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Maitra, Monoj
- On the Tonalitic Suite of Khammam, A.P.- A Study of Mineral Correlation as Petrogenetic Clue
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Authors
Affiliations
1 Department of Geology, Presidency College, Calcutta 700073, IN
1 Department of Geology, Presidency College, Calcutta 700073, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 7 (1985), Pagination: 481-485Abstract
Extensive occurrence of granitoid suite comprising tonalite-granodiorite and granite around Khammam, A.P. is reported. Correlation between mineralogical attributes (free from close table effect) having petrogenetic significance has been achieved through statistical procedure. It is indicated that members of the suites are interrelated by a broad fractionation history.
- Interpretative Mineral Chemistry of Ultramafic Rocks of Chalk Hills, Tamil Nadu
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Authors
Affiliations
1 Department of Geology, Presidency College, 86/1 College Street, Kolkata - 700 073, IN
2 Department of Geology, Calcutta University, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
1 Department of Geology, Presidency College, 86/1 College Street, Kolkata - 700 073, IN
2 Department of Geology, Calcutta University, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 5 (2006), Pagination: 831-840Abstract
The ultramafic rocks of Chalk Hills near Salem, comprise dunite, wehrlite and olivine clinopyroxenite in association with mafic alkaline rocks. The constituent phases of the ultramafics have been analysed and their compositional data have been evaluated to assess petrogenetic factors. Dunite appears to be restite formed through mantle melting whereas wehrtite and olivine clinopyroxenite represent successive progressive cumulation products from transported high magnesian melt. Mineral chemistry of mafic phases and compositional interrelation between them indicates an equilibration temperature of 1022° to 1088°C for wehrtite and a relatively lower temperature level (ca 900°C) for olivine clinopyroxenite. It appears that the extracted high magnesian melt generating the wehrlite and olivine clinopyroxenicte cumulates, equilibrated at shallower level near base of the crust under ca 11 kb pressure.Keywords
Mineral Chemistry, Mantle Restite, Wehrlite-olivine Clinopyroxenite, Magmatic Equilibration Temperature.- Presence of Niobian Rutile and its Exsolution Phases in Rare Element Pegmatite of Belamu Area, Purulia District, West Bengal
Abstract Views :186 |
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Authors
Affiliations
1 Central Petrological Laboratories, Geological Survey of India, Kolkata, IN
1 Central Petrological Laboratories, Geological Survey of India, Kolkata, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 3 (2009), Pagination: 296-298Abstract
No Abstract.References
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