Records of the Geological Survey of India, Volume 97Geological Survey of India, 1969 - Earthquakes 1867- includes the "Annual report of the Geological survey of India". |
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Page 54
... pegmatites belong mainly to two broad cate- gories . ( 1 ) Those occurring in granite as dykes , i . e ... Pegmatites of the second category here contain commercially workable books of mica . RELATIONSHIP OF THE PEGMATITES WITH THE ...
... pegmatites belong mainly to two broad cate- gories . ( 1 ) Those occurring in granite as dykes , i . e ... Pegmatites of the second category here contain commercially workable books of mica . RELATIONSHIP OF THE PEGMATITES WITH THE ...
Page 55
... pegmatites and ptygmatically folded pegmatites are locally common . It may be concluded from the above features that the pegmatites have not been formed by in situ recrystallisation of the country rocks but from fluids emplaced into the ...
... pegmatites and ptygmatically folded pegmatites are locally common . It may be concluded from the above features that the pegmatites have not been formed by in situ recrystallisation of the country rocks but from fluids emplaced into the ...
Page 56
... pegmatites occur as cores in zoned pegmatites . All gradations from massive quartz bodies to granular aggregates of muscovite and quartz may be seen in individual pegmatites as well as in the same pegmatite where the two units are ...
... pegmatites occur as cores in zoned pegmatites . All gradations from massive quartz bodies to granular aggregates of muscovite and quartz may be seen in individual pegmatites as well as in the same pegmatite where the two units are ...
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Common terms and phrases
15th April alkali alkali-basalt alluvium Alwar Alwar valley basalt basalt magma beds belt Bengal Bihar borehole Calcutta carbonate coal coal-bearing unit coalfield Coccolithus sp Coniacian Contai country rock cracks crystallisation Daling Thrust Damudas Darjeeling Deccan Trap depression depth developed Diameter district dykes east east-west emplaced Eocene epicentre felt folds formation fossil G. S. I. Type Geol GEOLOGICAL SURVEY Gondwanas grains granitic groundwater hectares India Jour kankar Kirthar Middle Eocene Kutch lake lamprophyre lithological Lonar crater magma malachite material metamorphism meteorite craters mineral NaCl NaHCO3 nannoplanktons occurs olivine Pachydesmoceras patches pegmatites plagioclase PLATE polarised light pukka pumped quantity of reh quartz quartzite Rajasthan Raniganj Record Sagar Island sajji samples collected sand seams sediments Siwaliks sodium Specimen Stradner and Papp structure Surv SURVEY OF INDIA Talchir tenorite thickness tholeiitic tonnes transmitted and polarised tubewells vitrinite volcanic zone