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 31
... lamprophyres suggested by Rock ( 1977 ) . The analyses plot in the field of alkaline lamprophyres in a triangular diagram of normative parameters ( Ab + An + Ne - Or + Lc - 01 + Px + Mt + Ilm ) separating alkaline from shoshonitic ...
... lamprophyres suggested by Rock ( 1977 ) . The analyses plot in the field of alkaline lamprophyres in a triangular diagram of normative parameters ( Ab + An + Ne - Or + Lc - 01 + Px + Mt + Ilm ) separating alkaline from shoshonitic ...
Page 32
... lamprophyres also which is reflected in the appearance of diopside in norm . The lamprophyres contain upto 29.18 % of normative diopside . The plots of tinguaite define a fractionation trend away from the Si0 , apex towards the region ...
... lamprophyres also which is reflected in the appearance of diopside in norm . The lamprophyres contain upto 29.18 % of normative diopside . The plots of tinguaite define a fractionation trend away from the Si0 , apex towards the region ...
Page 33
... lamprophyric magma gave rise to microscopic pools of carbonatite occurring within lamprophyres . Alkaline lamprophyre magmas are not likely to be primitive magmas which rose directly from the mantle without significant low pressure ...
... lamprophyric magma gave rise to microscopic pools of carbonatite occurring within lamprophyres . Alkaline lamprophyre magmas are not likely to be primitive magmas which rose directly from the mantle without significant low pressure ...
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