Records of the Geological Survey of India, Volume 105, Part 2Geological Survey of India, 1973 - 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. |
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Page 41
... plagioclase in equal quantities are the chief minerals . Plagioclase crystals include pyroxenes which in turn include olivine . ( 4 ) Gabbro - forms the outermost zone composed mostly of augite and plagioclase with few olivines and ...
... plagioclase in equal quantities are the chief minerals . Plagioclase crystals include pyroxenes which in turn include olivine . ( 4 ) Gabbro - forms the outermost zone composed mostly of augite and plagioclase with few olivines and ...
Page 107
... plagioclase and pyroxene occur in phenocrysts of different sizes . They also contain cavities some of which are lined by secondary quartz and chalcopy- rite ( ? ) . In mineral composition , they contain less plagioclase and more ...
... plagioclase and pyroxene occur in phenocrysts of different sizes . They also contain cavities some of which are lined by secondary quartz and chalcopy- rite ( ? ) . In mineral composition , they contain less plagioclase and more ...
Page 108
... plagioclase plates . The symmetrical extinction angle ( 36 ° to 42 ° ) and refractive index ( N = 1.560 ± .002 ) indicate that the plagioclase is of the composition of labradorite ( An 。 0-64 ) . Ꮓ Orthopyroxene occurs in varying ...
... plagioclase plates . The symmetrical extinction angle ( 36 ° to 42 ° ) and refractive index ( N = 1.560 ± .002 ) indicate that the plagioclase is of the composition of labradorite ( An 。 0-64 ) . Ꮓ Orthopyroxene occurs in varying ...
Contents
RECORDS | 2 |
The Geology and Mineral Resources of the Andaman | 25 |
Geology of the Coal Measures in the Deccan Trap region | 69 |
Copyright | |
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80 mesh amphibolites analysed Andaman island anorthosites apatite bands Baraganda Baratang Baratang island basaltic basin beds Bihar biotite Bramlette and Riedel calc-granulite calcareous calcite carbonate Carboniferous charnockites chemical clay coal coalfield coalseams conglomerate copper Deflandre deposit Discoaster district endothermic endothermic peak Eocene estherids fauna felspar figs folds foliation Formation fossil gabbro Gangamopteris garnetiferous geochemical Geol Geological Survey glacier gneisses Gondwana grains granitic gray graywacke hill INDIA Records indicate khondalites Krol limestone lodes Lower margins metadolerite metal Middle Andaman mineral mineralisation Mussoorie Nala occur Orissa orthopyroxene oxides para-amphibolite Permian phosphate phosphorite pinnules plagioclase Plate present pyroxene quartz quartzite rocks samples sandstone schist sedimentary sediments shales shear shows siltstone snout South Andaman Stradner strike length Surv Survey of India thickness Thinnfeldia tion tonnes trace element ultrabasic upto valley varies veins younger ortho-amphibolite Zemu glacier zone