Records of the Geological Survey of India, Volume 123, Part 2The Survey, 1990 - 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 25
... gneisses , migmatitic rocks and porphyroblastic hypersthene granite ( charnockite ) .Numerous enclaves of masic granu- lites are seen in the granite gneisses . The charnockitic rocks are distinctly granoblas- tic with quartz ...
... gneisses , migmatitic rocks and porphyroblastic hypersthene granite ( charnockite ) .Numerous enclaves of masic granu- lites are seen in the granite gneisses . The charnockitic rocks are distinctly granoblas- tic with quartz ...
Page 32
... gneisses occur in the form of enclaves within the younger K- feldspar rich granitoids ( Fig . 1 ) . A suite of samples of the latter defined an " errorchron " , age of 2095 +118 Ma with initial 87 Sr / 86 Sr of 0.743 . The older ...
... gneisses occur in the form of enclaves within the younger K- feldspar rich granitoids ( Fig . 1 ) . A suite of samples of the latter defined an " errorchron " , age of 2095 +118 Ma with initial 87 Sr / 86 Sr of 0.743 . The older ...
Page 97
... gneissic suite , which forms the basement , is mainly represented by interlayered units of para - and ortho - gneisses . These gneisses have been distin- guished primarily on the field and petrographic aspects . The paragneisses are ...
... gneissic suite , which forms the basement , is mainly represented by interlayered units of para - and ortho - gneisses . These gneisses have been distin- guished primarily on the field and petrographic aspects . The paragneisses are ...
Contents
Geochronology and Isotope Geology Division 1833 | 18 |
Central Petrological Laboratories 4450 | 44 |
Central Geophysics Division 5168 | 50 |
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aeromagnetic amphibolite AMSE Wing analysis ANDHRA PRADESH anomalies Argada bands Barakar Barakar Formation Barren Measures Formation basin Bhutan BIHAR block boreholes Calcutta Central chalcopyrite chemical clay coal seams Coal Wing copper cores correlation cruise depth developed DISTRICT dolomite dykes east eastern EXPLORATION FOR COAL fault field season geochemical GEOLOGICAL MAP Geophysics Division gneisses GODAVARI VALLEY Gondwana grade grained granite gneiss grey GROUND EVALUATION heavy mineral horizon India indicated intersected isotopic Kamthi Formation Karnataka lignite limestone located MADHYA PRADESH mafic magnetic Marine Wing metamorphic migmatites million tonnes mineralisation NW-SE occur Orissa phyllite PRADESH Code Precambrian quartz quartzite range Raniganj REGIONAL EXPLORATION revealed samples sand sandstone scale schist seam zones sector sediments seismic sequence shale sq km sulphide surface surveys TALCHIR FORMATION thickness tion toposheet trending upto VALLEY COALFIELD varying vibrocores volcanics WEST BENGAL whole rock zone