Records of the Geological Survey of India, Volume 94The Survey, 1959 - Earthquakes 1867- includes the "Annual report of the Geological survey of India". |
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Page 249
... common feature . The chief impurity in such ores is iron - oxide . The chocolate - coloured or pinkish host rock contains anything up to 11 per cent . manganese . This rock sometimes grades into highly siliceous manganese - ore with ...
... common feature . The chief impurity in such ores is iron - oxide . The chocolate - coloured or pinkish host rock contains anything up to 11 per cent . manganese . This rock sometimes grades into highly siliceous manganese - ore with ...
Page 250
... common in breccia zones in more competent but less permeable quart- zites ; quartz - manganese rocks and highly siliceous ores occur where the khondalites are highly quartzose but granular , porous and permeable . ( 3 ) The deposits at ...
... common in breccia zones in more competent but less permeable quart- zites ; quartz - manganese rocks and highly siliceous ores occur where the khondalites are highly quartzose but granular , porous and permeable . ( 3 ) The deposits at ...
Page 262
... common with grains about 0.9 mm . across . In such aggregates the two minerals occur in more or less equal proportion . The mutual boundary relationship between the two is apparent . Elsewhere , areas of ilmenite grain - aggregate ...
... common with grains about 0.9 mm . across . In such aggregates the two minerals occur in more or less equal proportion . The mutual boundary relationship between the two is apparent . Elsewhere , areas of ilmenite grain - aggregate ...
Contents
GEOLOGICAL SURVEY OF INDIA | 190 |
STRUCTURE | 200 |
SUMMARY AND CONCLUSIONS | 209 |
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amphibole amphibole bearing quartzites amphibolites amygdaloidal aperture Balasore banded magnetite-hematite quartzites basalts beds biotite calcite cent chambers chondrules colour convolute laminations Cretaceous Deccan Traps deposits dipping district dolerites dune sands dykes east enstatite felspar ferruginous Figured specimen flows folds foraminifera formations G.S.I. Type garnet Genus Geol Geological Geologist gneisses grade grains granites grey quartzites heavy mineral hematite hornblende ilmenite intergrowth Kalahandi kilometres kyanite length Lenticulina limestone magnetite manganese content manganese-ore manganiferous khondalite Marginulina massive trap meta-intrusives meta-sediments metamorphism metres metres long metres wide Nishkhal occur old dunes olivine opaques outcrop pebbles phenocrysts plagioclase porphyritic porphyritic trap pyroxenes quartz quartzites Reuss ridge rutile samples sand dunes schistosity sediments shales siliceous sillimanite Soft vesicular species Subarnarekha Subarnarekha river Survey of India sutures thickness thin trend Utatur stage veins vesicles vesicular trap white gritty quartzites width Yerabali zircon