Records of the Geological Survey of India, Volume 129, Parts 3-4Government of India, 1994 - Geology Includes the "Annual report of the Geological Survey of India," 1867- |
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Page 66
... occurs within the core of the Ongarbira synform which is defined by a folded sequence of mafic - ultramafic volcanics and quartzites and surrounded by a low grade psammopelitic assemblage . The discovery of the felsic volcanics , which ...
... occurs within the core of the Ongarbira synform which is defined by a folded sequence of mafic - ultramafic volcanics and quartzites and surrounded by a low grade psammopelitic assemblage . The discovery of the felsic volcanics , which ...
Page 70
... occurs with orthoclase as subordinate minerals . Nepheline , alkali amphibole ( kersutite ) , biotite and olivine occur as minor constituents . Apatite and rutile occur as accesso- ries . The rock shows hypidiomorphic granular texture ...
... occurs with orthoclase as subordinate minerals . Nepheline , alkali amphibole ( kersutite ) , biotite and olivine occur as minor constituents . Apatite and rutile occur as accesso- ries . The rock shows hypidiomorphic granular texture ...
Page 73
... occurs stratigraphically along the strike extension of the Barail Series in the adjoining areas . Unit B , which occurs in the western part of the area , is characterised by low , undulatory topography and dendritic drainage pattern . It ...
... occurs stratigraphically along the strike extension of the Barail Series in the adjoining areas . Unit B , which occurs in the western part of the area , is characterised by low , undulatory topography and dendritic drainage pattern . It ...
Contents
WEST BENGAL SIKKIM A N ISLANDS | 1 |
Report of investigation for rare metal mineralisation within pegmatite | 7 |
Gold | 14 |
Copyright | |
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acid volcanics amphibolite Andaman anomaly Arunachal Pradesh Assam bands basemetal basin bed rock belt Bihar biotite block boreholes Chhotanagpur clay Code colour comprising conglomerate covered depth Division drilling dykes east eastern Engineering Geology erosion exploration exposed fault feldspar field season fold foliation Formation geochemical GEOLOGICAL MAP geophysical GEOTECHNICAL INVESTIGATION gneiss gneissic gold Gondwana grade granite granite gneiss granitoids grey Group of rocks GSI Rec Hills district identified intrusives Karbi Anglong laterite limestone lineament lithological located medium grained Meghalaya mica schist migmatites mineralisation minerals nala occurs Orissa OVERVIEW pegmatite phyllite plagioclase Proterozoic Purulia district quartz quartz veins quartzite Quaternary Region river sand sandstone scale schist sector sequence shale Shillong Shillong Group Sikkim siltstone Singhbhum slope soil spillway sq km STAGE GEOTECHNICAL INVESTIGATION stream sediment samples structure sulphide Surface SURVEY OF INDIA terrain thick Toposheet trending ultramafic upto West Bengal western