Records of the Geological Survey of India, Volume 113, Parts 4-6The Survey, 1980 - 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 26
... appears to be due to extensive replacement of pyroxenite by ijolite giving rise to melteigite and alkali pyroxenite ( urtite - ijolite - meltei- gite - pyroxenite : 0-30-70-90-100 as mafic limits , after King and Sutherland , 1966 ) ...
... appears to be due to extensive replacement of pyroxenite by ijolite giving rise to melteigite and alkali pyroxenite ( urtite - ijolite - meltei- gite - pyroxenite : 0-30-70-90-100 as mafic limits , after King and Sutherland , 1966 ) ...
Page 31
... appears to be later introduced . However some carbonates which form coarse interlocking gra- ins in ijolite may be of primary origin . Carbona- te - silicate phase is generally absent though mica - car- bonate rocks are frequent in the ...
... appears to be later introduced . However some carbonates which form coarse interlocking gra- ins in ijolite may be of primary origin . Carbona- te - silicate phase is generally absent though mica - car- bonate rocks are frequent in the ...
Page 49
... appears to have been exsolved . Pyrite is possibly the next mineral to have been depo- sited but there is no physical contact between pyrite and pyrrhotite . Chalcopyrite is definitely But bet . younger than both pyrite and pyrrhotite ...
... appears to have been exsolved . Pyrite is possibly the next mineral to have been depo- sited but there is no physical contact between pyrite and pyrrhotite . Chalcopyrite is definitely But bet . younger than both pyrite and pyrrhotite ...
Contents
Part | 1 |
Problems of correlation of PreGondwana rock units of Arunachal Pradesh and adjoining areasa review | 15 |
The Sung Valley alkaline ultramafic carbonatite complex East Khasi and Jaintia Hills districts Meghalaya | 24 |
Copyright | |
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Common terms and phrases
alluvium anorthosite assemblage associated augite bands basalt flows basin beds belt biotite Bombay bore holes borehole calcite carbonatite Charnockite chert chlorite chromite clay clinopyroxene coal complex Deccan Trap deposits developed district drainage dykes emplaced fault felspar fluorite folds Formation fossil fragments gabbro geochemical Geol Geological Survey geomorphic gneisses Gondwana grade grains granite granulites greisens grey groundmass Group hill Himalayas ijolite indicated intrusive laterite layers limestone magnetite Manipur mapping Meghalaya metamorphic metres migmatites mineralisation minerals Narmada occur olivine opaque ophiolite phenocrysts phosphorite phyllite plagioclase Plate porphyritic Pradesh present pyroclastic pyroxene pyroxenite quartz quartz veins quartzite region river rocks samples sandstone schist seam sedimentary sediments sequence serpentinite shale sillimanite soil stratigraphic structure studies sub-surface surface Surv Survey of India Tapti tectonic thickness thin tion trending tuff ultramafic Unpublished GSI Report upto Vaghur valley volcanic zone