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 32
... suggest that lamprophyres crystallised at a relatively early stage of evolution of the complex . In Q - - Ne Ks diagram ( Fig . 8b ) , the composition of these rocks plot close to the phonolite minimum and below the alkali feldspar ...
... suggest that lamprophyres crystallised at a relatively early stage of evolution of the complex . In Q - - Ne Ks diagram ( Fig . 8b ) , the composition of these rocks plot close to the phonolite minimum and below the alkali feldspar ...
Page 34
... suggested that trachyte may be the immediate parent magma for both tinguaite and alkali rhyolite reported from the area ... suggest that the Sylhet volcanism has a wider span in space and time , than usually conceived of . This enormous ...
... suggested that trachyte may be the immediate parent magma for both tinguaite and alkali rhyolite reported from the area ... suggest that the Sylhet volcanism has a wider span in space and time , than usually conceived of . This enormous ...
Page 86
... suggest preventive measures . After the investigation , this joiht commi- ttee suggested construction of storage reservoirs along the upper reaches of Kopili river for flood moderation and miti- gation . In 1946 , Central Waterways ...
... suggest preventive measures . After the investigation , this joiht commi- ttee suggested construction of storage reservoirs along the upper reaches of Kopili river for flood moderation and miti- gation . In 1946 , Central Waterways ...
Contents
A NOTE ON THE EVOLUTION OF THE MINERAL | 17 |
Pant | 24 |
A R Nambiar | 43 |
Copyright | |
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Common terms and phrases
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