Records of the Geological Survey of India, Volume 107The Survey, 1976 - Earthquakes Includes the Annual report of the Geological Survey of India, 1867- |
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Page 254
... thin sections was prepared and sub- mitted . Specific gravity for 94 samples was determined and camera Lucida sketches of pyritiferous and gypseous tuff , barytes rosette and crystal tuff , barytes replacing tuff and barytes replacing ...
... thin sections was prepared and sub- mitted . Specific gravity for 94 samples was determined and camera Lucida sketches of pyritiferous and gypseous tuff , barytes rosette and crystal tuff , barytes replacing tuff and barytes replacing ...
Page 39
... thin beds of quartzite , graywacke with conglomerate ( tilloid ) Meta - basalt with thin beds of quartzite and quartz - sericite schist Basement not seen- Surrounding the Chandranath granite the schistose formations occur to its 39.
... thin beds of quartzite , graywacke with conglomerate ( tilloid ) Meta - basalt with thin beds of quartzite and quartz - sericite schist Basement not seen- Surrounding the Chandranath granite the schistose formations occur to its 39.
Page 41
... Thin sections of the rock reveal the presence of fine - grained quartz and plagioclase to the extent of about 70 % , to 75 % , microcline about 10-15 % , perthite about 5 % , biotite about 5-8 % and minor amounts of muscovite , sericite ...
... Thin sections of the rock reveal the presence of fine - grained quartz and plagioclase to the extent of about 70 % , to 75 % , microcline about 10-15 % , perthite about 5 % , biotite about 5-8 % and minor amounts of muscovite , sericite ...
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amphibolite Andhra Pradesh Archaean bands basalt basin bauxite beds Bihar biotite block boreholes carried chalcopyrite chlorite clay Coalfield conglomerate copper cores Deccan Trap Delhi deposits depth Director district Division dolerite drilling epidote exposed felspar folds formation fossil galena geochemical Geol geological mapping Geological Survey Geologists Jr geophysical Ghosh Glossopteris Glossopteris flora gneiss gneissic complex Gondwana grade grained granite gneiss greenish greenstone belts grey Group hill holes horizon indicated investigation Kashmir Kurnool laterite limestone Lower mapped an area metamorphism mineralisation minerals occur Panjal trap pegmatite phyllite pits Project pyrite quartz quartz veins quartzite Quaternary Rajasthan Raniganj regional river rock types samples sand sandstone Sarvashri scale schist schistose seams sediments shale shear zone Shri Singh Siwalik spillway sq km Srivastava stratigraphic studies sulphide Survey of India thickness traverse trending tunnel unconformity Upper upto valley varies Vindhyan