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
... syenites are essentially composed of sodic plagioclase , microcline and biotite with minor amounts of apatite and opaque minerals . Calcite always occurs as an accessory mineral in the nepheline - bearing syenites . Chemical analy- ses ...
... syenites are essentially composed of sodic plagioclase , microcline and biotite with minor amounts of apatite and opaque minerals . Calcite always occurs as an accessory mineral in the nepheline - bearing syenites . Chemical analy- ses ...
Page 60
... syenites of the present area . Modal analyses of the syenites and nepheline syenites are given in Table - I . Biotite TABLE - I Modal Analyses ( Volume % ) of Syenite and Nepheline Syenite * 1 2 3 4 5 6 7 Plagioclase 49.1 53.8 44.2 65.3 ...
... syenites of the present area . Modal analyses of the syenites and nepheline syenites are given in Table - I . Biotite TABLE - I Modal Analyses ( Volume % ) of Syenite and Nepheline Syenite * 1 2 3 4 5 6 7 Plagioclase 49.1 53.8 44.2 65.3 ...
Page 61
... syenites formed from a melt which earlier gave rise to the nepheline - free syeni- ( 3 ) tes . The mineral paragenesis in the syenites shows a perfectly normal order . Presence of considerable amount of volatiles in the syenite ...
... syenites formed from a melt which earlier gave rise to the nepheline - free syeni- ( 3 ) tes . The mineral paragenesis in the syenites shows a perfectly normal order . Presence of considerable amount of volatiles in the syenite ...
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