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 37
... grains of quartz ( some of which have corroded grain boundaries and contain dusty inclusion ) , twinned felspar ( 10 % , some grains show alteration to sericite and calcite ) , rock fragments ( compara- tively more than felspar ) and ...
... grains of quartz ( some of which have corroded grain boundaries and contain dusty inclusion ) , twinned felspar ( 10 % , some grains show alteration to sericite and calcite ) , rock fragments ( compara- tively more than felspar ) and ...
Page 41
... grains show typical hour glass texture . In the North Andaman , Roychowdhury and Sarkar ( 1967-68 ) described wehrlite and harzburgite from the ultrabasics . Wehrlite consists of several relict grains of unaltered and partially altered -6 4 ...
... grains show typical hour glass texture . In the North Andaman , Roychowdhury and Sarkar ( 1967-68 ) described wehrlite and harzburgite from the ultrabasics . Wehrlite consists of several relict grains of unaltered and partially altered -6 4 ...
Page 123
... grains ranges from very minute grains up to 1.22 x 0.8 mm . and the prismatic up to 0.74 x 0.46 mm . Zoning is common . In the intrusive , occurring west of Rongbu , some of the crystals have aegirine rich cores . Biotite is present as ...
... grains ranges from very minute grains up to 1.22 x 0.8 mm . and the prismatic up to 0.74 x 0.46 mm . Zoning is common . In the intrusive , occurring west of Rongbu , some of the crystals have aegirine rich cores . Biotite is present as ...
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