Records of the Geological Survey of India, Volume 105Geological Survey of India, 1973 - Earthquakes |
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Page 83
... fracture line . The geomorphology of the area , the fracture system and the dip data of the basaltic flows in the region point towards a monoclinal flexure in response to a reactivated basement fracture during a post - Deccan Trap ...
... fracture line . The geomorphology of the area , the fracture system and the dip data of the basaltic flows in the region point towards a monoclinal flexure in response to a reactivated basement fracture during a post - Deccan Trap ...
Page 88
... fracture , marked in the map , occupies a narrow zone with very closely spaced joint planes usually a centimetre or even less apart . These joints are almost always vertical or very steeply dipping towards east or west . Within the tail ...
... fracture , marked in the map , occupies a narrow zone with very closely spaced joint planes usually a centimetre or even less apart . These joints are almost always vertical or very steeply dipping towards east or west . Within the tail ...
Page 92
... fractures including the Koyna river valley from near Mahabaleswar in the north to Helwak in the south . 2. This zone of structural weakness is regarded as due to reacti- vation of tensional fracture within the basement in a post ...
... fractures including the Koyna river valley from near Mahabaleswar in the north to Helwak in the south . 2. This zone of structural weakness is regarded as due to reacti- vation of tensional fracture within the basement in a post ...
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