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 22
... ratio ( 3.64 to 8.75 ) is due to enhancement of Zr content during fractional crystallisation . In Kolar , all the categories of dyke swarms dis- play slight negative Eu anomaly ( Eu / Eu = 0.61 to 0.93 ) implying separation of ...
... ratio ( 3.64 to 8.75 ) is due to enhancement of Zr content during fractional crystallisation . In Kolar , all the categories of dyke swarms dis- play slight negative Eu anomaly ( Eu / Eu = 0.61 to 0.93 ) implying separation of ...
Page 24
... ratio of 0.710740 ± 0.000294 ( MSWD = 5.44 ) ( Fig . 2 ) . It is believed to be the crystallisation age of the granite and the high initial Sr ratio suggests a crustal origin . -750 78.0 740 PORPHYRITIC GRANITE SOUTH KHASI BATHOLITH ...
... ratio of 0.710740 ± 0.000294 ( MSWD = 5.44 ) ( Fig . 2 ) . It is believed to be the crystallisation age of the granite and the high initial Sr ratio suggests a crustal origin . -750 78.0 740 PORPHYRITIC GRANITE SOUTH KHASI BATHOLITH ...
Page 28
... ratio of 0.73377 ± 0.00819 ( MSWD = 0.43 ) . The age data signify an anatectic event which led to the formation of the migmatitic granite diapir . The high initial 87 Sr / 86 Sr ratio of the granite imply involvement of crustal sources ...
... ratio of 0.73377 ± 0.00819 ( MSWD = 0.43 ) . The age data signify an anatectic event which led to the formation of the migmatitic granite diapir . The high initial 87 Sr / 86 Sr ratio of the granite imply involvement of crustal sources ...
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