Records of the Geological Survey of India, Volume 113, Part 4The Survey, 1984 - 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 24
... veins . K - feldspar ( perthite ) veins are common within a zone of feldspathic alkali pyroxenite developed along the inner margin of the complex . Carbonatite , mostly sovites , forms ovoid bodies , dykes and veins . Dolomitic ...
... veins . K - feldspar ( perthite ) veins are common within a zone of feldspathic alkali pyroxenite developed along the inner margin of the complex . Carbonatite , mostly sovites , forms ovoid bodies , dykes and veins . Dolomitic ...
Page 25
... veins in pyroxenite and serpentinite within a partial ring - like circular zone in the south- half of the complex ( Plate 3.04 ) . Thin ijolite veins are also common in the feldspathic border zone . Ijolites predominate over melteigite ...
... veins in pyroxenite and serpentinite within a partial ring - like circular zone in the south- half of the complex ( Plate 3.04 ) . Thin ijolite veins are also common in the feldspathic border zone . Ijolites predominate over melteigite ...
Page 26
... veins are less than 10 cm wide and continue for a few metres only ( Plate 3.05 ) . The veins con- sist almost entirely of coarse tabular grains of perthite with little aegirine augite , sphene and apati- te . K - feldspar is often ...
... veins are less than 10 cm wide and continue for a few metres only ( Plate 3.05 ) . The veins con- sist almost entirely of coarse tabular grains of perthite with little aegirine augite , sphene and apati- te . K - feldspar is often ...
Contents
GEOLOGICAL SURVEY OF INDIA | 1 |
Problems of correlation of PreGondwana rock units of Arunachal Pradesh and adjoining areasa review | 15 |
The Abor Group of rocks in Arunachal Pradesh | 48 |
7 other sections not shown
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Common terms and phrases
Abor Volcanic Arunachal Pradesh assemblage associated axial bands basement bedrock beds belt biotite bore holes Buxa carbonatite Chattopadhyay chert chromite coal seam coalfields complex correlation Cretaceous crystalline Daling Darjeeling developed Disangs dykes exploration fault folds Formation Gamnom garnierite geochemical Geol Geological Survey GHOSH gneiss goethite Gondwana Grade grains granite Group Himalayas horizon ijolite Khasi limestone lineaments Lohit Lohit district Manipur Manipur East Maskut Meghalaya metamorphic migmatites mineral Mishmi Naga Hills Nagaland Nandy nepheline Ni-content North Eastern occur ophiolite ophiolite suite overburden phase Phokphur Plate postulated pyroxene pyroxenite quartz quartzite Ranga valley reflected refraction regional river rocks samples sandstone schist seam/s sedimentary sediments sequence serpentinite shale Shillong Siang district sillimanite Sirohi soil profile Sonapahar stratigraphic structural studies sub-surface Subansiri district Sung Valley Survey of India tectonic Tertiary thickness thrust Tidding serpentinites tion trending ultramafics Unpublished GSI Report upto veins zone