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 48
... identified by XRD ) porphyroblasts , upto 2-3 cms across , are highly fractured . Biotites of earlier generation are altered to chlorite . Rare tourmaline occurs along foliation planes . Sulphides , mainly pyrite and chalcopy- rite ...
... identified by XRD ) porphyroblasts , upto 2-3 cms across , are highly fractured . Biotites of earlier generation are altered to chlorite . Rare tourmaline occurs along foliation planes . Sulphides , mainly pyrite and chalcopy- rite ...
Page 57
... identified by X - ray in both the fractions . Cassiterite is non - magnetic but recent studies ( Taylor , 1979 ) ... identification , the results of which are given in the Table - VIII . TABLE - VI Analytical data of Magnetic and Non - GSI ...
... identified by X - ray in both the fractions . Cassiterite is non - magnetic but recent studies ( Taylor , 1979 ) ... identification , the results of which are given in the Table - VIII . TABLE - VI Analytical data of Magnetic and Non - GSI ...
Page 79
... identified in individual sections can be given status of Members only . Impersistence of the individual litho units on regional scale makes it difficult to identify and map them on 1 : 50,000 scale ; accordingly any further ...
... identified in individual sections can be given status of Members only . Impersistence of the individual litho units on regional scale makes it difficult to identify and map them on 1 : 50,000 scale ; accordingly any further ...
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