Records of the Geological Survey of India, Volume 117, Part 2The Survey, 1986 - 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 92
... veins of quartz . Mapping by the author reveal that in this massif of 26,000 sq km , there are 11 major quartz reefs spaced at 12.5 km to 19 km apart with average widths of 50 m to 60 m and lengths of 35 km to 40 km . The longest body ...
... veins of quartz . Mapping by the author reveal that in this massif of 26,000 sq km , there are 11 major quartz reefs spaced at 12.5 km to 19 km apart with average widths of 50 m to 60 m and lengths of 35 km to 40 km . The longest body ...
Page 100
... quartz - feldspar ( ? ) pegmatite veins ; and ii ) the NNE - SSW trending reef is practically barren . At Gorahri ... reefs except for green which is not found in the quartz reefs . In one instance , it is noticed that a coloured ...
... quartz - feldspar ( ? ) pegmatite veins ; and ii ) the NNE - SSW trending reef is practically barren . At Gorahri ... reefs except for green which is not found in the quartz reefs . In one instance , it is noticed that a coloured ...
Page 101
... reefs and the medium to fine grained Kabrai Leucogranite provide good quality blocks and ballasts . The latter bodies , however , are small and isolated , making large scale work difficult . However , the demand for granite and quartz ...
... reefs and the medium to fine grained Kabrai Leucogranite provide good quality blocks and ballasts . The latter bodies , however , are small and isolated , making large scale work difficult . However , the demand for granite and quartz ...
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Common terms and phrases
albite amphibolite amphibolite facies aureole Babina banded iron-formation Basu Batholith Berwar Bijawar biotite bodies Bundelkhand Bundelkhand granitic massif Bundelkhand massif chlorite composition conglomerate country rocks crystals developed dips dolerite dykes emplacement enclaves esmeraldite exhibit feature feldspar folds foliation formation garnet Geol GEOLOGICAL SURVEY gneisses Gneissic Complex grade grained granite granite granitic rocks granitoid groundmass H₂O hornblende inclusions INDIA Records indicate intrusive Jhansi granite Jhararghat K-feldspar Kabrai Karesra Karitoran lamellae leucogranite magmatic magnetite Mahroni mapped Mau Ranipur megacrysts metabasic metamorphism microcline migmatites minerals muscovite Mylliem Mylliem Pluton myrmekite occur outcrops parallel pegmatite perthite phenocrysts plagioclase pluton porphyritic porphyritic coarse grained porphyritic granites Precambrian pyrophyllite quartz quartz reefs quartz-sericite rock quartzites recrystallization relict samples schist schistose sedimentary sediments sericite shear Shillong Group Shillong rocks Shillong Series South Khasi Batholith sphene strike structural suggest SURVEY OF INDIA syenitic textural trending twins upto veins xenoliths zone