Records of the Geological Survey of India, Volume 105Geological Survey of India, 1973 - Earthquakes |
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Page 37
... seen along the grain boundaries . Limonitised eu - and sub - hedral pyrite grains are common . The rock in general is devoid of mineral orientation but one specimen showed preferred orientation of the elongated grains . Disseminations ...
... seen along the grain boundaries . Limonitised eu - and sub - hedral pyrite grains are common . The rock in general is devoid of mineral orientation but one specimen showed preferred orientation of the elongated grains . Disseminations ...
Page 73
... seen in areas where the trap rocks have been denuded . Often , they are exposed in the scarp sections , capped by ... seen in between the different flows consist mostly of grayish to greenish shales but blackish shales with humus matter ...
... seen in areas where the trap rocks have been denuded . Often , they are exposed in the scarp sections , capped by ... seen in between the different flows consist mostly of grayish to greenish shales but blackish shales with humus matter ...
Page 119
... seen under the microscope , in most of the cases hornblande appears to be secondary after pyroxene . Tiny cluster and blebs of quartz recognisable along the pyroxene - hornblende borders provide sufficient evidence to support the above ...
... seen under the microscope , in most of the cases hornblande appears to be secondary after pyroxene . Tiny cluster and blebs of quartz recognisable along the pyroxene - hornblende borders provide sufficient evidence to support the above ...
Contents
CONTENTS | 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 deposition Discoaster district endothermic endothermic peak Eocene estherids fauna felspar figs folds foliation Formation fossil gabbro Gangamopteris garnetiferous geochemical Geol Geological Survey Geologist glacier gneisses Gondwana grained granitic gray anorthosites graywacke hill hornblende indicate khondalites limestone lodes Lower margins metadolerite metal Middle Andaman mineral mineralisation Mussoorie Nala Nicobar occur Orissa orthopyroxene oxides para-amphibolite Permian phenocrysts phosphate phosphorite pinnules plagioclase present pyroxene quartz quartzite rocks samples sandstone 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 volcanic younger ortho-amphibolite Zemu glacier zone