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
... rocks of alkaline characters including lamprophyres , feldspathic ijolites , tinguaites and carbonatite from parts of East Garo and West Khasi Hills districts of Meghalaya . A preliminary account of the petrographical and chemical ...
... rocks of alkaline characters including lamprophyres , feldspathic ijolites , tinguaites and carbonatite from parts of East Garo and West Khasi Hills districts of Meghalaya . A preliminary account of the petrographical and chemical ...
Page 27
... rocks ( fenites ) . Basalts and dolerites are the other dyke rocks occurring in the area . Reconnaissance traverses taken further north near Khendra have shown the occurrence of a dyke rock mainly composed of apatite , magnetite ...
... rocks ( fenites ) . Basalts and dolerites are the other dyke rocks occurring in the area . Reconnaissance traverses taken further north near Khendra have shown the occurrence of a dyke rock mainly composed of apatite , magnetite ...
Page 42
... rocks . 1. Migmatitic gneisses 2. Porphyroblastic granitoids 3. Equigranular pink granites 4. Location of dyke rocks : 1 lamprophyre t = tinguaite / feldspathic ijolite c = carbonatite k = feldspar rich dyke rocks ( fenite ) d = basalt ...
... rocks . 1. Migmatitic gneisses 2. Porphyroblastic granitoids 3. Equigranular pink granites 4. Location of dyke rocks : 1 lamprophyre t = tinguaite / feldspathic ijolite c = carbonatite k = feldspar rich dyke rocks ( fenite ) d = basalt ...
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