Records of the Geological Survey of IndiaGeological Survey of India, 1887 - 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 27
... felspar and felspathic material scattered about in the matrix , gave me the idea of a rock produced by the degradation of felsites or granitic rocks and produced perhaps during a time of intermittent volcanic activity . North of ...
... felspar and felspathic material scattered about in the matrix , gave me the idea of a rock produced by the degradation of felsites or granitic rocks and produced perhaps during a time of intermittent volcanic activity . North of ...
Page 29
... felspar , with sometimes a predominance of the former ; there are pale and black micas ; and there are schorl crystals , developed here and there , and occurring abundantly in cracks and veins , just as they did in the gneissose granite ...
... felspar , with sometimes a predominance of the former ; there are pale and black micas ; and there are schorl crystals , developed here and there , and occurring abundantly in cracks and veins , just as they did in the gneissose granite ...
Page 30
... felspar is not so abundant as in a typical granite or gneiss , occurring in less quantity than the quartz ; it is decomposed almost beyond recogni- tion . Biotite is fairly represented , and there are a few needles of apatite . Whether ...
... felspar is not so abundant as in a typical granite or gneiss , occurring in less quantity than the quartz ; it is decomposed almost beyond recogni- tion . Biotite is fairly represented , and there are a few needles of apatite . Whether ...
Page 31
... felspar is in the same condition as that of the Banale river gneiss . The mica is biotite as before , sometimes dark brown , but often quite black , and opaque in thin slices . The granitic mass in its upper parts seemed to change ...
... felspar is in the same condition as that of the Banale river gneiss . The mica is biotite as before , sometimes dark brown , but often quite black , and opaque in thin slices . The granitic mass in its upper parts seemed to change ...
Page 44
... felspar crystals appears to me to be due to segregation having taken place in an imperfectly plastic mass , and not to have had its origin in the solvent action of an igneous matrix . The felspar contains no inclusions of the matrix ...
... felspar crystals appears to me to be due to segregation having taken place in an imperfectly plastic mass , and not to have had its origin in the solvent action of an igneous matrix . The felspar contains no inclusions of the matrix ...
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Common terms and phrases
Afghanistán anticlinals appears augite Bág Band Bawar beds belong Blaini Blanford Bose boulders Calcutta carboniferous Cenomanian character Chirákhán Chor clay closely allied coal Coal-field colour conglomerate crystalline crystals Deccan traps deposits Dudatoli east eocene feet felspar Flsc foliation fossils fragments genus Geol Geological Survey gneiss gneissose granite Gondwana Haibak hills Himalayas Hindu Kush horizon hornblende igneous rocks Indian Museum Jaunsar jurassic Kúsh latter limestone lower magnetite mandible Marl metamorphism mica microscope miles mineral miocene molars namadicus neocomian numerous nummulitic occur outcrop Outer formations palæindicus Perim Island pliocene porphyritic present Punjab quartz quartzites range ridge river Royal 8vo sandstone schistose schistose series schists seam seen shales Simla sivalensis Siwalik slates slices Society species specimens strata stream structure Survey of India tertiary thickness traps Turán Turkistán unconformity upper cretaceous valley volcanic XVII XVIII
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Page 203 - ... or a granite-porphyry ; when, in the course of the earth-movements that were contorting, crumpling, and folding the strata of the Himalayas, this imperfectly consolidated graniteporphyry was forced through the faults that had been formed along the axes of over thrust-folds ; the semi-plastic mass was subjected to enormous pressure ; the mica was crumpled ; the crystals of felspar were cracked and ruptured...