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 26
... dyke swarm intruding the country rocks which consist of migmatitic gneisses , porphy- roblastic granitoids and leucogranites in parts of East Garo and West Khasi Hills ( Fig 6 ) . The dyke swarm is 7-8 kms wide and extends from south of ...
... dyke swarm intruding the country rocks which consist of migmatitic gneisses , porphy- roblastic granitoids and leucogranites in parts of East Garo and West Khasi Hills ( Fig 6 ) . The dyke swarm is 7-8 kms wide and extends from south of ...
Page 27
... dyke activity is more intense in the vicinity of the Nongchram fault , particularly in the southern part of the fault . The dyke members related to alkaline magmatism include lamprophyres , feldspathic ijolites , tinguaites , car ...
... dyke activity is more intense in the vicinity of the Nongchram fault , particularly in the southern part of the fault . The dyke members related to alkaline magmatism include lamprophyres , feldspathic ijolites , tinguaites , car ...
Page 43
Geological Survey of India. Plate 2 2.1 Explanation of Plates 2.2 2.3 Thin lamprophyre dyke ( L ) traversing the gneisses . Loc : Riangdo river . Carbonatite dyke ( C ) traversing the gneisses . Note the tapering of the dyke . Loc ...
Geological Survey of India. Plate 2 2.1 Explanation of Plates 2.2 2.3 Thin lamprophyre dyke ( L ) traversing the gneisses . Loc : Riangdo river . Carbonatite dyke ( C ) traversing the gneisses . Note the tapering of the dyke . Loc ...
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