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 19
... flow folds , ptyg- matic folds . Amphibolite U / L Foliated granite interbedded with quartzite beds ranging in thick- ness from a few centimeters to 80 meters ; gneissic at places ; ptygmatic folds . Amphibolite U / L Various schists ...
... flow folds , ptyg- matic folds . Amphibolite U / L Foliated granite interbedded with quartzite beds ranging in thick- ness from a few centimeters to 80 meters ; gneissic at places ; ptygmatic folds . Amphibolite U / L Various schists ...
Page 28
... flow texture defined by the alignment of small mica pheno- crysts . Some of them contain ultramafic nodules composed of pyroxenes , amphibole and mica with euhedral apatite crystals . The lamprophyres of the area have carbonatitic ...
... flow texture defined by the alignment of small mica pheno- crysts . Some of them contain ultramafic nodules composed of pyroxenes , amphibole and mica with euhedral apatite crystals . The lamprophyres of the area have carbonatitic ...
Page 70
... flow into it , and from the confluence onwards it is known as the Brahmaputra . In the Brahmaputra valley of Assam which is about 720 km long , the river flows from east to west in the lower reaches , whereas , in the upper reaches , the ...
... flow into it , and from the confluence onwards it is known as the Brahmaputra . In the Brahmaputra valley of Assam which is about 720 km long , the river flows from east to west in the lower reaches , whereas , in the upper reaches , the ...
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