Records of the Geological Survey of India, Volume 114, Part 5The Survey, 1982 - 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 12
... ( Composition is predominantly of gamma - MnO2 type ; Naganna , 1977 ) . Radicals ( % ) Stratiform Podform Tabular ( 1 ) Tabular ( II ) MnO2 81.21 64.23 50.26 12.37 Manganite 9-10 % ( statistical variance 8.93 ) MnO 4.16 9.06 8.69 32.59 ...
... ( Composition is predominantly of gamma - MnO2 type ; Naganna , 1977 ) . Radicals ( % ) Stratiform Podform Tabular ( 1 ) Tabular ( II ) MnO2 81.21 64.23 50.26 12.37 Manganite 9-10 % ( statistical variance 8.93 ) MnO 4.16 9.06 8.69 32.59 ...
Page 62
... composition is oligoclase - andesine in range . The more sodic nature of the plagioclase may be due to change in felspar composition from calcic to sodic , as a result of metamorphic recrystallisation and mig- matisation . Plagioclase ...
... composition is oligoclase - andesine in range . The more sodic nature of the plagioclase may be due to change in felspar composition from calcic to sodic , as a result of metamorphic recrystallisation and mig- matisation . Plagioclase ...
Page 68
... composition of the plagioclase might have been more calcic , but it has been brought down towards sodic end by the retrogressive metamorphism which these rocks have undergone . This metamorphic downgrading is accompanied by the ...
... composition of the plagioclase might have been more calcic , but it has been brought down towards sodic end by the retrogressive metamorphism which these rocks have undergone . This metamorphic downgrading is accompanied by the ...
Contents
A genetic model for the Sandur manganese ores RN Mishra | 10 |
A note on the intertrappean stratigraphy of Gandhari Kamareddi and Ramayampet areas Nizamabad 19 | 19 |
On the high grade schistose rocks equivalent to the Sargur schist complex in Kasaragod taluk | 31 |
Copyright | |
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alteration Andhra Pradesh anorthosite anorthositic rocks apatite Archaean ascomata Attapadi Barakar Formation bauxite bauxite deposits belt biotite borehole Cannanore Cannanore district charnockite Chlorite chrysoberyl clay coal seams coal-sand ratio colour contours corundum Cuddapah Basin diopside emerald Ephesite facies feldspar fibrous quartz foliation fossil gabbro garnet garnetiferous sillimanite gneiss gem tracts gemstones Geol Surv Ind Geological Survey gneiss grains granite granulite green high grade hornblende idiomorphic magnetite crystals Intertrappean bed iolite iron isopach Jour Geol Kabbani Karnataka Kerala Krishna kyanite laterite lignite lineament lithofacies lithological magnetite manganese Margarite massif metamorphism migmatite minerals moonstone Mysore Nair number of coal occur ostiole pegmatite Perinthatta plagioclase planation surfaces pollen pyroxene quartz quartzite Ramanujam ratio map regional ruby samples sand Sandur sapphire Schist sedimentary sediments sillimanite South southern strand plain stratiform stratigraphic Survey of India taluk Tamil Nadu tectonic Tertiary thickness trend upto Warkalli Wynad zircon