Records of the Geological Survey of India, Volume 105Geological Survey of India, 1973 - Earthquakes |
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Page 176
... veins ; and ( b ) Whether sufficient late stage fluids were available in the system for accumulation of these elements . A comparative study between the concentration of lead in granite and that in quartz veins ( which on field and ...
... veins ; and ( b ) Whether sufficient late stage fluids were available in the system for accumulation of these elements . A comparative study between the concentration of lead in granite and that in quartz veins ( which on field and ...
Page 177
quartz veins are present ) the ratio Average concentration of Pb in granite / Average concentration of Pb in " galena - free " vein quartz ranges between 0.25 and 0.60 . Since the effective radius of Pb 2 is 1.32 Å , Pb in pure vein ...
quartz veins are present ) the ratio Average concentration of Pb in granite / Average concentration of Pb in " galena - free " vein quartz ranges between 0.25 and 0.60 . Since the effective radius of Pb 2 is 1.32 Å , Pb in pure vein ...
Page 207
... veins are given off , the pre- sent specimen possesses numerous forked veins mostly given off directly from the rachis and there is no mid - rib . It differs from T. chunakhalensis Sah and Sukhdev which has a prominent mid - rib ...
... veins are given off , the pre- sent specimen possesses numerous forked veins mostly given off directly from the rachis and there is no mid - rib . It differs from T. chunakhalensis Sah and Sukhdev which has a prominent mid - rib ...
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