Refine your search
Collections
Co-Authors
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Pandey, B. K.
- Rb-Sr Whole Rock Age for Chait Series of Northwestern Himalaya
Abstract Views :165 |
PDF Views:111
Authors
Affiliations
1 Physics Department, Panjab University, Chandigarh, IN
1 Physics Department, Panjab University, Chandigarh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 5 (1978), Pagination: 224-225Abstract
Rb-Sr isochron age of 1430±150 m.y. has been obtained for the gneissic member of Chails exposed near Nirath and Baragaon of Northwestern Himalaya.- Rb-Sr Ages on the Granite and Pegmatitic Minerals from Bastar-Koraput Pegmatite Belt, Madhya Pradesh and Orissa, India
Abstract Views :183 |
PDF Views:1
Authors
Affiliations
1 Atomic Minerals Division, Department of Atomic Energy, Nagpur- 440 001, IN
2 Atomic Minerals Division, Department of Atomic Energy, Bangalore - 560 072, IN
3 Atomic Minerals Division, Department of Atomic Energy, Hyderabad - 500 016, IN
1 Atomic Minerals Division, Department of Atomic Energy, Nagpur- 440 001, IN
2 Atomic Minerals Division, Department of Atomic Energy, Bangalore - 560 072, IN
3 Atomic Minerals Division, Department of Atomic Energy, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 1 (1993), Pagination: 33-38Abstract
isotopic date on 12 samples of the Paliam and Darba granites of the Bastar Craton in Central India have defined an isochron age of 2308 ± 48 Ma. with initial Sr-isolopic ratio of 0.7354 ± 0.0097. Mineral ages on perthite, biolile and muscovite from tin- and rare metal-minearlised as well as non-minearlised pegmatites of the Bastar-Koraput Pegmatite belt within this craton have indicated two important dates of about 2050 and 1620 Ma. These dates are interpreted as (a) emplacement of the granite around 2300 Ma., (b) derivation of the pegmatites from this parent granite around 2050 Ma and (c) reselling of Rb-Srsystem at about 1620 Ma., concomitant with the metamorphic/uplift event in the nearby Eastern Ghats. The very high initial 87Sr/86Sr ratio of 0.735 for granite indicates thai they are crustal derived, possibly from a metasedimentary source.Keywords
Rb-Sr ages, Geochronology, Pegmatitic Minerals, Bastar-Koraput Belt, Madhya Pradesh, Orissa.- Rb-Sr Systematics of Granitoids of the Central Gneissic Complex, Arunachal Himalaya: Implications on Tectonism, Stratigraphy and Source
Abstract Views :177 |
PDF Views:3
Authors
Affiliations
1 Atomic Minerals Division, Department of Atomic Energy, Bangalore-560 072, IN
2 Atomic Minerals Division, Department of Atomic Energy, Hyderabad-500 016, IN
1 Atomic Minerals Division, Department of Atomic Energy, Bangalore-560 072, IN
2 Atomic Minerals Division, Department of Atomic Energy, Hyderabad-500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 1 (1995), Pagination: 51-56Abstract
Precambrian Central Gneissic Complex (CGC) in the Kameng district of Arunachal Pradesh comprises the oldest Sela Group thrusting over the Bomdila Group, with the Salari Group being the youngest. Augen gneiss of the Bomdila Group, granite of the Salari Group and hornblende granite gneiss of the Sela Group define Rb-Sr isochron ages of 1914 ± 23, 1536 ± 60 and 481 ± 23 Ma, respectively. The 481 Ma age on the hornblende gneiss from the oldest Sela Group is attributed to the resetting of Rb-Sr clock due to tectonic imprint of the Main Central Thrust (MCT). The 1914 Ma age of the augen gneiss, the oldest reported so far from the Arunachal Himalaya, is either the emplacement age or latest metamorphic event. The 1536 Ma old emplacement age of the granite intruding the black shale of the Salari Group disproves the hitherto considered Gondwana age for the black shale, and, thus, necessitates revision in its chronostratigraphy. (87Sr/86Sr)i of the hornblende granite gneiss and Salari granite is high (0.719 and 0.709) indicating a crustal source for these, whereas it is low for the augen gneiss (0.703) suggesting an inherited signature of the upper mantle source together with some crustal contamination. Rb-Sr whole-rock isochron ages from the Arunachal Himalaya are correlatable with those reported from other parts of the Indian Himalaya. These cumulatively point to at least three major periods of activity in the Himalaya at ca. 2060 ± 250, 1530 ± 90 and 530 ± 75 Ma.Keywords
Rb-Sr Whole-Rock Ages, Geochronology, Central Gneissic Complex, Arunachal Himalaya.- Geochronology (Rb-Sr, Sm-Nd and Pb-Pb) of the Proterozoic Granulitic and Granitic Rocks around Usilampatti, Madurai District, Tamil Nadu: Implication on Age of Various Lithounits
Abstract Views :209 |
PDF Views:2
Authors
Affiliations
1 Atomic Minerals Directorate Geochronology Lab , Begumpet, Hyderabad - 500 016, IN
2 Atomic Minerals Directorate, Pratap Nagar, Sanganer, Jaipur - 303 906, IN
3 Atomic Minerals Directorate, Khasmahal, Tatanagar - 831 002, Jharkhand, IN
1 Atomic Minerals Directorate Geochronology Lab , Begumpet, Hyderabad - 500 016, IN
2 Atomic Minerals Directorate, Pratap Nagar, Sanganer, Jaipur - 303 906, IN
3 Atomic Minerals Directorate, Khasmahal, Tatanagar - 831 002, Jharkhand, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 5 (2005), Pagination: 539-551Abstract
Rb-Sr, Sm-Nd and Pb-Pb systematics on mafic granulites, intermediate-charnockites, charnockites, calcgranulites, orthogneisses, leptynites, granites and two (2) mineral samples (microcline and muscovite) from pegmatite have been studied Sm-Nd model ages (TDM) for most of the rocks cluster around 2 1 Ga Calc-Granulites gave Rb-Sr whole rock isochron age of 1339 ± 110 Ma with initial 87sr/86sr ratio(I R ) = 0 709 Mesoproterozoic age for the Metasedimentary. Group of rocks (calc-granulites) has been inferred based on their 87sr/86sr ratio also. Granites and leptynites have yielded Rb-Sr whole rock isochron ages of 823 ± 38 Ma, with I R = 0 713 and 894 ± 82 Ma, with I R = 0 708 respectively which are younger than the calc-Granulites. Microcline and muscovite from pegmatite gave Rb-Sr model ages as 532 and 491 Ma respectively. Granites, leptynites and calc-Granulites are derived from the crustal source as indicated by their high initial 87sr/86sr ratios. Most probably the protolith of the granitic and granulitic rocks is of Palaeoproterozoic age in this part of the Madurai Block. The minimum age of granulite grade of metamorphism has been inferred at c 850 Ma, indirectly on the basis of Rb-Sr ages of leptynites, which normally form during the evolution of granulite facies assemblages. Both granulite facies metamorphism and granitic magmatism probably took place during Neoproterozoic period correlatable to the early phase of Pan-African orogeny. Later decompression, causing mineral scale resetting of the Rb-Sr and Sm-Nd systematics, around 450-550 Ma, may correspond to the final exhumation, which brought the middle to lower crustal granulites to upper crustal levels, during the last phase of Pan-African activity. As per ages obtained on various lithounits in the present study the Metasedimentary Group of rocks (Mesoproterozoic) are younger than the Charnockite Group of rocks (Palaeoproterozoic) followed by the rocks belonging to the Migmatite Complex (Neoproterozoic).Keywords
Rb-Sr, Sm-Nd, Pb-Pb Geochronology, Proterozoic, Granulites, Age, Lithounits Usilampatti, Madurai, Tamil Nadu.- Geochemistry and Rb-Sr Age of the Late Proterozoic Godhra Granite of Central Gujarat, India
Abstract Views :189 |
PDF Views:2
Authors
Affiliations
1 Atomic Minerals Directorate For Exploration and Research, Jamshedpur-831 002, IN
2 Atomic Minerals Directorate For Exploration and Research, Jamshedpur-831 002
3 Atomic Minerals Directorate For Exploration and Research, New-Delhi-110 066, IN
4 Atomic Minerals Directorate For Exploration and Research, Hyderabad-500 016, IN
1 Atomic Minerals Directorate For Exploration and Research, Jamshedpur-831 002, IN
2 Atomic Minerals Directorate For Exploration and Research, Jamshedpur-831 002
3 Atomic Minerals Directorate For Exploration and Research, New-Delhi-110 066, IN
4 Atomic Minerals Directorate For Exploration and Research, Hyderabad-500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 5 (2001), Pagination: 391-398Abstract
The Precambrian Godhra Granite occurring in parts of central Gujarat, intrudes the metasediments of Lunavada and Champaner Groups. RbSr isochron based on 14 whole rock samples of the Godhra Granite gives an age of 965±40 Ma, with an initial 87Sr/87Sr ratio of 0.7109±0.0015. Geochemical data indicate its origin by partial melting of crustal rocks in post-orogenic environment.Keywords
Godhra Granite, Peraluminous Granite, Rb-Sr Isochron, Crustal Source, Gujarat.- Geochronological (Rb-Sr and Sm-Nd) Studies on Intrusive Gabbros and Dolerite Dykes from Parts of Northern and Central Indian Cratons: Implications for the Age of Onset of Sedimentation in Bijawar and Chattisgarh Basins and Uranium Mineralisation
Abstract Views :209 |
PDF Views:1
Authors
U. K. Pandey
1,
D. V. L. N. Sastry
1,
B. K. Pandey
1,
Madhuparna Roy
2,
T. P. S. Rawat
2,
Rajeeva Ranjan
3,
V. K. Shrivastava
3
Affiliations
1 Atomic Mineral Directorate for Exploration and Research, Geochronology Lab., Begumpet, Hyderabad - 500 016, IN
2 Atomic Mineral Directorate for Exploration and Research, Northern region, New Delhi - 110 066, IN
3 Atomic Mineral Directorate for Exploration and Research, Central Region, Nagpur - 440 001, IN
1 Atomic Mineral Directorate for Exploration and Research, Geochronology Lab., Begumpet, Hyderabad - 500 016, IN
2 Atomic Mineral Directorate for Exploration and Research, Northern region, New Delhi - 110 066, IN
3 Atomic Mineral Directorate for Exploration and Research, Central Region, Nagpur - 440 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 1 (2012), Pagination: 30-40Abstract
The Dargawan gabbros intrusive into the Moli Subgroup of Bijawar Group, yielded Rb-Sr whole rock isochron age of 1967 ± 140 Ma. Based on the oldest age from overlying Lower Vindhyan (1.6Ga) and the underlying youngest basement ages (2.2 Ga), the time range of Bijawar sedimentation may be assigned as 2.1-1.6 Ga (Paleoproterozoic). Sm-Nd Model ages (TDM), obtained, for Dargawan gabbros, is c. 2876 - 3145 Ma. High initial 87Sr/ 86Sr ratio of 0.70451 (higher than the contemporary mantle) and negative εNdi (at 1.9 Ga) value of -1.5 to -4.5, indicate assimilation of Archaean lower crustal component by the enriched mantle source magma at the time of gabbroic intrusion. The dolerite, from Damdama area, which is intrusive into the basement and overlying sediments of Chandrapur Group in the central Indian craton, yielded Rb-Sr internal isochron age of 1641 ± 120 Ma. The high initial 87Sr/86Sr ratio of 0.7098 and εNdi value of -3.5 to -3.7 (at 1.6 Ga) is due to contamination of the mantle source magma with the overlying sediments. These dolerites have younger Sm-Nd Model ages (TDM) than Dargawan gabbros as c. 2462 - 2675 Ma, which is similar to the age of the Sambalpur granite, from which probably sediments to this part of Chattisgarh basin are derived. Hence mixing of sediments with the Damdama dyke during its emplacement, gives rise to high initial 87Sr/86Sr and low initial 143Nd/144 ratios for these dykes. The c. 1600 Ma age indicates minimum age of onset of the sedimentation in the Chandrapur Group of Chattisgarh basin. Both the above mafic intrusions might have taken place in an intracratonic rift related (anorogenic) tectonic setting. This study is the first reliable age report on the onset of sedimentation in the Chandrapur Group. The total minimum time span of Chandrapur and Raipur Group may be 1.6 Ga to 1.0 Ga (Mesoproterozoic). The unconformably underlying Shingora Group of rocks of Chhattisgarh Supergroup thus indicates Paleoproterozoic age (older than 1.6 Ga). Most part of the recently classified Chattisgarh Supergroup and Bijawar- Vindhyan sequence are of Mesoproterozoic-Paleoproterozoic age and not of Neoproterozoic-Mesoproterozoic age as considered earlier. Petrographic study of basic dykes from Damdama area (eastern margin of Chattisgarh Supergroup) indicated presence of primary uranium mineral brannerite associated with goethite. This is the evidence of mafic intrusive providing geotherm and helping in scavenging the uranium from the surrounding and later alterations causing remobilisation and reconcentration of pre-existing uranium in host rocks as well as in mafic dyke itself otherwise mafic rocks are poor source of uranium and can not have primary uranium minerals initially. It can be concluded that mafic dykes have role in uranium mineralisation although indirectly.Keywords
Geochronology, Age of Sedimentation, Uranium Mineralisation, Northern and Central Indian Cratons.References
- BASU, A., PATRANABIS-DEB, S., SCHIEBER, J. and DHANG, P. C. (2009) Stratigraphic position of the 1000 Ma Sukhda Tuff (Chhattisgarh Supergroup, India) and the 500 Ma question. Precambrian Res., v.167, pp.383-388.
- BHASKAR RAO, Y.J., PANTULU, G.V.C., REDDY, V.D. and GOPALAN, K. (1995) Time of early sedimentation and volcanism in the Proterozoic Cuddapah basin, South India: evidence from RbSr age of Pulivendla mafic sill. Mem. Geol. Soc. India, no.33, pp. 329-338.
- CHALAPATHI RAO, N.V., LEHMANN, B., BURGESS, R., PANDE, S.K. and HARI, K.R.M. (2010) Mafic dykes of Deccan age in the Chhattisgarh (Mesoproterozoic) Basin, Central India: implications for the origin and original spatial extent of the Deccan. www.largeigneousprovinces.org
- CHOUDHURY, A. K., NAIK, A., MUKHOPADHYAY, D. and GOPALAN, K.(1996) Rb-Sr dating of Sambalpur granodiorite, western Orissa. Jour. Geol. Soc. India, v.47(4), pp.503-506.
- CRAWFORD, A.R. (1970) The Precambrian geochemistry of Rajasthan and Bundelkhand, Northern India. Can. Jour. Earth Sci., v.125, pp.91-110.
- DAS, D.P., KUNDU, A., DAS, N., DUTTA, D.R., KUMARAN, K., RAMAMURTHY, S., THANAVELU, C. and RAJAIYA, V. (1992) Lithostratigraphy and Sedimentation of Chhattisgarh basin. Indian Minerals, v.46, no.3&4, pp.271-288.
- DEPAOLO, (1981) Trace element and isotopic effects of combined wallrock assimilation and fractional crystallization. Earth Planet. Sci. Lett., v.53, pp.189-202.
- DOBMEIER, C.J. and RAITH, M. M. (2003).Crustal architecture and evolution of the eastern Ghats Belts and adjacent regions of India. In: M. Yoshida, B.F. Windley, and S. Dasgupta (Eds.), Proterozoic East Gondwana: supercontinent assembly and breakup. Geol. Soc. London, Spec. Pub., v.206, pp.145-168.
- FACHMANN, S.(2001) Geologische Entnicklung im Umfeld des Mahanadi Riftes (Indien). Ph.D. theses, Technische Universitat Bergakademie Freiberg, Germany.
- FOGWILL, W.D. (1981) Canadian and Saskatchewan uranium deposits: compilation, metallogeny, models, exploration. In: T.I.I. Sibbald and W. Petruk (Eds.), Geology of Uranium deposits, C.I.M. Special volume, v.32, pp.3-19.
- FRENCH, J.E., HEAMAN, L.M., CHACKO, T., SRIVASTAVA, R.K.and SINGH, R.K. (2004) U-Pb dating of mafic dyke swarms of the Bastar craton, India. Geochim Cosmochim Acta, v.68 (11, Suppl.) A586.
- FRENCH, J.E., HEAMAN, L.M., CHACKO, T. and SRIVASTAVA, R.K. (2008) 1891-1883 Ma Southern Bastar-Cuddapah mafic igneous events, India: a newly recognized large igneous province. Precambrian Res. v.,160, pp. 308-322
- GUPTA, P.K., RAJEEVA RANJAN, MUKUNDAN, A.R., DESHPANDE, M.S.M., SRIVASTAVA, V.K. and YADAV, R.S. (2008) Uranium mineralisation along the northeastern margin of Proterozoic Chhattisgarh basin around Chitakhol, Central India: A petromineralogical study. Explo. Res. Atom. Min., v.18, pp.3353.
- KUMAR, B., SRIVASTAVA, R.K., JHA, D.K., PANT, N.C. and BHANDARU, B.K. (1990) A revised stratigraphy of the rocks of type area of the Bijawar Group in Central India. Indian Minerals, v.44, no.4, pp.303-314.
- LUDWIG, K.R. (1993) ISOPLOT- A plotting and regression program for radiogenic-isotope data version 2.70. USGS open file report 91-445, 42p.
- MILOS RENE (2008) Anomalous rare earth element, yttrium and zirconium mobility associated with uranium mineralisation. Terra Nova, v.20(1), pp.52-58.
- MONDAL, M.E.A., SHARMA, K.K., RAHMAN, A. and GOSWAMI, J.N. (1998) Ion microprobe 207Pb/ 206Pb zircon ages for gneissgranitoid rocks from Bundelkhand massif: Evidence for Archaean component. Curr. Sci., v.74, no.1, pp.70-75.
- MONDAL, M.E.A., GOSWAMY, J.N., DEOMURARI, M.P. and SHARMA ,K.K. (2002) Ion microprobe 207Pb/206Pb ages of zircons from the Bundelkhand massif, northern India: implications for crustal evolution of the Bundelkhand-Aravalli protocontinent. Precambrian Res., v.117, pp.413-419.
- MURTI, K.S. (1987). Sedimentation in Chhattisgarh basin. In Purana Basins of Peninsular India. Mem. Geol. Soc. India, no.6, pp.239-260.
- PANDEY, B.K., CHABRIA, T. and GUPTA, J.N.(1995) Geochronological characterisation of the Proterozoic terrains of Peninsular India: relevance to the first order target selection for uranium exploration. Explo. Res. Atom. Min., v.8, pp.187-213.
- PANDEY, B.K., GUPTA, J.N., SARMA, K.J. and SASTRY, C.A. (1997) Sm-Nd, Pb-Pb and Rb-Sr geochronology and petrogenesis of the mafic dyke swarm of Mahbubnagar, South India: implications for Paleoproterozoic crustal evolution of the Eastern Dharwar Craton. Precambrian Res., v.84, pp.181-196.
- PANDEY, B.K., KRISHNA, V., PANDEY, U.K. and SASTRY, D.V.L.N. (2009) Radiometric dating of uranium mineralisation in the Proterozoic basins of eastern Dharwar craton, South India. Proceedings of the International conference on peaceful uses of Atomic Energy, New Delhi, India, v.1, pp.116-117.
- PANDEY, U.K., BABU, E.V.S.S.K., KRISHNAMURTHY, P. and CHABRIA TIKAM (1998) Mineral-chemical study of chevkinite and allanite from granitic rocks of Madurai block, Tamil Nadu, India: implications for REE-Ti mobility in granitic system. Abstract Miner. Soc. India, National Seminar 18.
- PANDEY, U.K., BHATTACHARYA, D., SASTRY, D.V.L.N. and PANDEY, B.K. (2011) Geochronology (Rb-Sr, Sm-Nd and Pb-Pb), isotope geochemisty and evolution of the granites and andesites hosting Mohar Cauldron, Bundelkhand Granite Complex, Shivpuri district, Central India. Explo. Res. Atom. Min., v.21, (in press).
- PATRANABIS-DEB, S., BICKFORD, M.E., HILL, B., CHAUDHURI, A.K. and BASU, A. (2007) SHRIMP ages of zircon in the uppermost tuff in Chattisgarh Basin in central India require 500 Ma adjustment in Indian Proterozoic stratigraphy. Jour. Geol., v.115, pp.407-415.
- PETER SORJONEN and WARD OLLI ÄIKÄS (2008) Structural framework and event history relevant to uranium mineralization near the Paleoproterozoic-Archean unconformity in eastern Finland (Geological Survey of Finland). Internat. Geol. Cong. Oslo.
- SARKAR, A., TRIVEDI, J.R., GOPALAN, K., SINGH, P.N., DAS, A.K. and PAUL, D.K. (1984) Rb-Sr geochronology of Bundelkhand granitic complex in the Jhansi-Babina-Talbehat sector, U.P., India. Indian Jour. Earth Sci., CEISM Seminar Volume, pp.6472.
- SARKAR, A., GHOSH, S., SINGHAI, R.K. and GUPTA, S.N. (1997) RbSr geochronology of the Dargawan sill: constrain on the age of the type Bijawar sequence of Central India. Int. Con. Iso. in Solar system. Nov. 11-14(Abs vol), pp.100-101.
- SARANGI, S., GOPALAN, K. and KUMAR, S. (2004) Pb-Pb age of earliest megascopic, eukaryotic algae bearing Rohtas Formation, Vindhyan Supergroup, India: implications for Precambrian atmospheric oxygen evolution. Precambrian Res., v.132, pp.107-121.
- SINHA, R.M., SRIVASTAVA, V.K., SARMA, G.V.G. and PARTHASARTHY, T. N. (1995) Geological favourability for unconformity related uranium deposits in northern margins of Cuddapah basin: Evidences from Lambapur uranium occurrences, Andhra Pradesh, India. Explo. Res. Atom. Min., v.8, pp.111-126.
- SINHA, D.K. and JAIN, S.K. (2008) Uraniferous rhyolitic vein in the basement fractures of Singhora protobasin, near Juba village, Raipur district, Chhattisgarh. Explo.Res. Atomic Minerals, v.18, pp.119-124.
- SRIVASTAVA, R.K. and GAUTAM, G.C. (2009) Precambrian Mafic Magmatism in the Bastar Craton, Central India. Jour. Geol. Soc. India, v.73, pp.52-72.
- SUBBA RAO, D.V., NAQVI, S. M., BALARAM, V., CHARAN, S. N. and SRIDHAR, D. N. (2003) Subcrustal magmatic activity in and around the Meso-Neoproterozoic Chattisgarh basin in Bastar craton of Central India: Implications for the nature of subcontinental lithosphere. In: Abhinabha Roy and D.M. Mohabay (Eds.), Advances in Precambrian of Central India. Gondwana Geol. Mag. Spec., v.7, pp.261-277.
- SUBBA RAO, D.V., BALARAM, V., CHARAN, S.N., SRIDHAR, D.N. and NAQVI, S.M. (2004) Petrology, geochemistry and petrogenesis of mafic dykes in and around Chattisgarh Basin, Central India: Implications for the compositional variations in the mantle sources. DST-DCS NL, v.14, no.2, pp.2-5.
- WOLFGANG BACH and WOLFGANG IRBER (1998) Rare earth element mobility in the oceanic lower sheeted dyke complex: evidence from geochemical data and leaching experiments. Chem. Geol., v.151, no.1-4, pp.309-326.