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. |
From inside the book
Results 1-3 of 6
Page 28
... fraction in some dykes . In addition , pools and veins of carbonatitic material are seen in a few dykes . A characteristic feature of some of the lamprophyre dykes of the area is the presence of leucocratic globular structures termed ...
... fraction in some dykes . In addition , pools and veins of carbonatitic material are seen in a few dykes . A characteristic feature of some of the lamprophyre dykes of the area is the presence of leucocratic globular structures termed ...
Page 56
... fraction G 1000 800 500 2/30 NM Non - mag- G 1000 1000 700 netic fraction Phase identi- fiable under the microscope Magnetite - cass- iterite ( by XRD ) Cassiterite not detected G- greater than The above table shows almost equal ...
... fraction G 1000 800 500 2/30 NM Non - mag- G 1000 1000 700 netic fraction Phase identi- fiable under the microscope Magnetite - cass- iterite ( by XRD ) Cassiterite not detected G- greater than The above table shows almost equal ...
Page 57
... fraction consists mainly of sulphide minerals and silicates like mica , garnet etc. Curiously , cassiterite was not detected by X - ray in the non - magnetic fraction which analysed higher concentration of Sn , compared to the magnetic ...
... fraction consists mainly of sulphide minerals and silicates like mica , garnet etc. Curiously , cassiterite was not detected by X - ray in the non - magnetic fraction which analysed higher concentration of Sn , compared to the magnetic ...
Contents
A NOTE ON THE EVOLUTION OF THE MINERAL | 17 |
Pant | 24 |
A R Nambiar | 43 |
Copyright | |
3 other sections not shown
Other editions - View all
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