Records of the Geological Survey of India, Volume 114Geological Survey of India, 1979 - Earthquakes 1867- includes the "Annual report of the Geological survey of India". |
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Page 59
... nepheline - bearing syenites . Chemical analy- ses show that the nepheline syenites of this area are of miaskitic type . Field and laboratory evidences indicate that these rocks were probably formed from silica - poor alkaline melt ...
... nepheline - bearing syenites . Chemical analy- ses show that the nepheline syenites of this area are of miaskitic type . Field and laboratory evidences indicate that these rocks were probably formed from silica - poor alkaline melt ...
Page 60
Geological Survey of India. Nepheline syenites always contain some amount of calcite in the from of medium - sized , subhedral to anhe- dral grains . It is interesting to note that calcite is absent in the nepheline - free syenites . The ...
Geological Survey of India. Nepheline syenites always contain some amount of calcite in the from of medium - sized , subhedral to anhe- dral grains . It is interesting to note that calcite is absent in the nepheline - free syenites . The ...
Page 61
... nepheline syenite have been chemically analysed . The analyses along with the nor- mative compositions are given in Table - II . TABLE - II Chemical Composition No. 13 No. 15 ( 2 ) The nepheline - bearing syenites formed from a melt ...
... nepheline syenite have been chemically analysed . The analyses along with the nor- mative compositions are given in Table - II . TABLE - II Chemical Composition No. 13 No. 15 ( 2 ) The nepheline - bearing syenites formed from a melt ...
Contents
Integrated Geochemical Approach for Tracing Gold Mineralisation in Parts of | 1 |
On Jacobsites from Vizianagaram Manganese Belt of Eastern Ghats Andhra | 15 |
Fossil Hippopotamus from Quaternary Alluvial Deposits of Narmada Valley | 17 |
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Common terms and phrases
actinolite amphiboles amphibolites analysis Archaean assemblage BANKURA DISTRICT Barakar Barakar Formation basement bedrock samples Bihar biotite boreholes calcite catchment area Chakradharpur chemical Chittorgarh coarse colour composition country rocks crystals Dassarma deposit Dubrajpur Dubrajpur Formation Electron elements epidiorites fossils geochemical Geol Geological Survey Ghose gneiss Goilkera granite gneiss GSI Type Hippopotamus hornblende hornblende schist host rock jacobsite Kharswan Khatangi hill section lithological magnetite manganese Manuscript received massive amphibolites McCluskieganj meta-basic rocks metamorphic metres mineralisation minerals namadicus Narmada nepheline syenite Nimbahera Nimbahera limestone occur palaeindicus phyllitic plagioclase Plate present area quartz Quartzite Quaternary Rajmahal Hills Records Vol river Rupatganj Sah and Shah Sawa schist schistose schistose amphibolite sediments shale Singhbhum Singhbhum Shear Zone specimens stratigraphic stream sediment-concentrate samples sulphide Surv Survey of India Table-II Talapatra texture values vein-quartz veins Vindhyan West Bengal X-Ray Λ Λ