Records of the Geological Survey of India, Volume 113, Parts 2-4Government of India, 1983 - Geology Includes the "Annual report of the Geological Survey of India," 1867- |
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Page 6
... places , but in the pelitic rocks they were mostly obliterated . S1 data do not show any clear pattern ; however , the influence of the F , folds is discernible in some subareas ( viz . , subareas 3 , 4 and 12 ; Plate 4 , fig 3 , 4 and ...
... places , but in the pelitic rocks they were mostly obliterated . S1 data do not show any clear pattern ; however , the influence of the F , folds is discernible in some subareas ( viz . , subareas 3 , 4 and 12 ; Plate 4 , fig 3 , 4 and ...
Page 9
... places as big and round crystals containing randomly oriented quartz inclusions . At places , the rock exhibits crude hypidiomorphic texture with subhedral crystals of feldspars ( both potash and soda ) and anhedral grains of quartz ...
... places as big and round crystals containing randomly oriented quartz inclusions . At places , the rock exhibits crude hypidiomorphic texture with subhedral crystals of feldspars ( both potash and soda ) and anhedral grains of quartz ...
Page 25
... places highly altered to mica- ceous and zeolitic ( natrolite ) material . Oriented fine needles ( ? aegirine ) are sometimes ob- served in some nepheline grains . Aegirine augite ( ZA c = 52 ° + , X = green , Z = yellowish green ) is ...
... places highly altered to mica- ceous and zeolitic ( natrolite ) material . Oriented fine needles ( ? aegirine ) are sometimes ob- served in some nepheline grains . Aegirine augite ( ZA c = 52 ° + , X = green , Z = yellowish green ) is ...
Contents
A Probable Zone of Carbonatite and Fenitic Rock Association | 7 |
Quantitative Correlation of Cyclic Stratigraphic Sequences | 17 |
On the Fossiliferous Ordovician Rocks of Black Mountain | 35 |
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alkali anomaly apatite Arunachal assemblage associated axial bands Beldih belt Bhutan Bihar biotite bore holes borehole Carbonaceous carbonatite Chaibasa chert chlorite chlorite schist chromite coal seam Coarse sandstone complex contours correlation Dalma Deccan basalts deformation deposits depth developed Dhanjori district Dubrajpur Dubrajpur Formation Eastern exploration F₁ fault feldspars folds foliation fossils geochemical Geol Geological Survey Ghosh gneiss Gondwana grade grains granite gneiss grey Group Hills Himalaya host rock ijolite limestone lineation magnetite Manipur Medium sandstone metamorphism metres migmatites mineralisation minerals muscovite nepheline Northern Shear Zone occur olivine ophiolite phyllites plagioclase Plate plunging Pradesh Precambrian pyrite quartz quartzite regional rock types S₁ S₂ samples sandstone Sarkar schist schistosity sector sedimentary sequence sericite serpentinite shale sillimanite Singhbhum stratigraphic structural studies sulphide Surv Survey of India tectonic texture thickness tholeiites tion trending ultramafic upto veins volcanic