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 12
... biotite granite ( composite granite ) has been observed . High grade granulite facies rocks are found to occur as xenoliths within composite biotite granite gneiss near Dumdumi and Chharrah . Some pegma- tite bodies have been sampled ...
... biotite granite ( composite granite ) has been observed . High grade granulite facies rocks are found to occur as xenoliths within composite biotite granite gneiss near Dumdumi and Chharrah . Some pegma- tite bodies have been sampled ...
Page 142
... biotite - chlorite schist , quartz - chlorite - biotite schist , meta- ultramafites , gabbbro , quartzite , metabasalt ( massive , schistose , amygdaloidal ) and mylonitised quartz schist . The Chaibasa Formation consists of quartz ...
... biotite - chlorite schist , quartz - chlorite - biotite schist , meta- ultramafites , gabbbro , quartzite , metabasalt ( massive , schistose , amygdaloidal ) and mylonitised quartz schist . The Chaibasa Formation consists of quartz ...
Page 70
... biotite and nepheline occur as subor- dinate minerals . Sphene , apatite , rutile are the common acces- sories . Phenocrysts of olivine are present in the groundmass of pyroxenites and often show corona structure . The coarse grained ...
... biotite and nepheline occur as subor- dinate minerals . Sphene , apatite , rutile are the common acces- sories . Phenocrysts of olivine are present in the groundmass of pyroxenites and often show corona structure . The coarse grained ...
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