Records of the Geological Survey of India, Volume 105Geological Survey of India, 1973 - Earthquakes |
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Page 35
... sheared and brecciated and folded with development of slickensided shear surface and puckering ( in the schist ) . High degree of brecciation and intense permeation by secon- dary calcite and quartz veins suggest that these rocks have ...
... sheared and brecciated and folded with development of slickensided shear surface and puckering ( in the schist ) . High degree of brecciation and intense permeation by secon- dary calcite and quartz veins suggest that these rocks have ...
Page 88
... shear joints indicating that the shear joints are younger in origin . Each sheared 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 ...
... shear joints indicating that the shear joints are younger in origin . Each sheared 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 ...
Page 89
... shear fractures surrounding them represent a major zone of crustal weakness and instability . The shear fractures are most concentrated in a north - south zone limited to the east by the Koyna river and extending almost upto the coast ...
... shear fractures surrounding them represent a major zone of crustal weakness and instability . The shear fractures are most concentrated in a north - south zone limited to the east by the Koyna river and extending almost upto the coast ...
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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Common terms and phrases
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