- S. M. Naqvi
- S. M. Hussain
- K. V Subbarao
- Rahul Baldota
- S. R. Suresh
- P. T. Sastri
- A. S. Kulageri
- B. R. Nagabhushan
- D. S. Sarma
- D. V. Subbarao
- S. Nirmal Charan
- T. C. Devaraju
- R. P. Viljoen
- T. L. Sudhakara
- M. G. Omkesh Murthy
- S. Vijaya Kumar
- R. G. Vijaya Vikram
- Fareeduddin
- D. Srinivasa Sarma
- M. Ram Mohan
- J. G. Rana Prathap
- S. Viswanathan
- S. N. Charan
- D. V. Subba Rao
- V. N. Vasudev
- V. Balaram
- G. V. Rao
- P. Krishnamurthy
- K. R. Gupta
- D. V. Pichamuthu
- M. S. Rao
- K. S. Godhavari
- C. V. Raman
- V. R. Hegde
- R. Vaidyanadhan
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
Sawkar, R. H.
- Proceedings of the 25th Annual General Meeting of the Geological Society of India Held on 3rd April 1984 at the Premises of the Geological Survey of India Training Institute, Chitradurga at 4.30 P.M.
Authors
1 Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 6 (1984), Pagination: 390-391Abstract
No Abstract.Full Text
- Group Discussion on the Chitradurga Schist Belt
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 6 (1984), Pagination: 399-400Abstract
No Abstract.Full Text
- Presentation of Prof. M. R. Srinivasa Rao Award to Prof. R. K. Lal
Authors
1 Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 9 (1985), Pagination: 690-690Abstract
No Abstract.Full Text
- Proceedings of the 27th Annual General Body Meeting of the Geological Society of India Held On 9th March, 1986 at the Indian School of Mines, Dhanbad, Bihar at 4-00 P.m.
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 6 (1986), Pagination: 543-544Abstract
No Abstract.Full Text
- Nominations for Prof. M. R. Srinivasa Rao Award
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 4 (1986), Pagination: 342-342Abstract
No Abstract.Full Text
- Proceeclings of the 29th Annual General Body Meeting
Authors
1 Jammu, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 32, No 1 (1988), Pagination: 72-72Abstract
No Abstract.Full Text
- Proceedings of the 31st Annual General Meeting
Authors
1 Dehra Dun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 35, No 6 (1990), Pagination: 665-665Abstract
No Abstract.Full Text
- Proceedings of the 33rd Annual General Body Meeting of the Geological Society of India
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 40, No 6 (1992), Pagination: 557-557Abstract
No Abstract.Full Text
- Gold Mineralization in the Sulphidic Bifs of Chitradurga Schist Belt, Karnataka - Possibility of New Workable Gold Deposits
Authors
1 Hutii Gold Mines, Bangalore, IN
2 National Geophysical Research Institute, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 1 (1995), Pagination: 91-93Abstract
No Abstract.Full Text
- The International Geological Congress, Beijing, 1996
Authors
1 Dept. of Earth Sciences, Indian Institute of Technology, Bombay-400076, IN
2 The Hutti Gold Mines Ltd, Bangalore-560042, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 1 (1997), Pagination: 109-112Abstract
No Abstract.Full Text
- Exploration, Mine Development and Pilot Plant Operation at Gadag Gold Field, Karnataka, India
Authors
1 Bangalore, IN
2 MSPL Ltd., Hospet, IN
3 Hutti Gold Mines Co. Ltd., Chitradurga, IN
4 National Geophysical Research Institute, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 3 (1999), Pagination: 322-326Abstract
No Abstract.Full Text
- Exploration for PGE and Base Metal Mineralization in the Archaean Ultramafic-Mafic Rocks of the Holenarasipur Greenstone Belt, Western Dharwar Craton (Southern India): A Preliminary Report
Authors
1 Rajamangala', Saptapur, Haliyal Road, Dharwad - 580 001, IN
2 Ramgad Minerals and Mining Pvt. Ltd., Baldota Enclave, Hospet - 583 203, IN
3 School of Geosciences, University of Witwatersrand, Johannesburg, ZA
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No Spl Iss 5 (2008), Pagination: 691-702Abstract
The ultramafic-mafic rocks of the Archaean Holenarasipur greenstone belts of the western Dharwar craton in southern India has been explored for PGE and base metal mineralization. This initiative was prompted by the overall favourable geological setting and the presence of anomalies of Pt (10-27 ppb) and Pd (8-21 ppb) in several of the stream sediment samples collected from different parts of the belt. The exploration programme consisted of field examination and analysis of over 276 samples collected from a range of mafic-ultramafic rocks in four main exploration blocks of the belt viz. Yedegondanahalli, Bantaratalalu, Yenneholeranganabetta and Bettadasatenahalli. The investigation has revealed weak mineralization with 10 to 111 ppb Pt, 16 to 166 ppb Pd and 40 to 277 ppb of (Pt+Pd). Anomalies were located in serpentinite, amphibolite and sill/dyke-like bodies of hornblendite. Two small patches of sulphide mineralisation located in the belt, in the Yedegondanahalli and Yenneholeranganabetta blocks, are Cu dominated (>1.0 wt% Cu) and analyze up to 0.3 wt% Ni, 0.09 wt% Co, 40 ppm Ag and 0.5 ppm Au.Keywords
Ultramafic-Mafic Rocks, PGE-Base Metal Exploration, Holenarasipur Belt, Dharwar Craton.
- The Ninth International Kimberlite Conference, Frankfurt, Germany
Authors
1 Geological Society of India, Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 6 (2008), Pagination: 837-840Abstract
No abstract.Full Text
- Rational Utilisation of Low Grade Iron Ore Fines and Slimes
Authors
1 Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 4 (1999), Pagination: 438-441Abstract
No Abstract.Full Text
- Corporate News
Authors
1 MSPL, Hospet, Karnataka, IN
2 NGRL, Hyderabad, IN
3 HGML, Bangalore, IN
4 Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 2 (1999), Pagination: 217-218Abstract
No Abstract.Full Text
- Role of Adakitic Magmatism and Subduction in Gold Endowment of Dharwar NEO-Archaean Greenstone Belts
Authors
1 Flat B-203, Block-B, United Avenue Apts, South End, 7 1-29, Ameerpet, Hyderabad-500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 4 (2008), Pagination: 576-577Abstract
No Abstract.Full Text
- Dharwad-2007: Proceedings of the Annual General Meeting-2006-2007
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 2 (2008), Pagination: 283-287Abstract
No Abstract.- Role of Adakitic Magmatism and Subduction in Gold Endowment of Dharwar Neoarchaean Greenstone Belts, India
Authors
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
2 Mineral Sales Private Limited, Hospet - 583 203, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 6 (2008), Pagination: 875-888Abstract
Acid volcanics found in auriferous greenstone belts of the Dharwar Craton are rhyolites, adakitic rhyohtes and high silica adakites Adakites are compositionally similar to TTG and characterized by high Na^/K^O, depleted MgO, Cr, Ni, Y and Yb. The adakitic melts were most probably generated by the partial melting of the basaltic slab below a mantle wedge LILE and LREE enriched IAB are the dominant volcanic members of the greenstone belts IAB of the greenstone belts were generated from partial melting of the mantle wedge under the influence of slab derived fluids. The wedge derived IAB and slab derived adakites were deformed and metamorphosed to generate fluids responsible for the gold endowment of these belts. Rhyohtes and possibly rhyohtic adakites were generated by the melting of the sialic continental crust forming top of the descending slab. Identification of adakites in auriferous greenstone belts strengthens the genetic link between adakite magmatism, subduction and Neoarchaean gold endowment.Keywords
Adakites, Dharwar Craton, Gold Greenstone Belt, Karnataka.- Training in Diamond Exploration
Authors
1 Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 4 (2008), Pagination: 453-458Abstract
No Abstract.Full Text
- Dehradun-2006: Proceedings of the Annual General meeting - 2005-2006
Authors
1 Geological Society of India, Bangalore - 560 019, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 1 (2007), Pagination: 183-191Abstract
No Abstract.- Proceedings of the Annual General Meeting - 2004-2005
Authors
1 Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 1 (2006), Pagination: 113-119Abstract
No Abstract.Full Text
- Chemical Composition of Tourmaline in Metarhyolite near Majjur, Gadag Schist Belt, Karnataka
Authors
1 National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, IN
2 292, 10th Main, Jayanagar, Bangalore - 560 041., IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 63, No 2 (2004), Pagination: 217-221Abstract
No Abstract.Full Text
- Gold Industry in India - Resources, Reserves, Mining, Metallurgy and Environment
Authors
1 Geological Society of India, Bangalore - 560 019, IN
2 Geomysore Services (India) Pvt. Ltd., Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 3 (2009), Pagination: 290-295Abstract
No Abstract.- Udaipur - 2008 Proceedings of the Annual General Meeting - 2007-08
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 3 (2009), Pagination: 431-436Abstract
No Abstract.- Mafic and Ultramafic Magmatism and Associated Mineralization in the Dharwar Craton, Southern India
Authors
1 'Rajamangala', Haliyal Road, Saptapur, Dharwad - 580 001, IN
2 School of Geosciences, University of Witwatersrand, Johannesburg, ZA
3 MSPL Limited, 'Baldota Enclave', Abheraj Baldota Road, Hospet - 583 203, IN
4 Department of Applied Geology, Kuvempu University, Jnanasahyadri, Shankaraghatta, Shimoga - 577 451, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No Spl Iss 1 (2009), Pagination: 73-100Abstract
Evidence of mafic and ultramafic magmatism exists in many parts of the Dharwar craton which is divided into two blocks, the West Dharwar Craton (WDC) and the East Dharwar Craton (EDC). The mafic-ultramafic rocks occur in supracrustal/greenstone belts and in numerous enclaves and slivers in the WDC. The oldest recorded maficultramafic rocks, which are mainly komatiitic in nature, are preserved in the Sargur Group which is more than 3.3-3.4 Ga old, the youngest being manifested by 63-76 Ma old mafic dyke magmatism, possibly related to Deccan volcanism.
In the Sargur Group, ultramafics rocks greatly dominate over mafic lithological units. Both extrusive and intrusive varieties, the latter in the form of differentiated layered complexes, occur. Mafic volcanics exists in all the greenstone belts of the eastern block and in the Bababudan and Western Ghats belts of the western block. In addition to the Sargur Group where stratigraphic sequences are unclear, mafic magmatism is recorded in three different formations of the Bababudan Group and two sub-divisions of the Shimoga and Chitradurga Groups where basaltic flows are conspicuous. In the well studied greenstone belts of Kolar and Hutti in the EDC, three to four different Formations of mafic volcanic rocks have been mapped. Isotopic dating has indicated that while mafic magmatism in the greenstone belts of the EDC covers only a short time span of between 2.65 to 2.75 Ga, those in the Dharwar Supergroup of the WDC cover a much longer time span from 3.35 to 2.5 Ga.
Mafic dyke magmatism has taken place repeatedly from 2.45 Ga to about 1.0 Ga, but, the peak of emplacement was between 1.8 and 1.4 Ga when the densely developed swarms on the western and south western portions of the Cuddapah Basin and in the central part of Karnataka, were intruded. Emplacement of potassic ultramafic magma in the form of kimberlite-lamproite which is confined to the EDC, is a later magmatic event that took place between 1.4 Ga and 0.8 Ga.
From a mineralization perspective, mafic magmatism of the supracrustal groups of the WDC and the greenstone belts of the EDC are the most important. V-Ti-magnetite bands constitute the most common deposit type recorded in the mafic-ultramafic complexes of the Sargur Group with commercially exploitable chromite deposits occurring in a number of belts. PGE mineralization of possible commercial value has so far been recorded in a single mafic-ultramafic complex, while copper-nickel mineralization occurs at certain localities in the Sargur and Chitradurga Groups. Gold mineralization hosted by mafic (occasionally ultramafic) rocks has been noted in many of the old workings located in supracrustal groups of rocks in the WDC and in the greenstone belts of EDC. Economically exploitable mineralization, however, occurs mainly in the greenstone belts of the Kolar, Ramagiri-Penkacherla and Hutti-Maski and along the eastern margin of the Chitradurga belt, where it is associated with a major N-S striking thrust zone separating the WDC from the EDC. Gold deposits of the eastern greenstone belts are comparable to those of the younger greenstone belts of Canada, Zimbabwe and Australia where the mineralization is associated with quartz carbonate veins often in iron-rich metabasic rocks. The gold was emplaced as hydrothermal fluids, derived from early komatiitic and tholeiitic magmas, and injected into suitable dilatent structures.
The other common type of mineralization associated with the ultramafic rocks of the Sargur Group and supracrustal belts, particularly of the WDC, are asbestos and soapstone, related to autometamorphism/metasomatism. Ruby/Sapphire deposits occur in places at the contacts of ultramafic rocks with the Peninsular Gneiss, and are related to contact metamorphism and metasomatism. Mineable magnesite deposits related to low-temperature hydrothermal/lateritic alteration exist in the zone of weathering, particularly in the more olivine-rich rocks. Recent spurt in diamond exploration is offering promise of discovering economically workable diamondiferous kimberlite/lamproite intrusions in the EDC.
Keywords
Mafic Magmatism, Mafic Dykes, Kimberlite-Lamproite, Mineralization, Dharwar Craton.- Aizawl - 2009: Proceedings of the Annual General Meeting
Authors
1 Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 2 (2010), Pagination: 355-363Abstract
No Abstract.- A Report on the International Symposium on Magmatic Ore Deposits (Covering Cr, PGE, Ni- Cu-Sulphide System) at IMMT, Bhubaneswar
Authors
1 NGRI, Hyderabad, IN
2 IIMT, Bhubaneswar, IN
3 GSI, Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 3 (2010), Pagination: 567-568Abstract
No Abstract.Full Text
- 6th International Dyke Conference, Varanasi, India
Authors
1 Geological Society of India, Bangalore - 560 019, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 4 (2010), Pagination: 573-575Abstract
No Abstract.- Charter of All India Ganga Yamuna Panchayat, 8-10 February 2010
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 4 (2010), Pagination: 668-670Abstract
No Abstract.Full Text
- Gold Mining: A Development Authority in Karnataka
Authors
1 Geological Society of India, No.63, 12th Basappa Layout, Gavipuram, Bangalore-560 019, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 3 (2010), Pagination: 208-214Abstract
No Abstract.- Bangalore - 2010: Proceedings of the Annual General Meeting
Authors
1 Geological Society of India, Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 6 (2010), Pagination: 543-547Abstract
No Abstract.- Vision Document on "Mineral Development - 2020 for Orissa"
Authors
1 Geological Society of India, Bangalore - 560 019, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 6 (2010), Pagination: 632-634Abstract
No Abstract.Full Text
- Report on Training in "Advances in Chromitite, Ni-Cu Sulphide and PGE Deposits in Ultramafic and Mafic Igneous Rocks with Special Reference to the Nuggihalli Schist Belt (NSB) and Extension Areas, Karnataka, India
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 2 (2011), Pagination: 200-201Abstract
No Abstract.Full Text
- Gold Metallogeny Indiaand Beyond
Authors
1 Geological Society of India, Bangalore - 560 019, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 5 (2011), Pagination: 478-480Abstract
No Abstract.Full Text
- Earth Day 2011 Celebrations
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 6 (2011), Pagination: 580-582Abstract
No Abstract.Full Text
- World Environment Day, 5th June, 2011
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 1 (2011), Pagination: 92-93Abstract
No Abstract.Full Text
- Proceedings of the Mining Exploration Convention
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 5 (2011), Pagination: 484-486Abstract
No Abstract.Full Text
- Varanasi - 2011: Proceedings of the Annual General Meeting 2010-11
Authors
1 Geological Society of India, Bangalore, IN