Records of the Geological Survey of India, Volume 115, Parts 3-4The Survey, 1987 - Earthquakes Vols. 1- include Report of the Geological Survey, 1867- ; v. 32- include Review of the mineral production of India, 1898/1903- ; v. 75 consists of Professional papers, no. 1-16; v. 76 consists of Bulletins of economic minerals. |
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Page 30
... Carbonatites In texture , carbonatite is hypidiomorphic granular and the grain size ranges from fine to medium grained . The weathered carbonatite has a brown crust . Very fine grained buff coloured variety of carbonatite is also met ...
... Carbonatites In texture , carbonatite is hypidiomorphic granular and the grain size ranges from fine to medium grained . The weathered carbonatite has a brown crust . Very fine grained buff coloured variety of carbonatite is also met ...
Page 32
... carbonatite differentiates occurring as discrete dykes in the southern part of the dyke system . Petrographic studies and field relations indicate a close relationship between lamprophyres and carbonatites of the area which suggest that ...
... carbonatite differentiates occurring as discrete dykes in the southern part of the dyke system . Petrographic studies and field relations indicate a close relationship between lamprophyres and carbonatites of the area which suggest that ...
Page 34
... carbonatites from many complexes ( Le Bas , 1981 ) . So , it appears that though carbonatites are reported only as thin dykes from the area , these feldspathic dyke rocks may also be fenites related to an unexposed large carbonatite ...
... carbonatites from many complexes ( Le Bas , 1981 ) . So , it appears that though carbonatites are reported only as thin dykes from the area , these feldspathic dyke rocks may also be fenites related to an unexposed large carbonatite ...
Contents
A NOTE ON THE EVOLUTION OF THE MINERAL | 17 |
Pant | 24 |
A R Nambiar | 43 |
Copyright | |
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aegirine alkaline rocks Arunachal Pradesh assemblage Barail Range bedded biotite borehole Brahmaputra camptonites carbonatite Chalcopyrite charnockite chlorite Coal cordierite deposits Disang dissected hills drainage dyke Evans feldspar feldspathic ijolite flood plain foliation fractured garnet Geol GEOLOGICAL SURVEY gneiss Golagar basin Golagar Nala grains GSI Rec 115 Hills district Himalaya ijolite immiscibility Indravati river inner belt Kohima Kohima synclinorium Kopili Koraput lamprophyres landforms magma magnetite Manipur Meghalaya metamorphic metapelites Mikir hills mineral mineralised zone muscovite Nagaland Nala Naogaon Naogaon Sandstone NE-SW occur Orissa orthoclasite phenocrysts Phyangla Plate point bar polymetallic porphyroblasts Potin Formation pyrite pyrrhotite quartz Ranga River Ranga Valley Rec 115 pts region ridge and valley samples San Nala sandstone schist shale Shillong staurolite Structural Plateau Subansiri district sulphide mineralisation Surma Surv SURVEY OF INDIA synclinorium tectonic Tikak parbat tinguaite trending tributaries type area Umrong reservoir units Upper Assam upto