Records of the Geological Survey of India, Volume 114Geological Survey of India, 1984 - 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 . 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 66.3 ...
... syenites of the present area . Modal analyses of the syenites and nepheline syenites are given in Table - I . 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 66.3 ...
Page 61
... syenites formed from a melt which earlier gave rise to the nepheline - free syeni- ( 3 ) ( 4 ) 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 ) ( 4 ) 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 | 1 |
On Jacobsites from Vizianagaram Manganese Belt of Eastern Ghats Andhra | 15 |
Fossil Hippopotamus from Quaternary Alluvial Deposits of Narmada Valley | 17 |
Copyright | |
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actinolite amphiboles amphibolite analysis ARCHAEAN assemblage associated BANKURA DISTRICT Barakar basement bedrock samples Bihar Biotite boreholes catchment area Chakradharpur chemical colour composition country rocks crystals Dassarma Dolerite Domuhan river Dubrajpur Dubrajpur Formation Electron elements epidiorites geochemical Geol Geological Survey Ghose gneiss Goilkera gold grains Granite gneiss green GSI Type Haast river Hippopotamus hornblende hornblende schist host rock igneous jacobsite Kharswan strip Khatangi hill section magnetite manganese Manuscript received massive amphibolite Mayapur McCluskieganj meta-basic rocks metamorphic metres south mica schists mineralisation minerals namadicus Narmada Neogene nepheline syenite occur palaeindicus Pegmatite pelite phyllites plagioclase Porphyritic present area quartz Quartzite Quaternary ratios Rupatganj 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 three strips values vein-quartz veins West Bengal X-Ray