karnataka, Dharwnr Craton.- Compositional Study of Spinels from Wajrakarur Pipe-10 (Anumpalle), Ananthapur District and its Significance in Diamond Prospectivity
Abstract Views :165 |
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Authors
Affiliations
1 National Mineral Development Corporation Ltd., Khanij Bhawan, Masab Tank, Hyderabad - 500 028, IN
2 Department of Earth Sciences. University of Cambridge, Cambridge CB2 3EQ, GB
3 Applied Geochemistry Department, Osmania University, Hyderabad - 500 007, IN
1 National Mineral Development Corporation Ltd., Khanij Bhawan, Masab Tank, Hyderabad - 500 028, IN
2 Department of Earth Sciences. University of Cambridge, Cambridge CB2 3EQ, GB
3 Applied Geochemistry Department, Osmania University, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 6 (1998), Pagination: 677-682Abstract
Geological Survey of India had recently discovered Wajrakarur pipe-10 and spinels from this pipe were analysed. Q-cluster analysis of these spinels based on Cr2O3, Al2O3, TiO2 and MgO contents indicate the presence of S1, S3, S4, S5 and S10 groups. S1 group spinels are supposed to be cogenetic with diamond i.e., stable in the mantle within the P-T regime under which diamonds are known experimentally to form. The Cr/(Cr+Al) vs Fe/(Fe+Mg) plot also show that a few spinels are from the field of diamond inclusion chromites. This study suggests probable diamondiferous nature of the Anumpalle pipe.Keywords
Geochemistry, Mineral Chemistry, Kimberlites, Diamond, Spinel, Andhra Pradesh.- Cluster Analysis and Nickel Thermometry of Garnet Xenocrysts from Majhgawan Diamondiferous Pipe, Panna District, Madhya Pradesh
Abstract Views :189 |
PDF Views:2
Authors
Affiliations
1 Natl. Min. Dev. Corp. Ltd., Khanij Bhawan, Masab Tank, Hyderabad - 500 028, IN
2 Applied Geochemistry Department, Osmania University, Hyderabad-500 007, IN
3 Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, GB
1 Natl. Min. Dev. Corp. Ltd., Khanij Bhawan, Masab Tank, Hyderabad - 500 028, IN
2 Applied Geochemistry Department, Osmania University, Hyderabad-500 007, IN
3 Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, GB