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Co-Authors
- T. Gnaneshwara Rao
- K. V. Anjaiah
- R. Srinivasan
- S. M. Naqvi
- B. Uday Raj
- D. V. Subba Rao
- T. Gnaneshwar Rao
- P. Rama Rao
- P. K. Govil
- V. Madhavan
- J. Mallikharjuna Rao
- Ramesh Kumar
- N. Subba Reddy
- C. V. R. K. Prasad
- M. Hanuma Prasad
- B. Krishna Rao
- V. N. Vasudev
- Tapan K. Baidya
- S. K. Mondal
- R. Parthasarathy
- R. Verma
- P. K. Mathur
- M. Ram Mohan
- D. Srinivasa Sarma
- S. N. Charan
- V. B. Rajasekhar
- Talat Ahmad
- C. Manikyamba
- M. satyanarayanan
- T. C. devaraju
- M. Satyanarayan
- T. Gnaneswar Rao
- N. P. Rajendra Prasad
- K. Naga Raju
- D. N. Sridhar
- Y. J. Bhaskar Rao
- Mihir Deb
- K. Surya Prakash Rao
- Parijat Roy
- G. V. Rao
- R. H. Sawkar
- Narayanaswamy
- N. Ramkumar
- S. P. Singh
- M. Satyanarayanan
- D. S. Sarma
- K. S. V. Subramanyam
- A. Kharia
- Puspendu Saha
- S. K. Acharyya
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
Balaram, V.
- International Proficiency Tests for Analytical Geochemistry Laboratories: An Assessment of Accuracy and Precision in Routine Geochemical Analysis
Abstract Views :179 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad 500 007, IN
1 National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 53, No 4 (1999), Pagination: 417-423Abstract
The results of Second International Proficiency Test (GeoPT2) obtained at the Geochemical Laboratory of National Geophysical Research Institute are presented. Estimation of 33 trace elements including all the fourteen rare earths obtained by ICP-MS in Bardon Volcanic Tuff Samples (OU-1) are compared with the assigned values. Sample decomposition method and other relevant details of the analytical procedures adopted are presented. Depending upon the 'Z-scores' calculated, the fitness of the data for either "pure geochemistry" or "applied geochemistry" was assessed. An overview of 'Z-score' results indicates that about 2/3rds of the data contributed from our laboratory fell within the -2<z<2 range which included majority of the trace and rare earth elements used normally in several pure geochemical investigations. These results allowed us to further investigate the analytical discrepancies observed in the data and optimize necessary aspects such as sample preparation by the use of more effective dissolution methods like microwave digestion and minimise the interference effects by the use of matrix matching calibrations.Keywords
Analytical Geochemistry, Pure Geochemistry, Applied Geochemistry, ICP-MS, Trace Elements, REE, Microwave Dissolution, 'Z-Score'.
- Geochemistry of the Archaean Greywackes from the Northwestern Part of the Chitradurga Schist Belt, Dharwar Craton, South India-Evidence for Granitoid Upper Crust in the Archaean
Abstract Views :146 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad 500007, IN
1 National Geophysical Research Institute, Hyderabad 500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 34, No 5 (1989), Pagination: 505-516Abstract
Turbidite greywackes of the northwestern part of the Chitradurga Schist Belt constitute a part of >2.6 Ga Cbitradurga Group of Dharwar Supergroup. They consist of a detrital assemblage of mono- and poly-crystalline quartz, microcline and plagioclase feldspar. and volcanic rock fragments. Quartz content and Na2O/K2O ratios show their quartz intermediate character. In this respect and also in their high FeO(t)+ MgO content they are similar to other Archaean greywackes. The TiO2 content. K2O/Na2O, Al2O3/CaO+Na2O and Al2O3/SiO2 ratios plotted against Fe2O3(t)+MgO, although assign an island arc environment for these greywackes, do not unequivocally discriminate between continental and oceanic island arc setting. The Chitradurga greywackes are highly enriched in Zr, Cr and Ni indicating a mixed felsic and mafic source. The contribution from contemporary volcanism in the basin could be significant. The QFL proportions indicate a dissected arc and/or recycled orogenic nature of the provenance. The chemical index of alteration varying from 58 to 63 and Al2O3/Na2O ratio less than 6, indicate relatively unweathered nature of source rock and chemical immaturity of the sediment respectively. The REE patterns show wen-defined negative europium anomalies which reflect granitoid upper crust in the provenance during the Archaean.- Geochemistry of Trondhjemites from Sigegudda, Hassan District, Karnataka
Abstract Views :186 |
PDF Views:1
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 37, No 4 (1991), Pagination: 351-358Abstract
The Sigegudda trondhjemites contain moderate Zr, high Ni and Cr and therefore appear to have formed by partial melting and/or fractional crystallization of Ni- and Cr-rich rocks like amphibolites. Lack of fractionation of Y, Zr and TiO2 and comparatively lower LREE/HREE ratio in these rocks perhaps indicate that garnet was not present in the magma source. The trondhjcmites were probably emplaced during the stabilization of the western Dharwar craton around 3.0 b.y. ago.Keywords
Trondhjemites, Geochemistry, Sigcgudda, Karnataka.- Geochemistry and Petrogenesis of Lamprophyres and Associated Dykes from Elchuru, Andhra Pradesh, India
Abstract Views :198 |
PDF Views:1
Authors
Affiliations
1 Department of Geology, Osmania University, Hyderabad-500 007, IN
2 National Geophysical Research Institute, Hyderabad-500 007, IN
3 Atomic Mineral Division, Civil Lines, Nagpur-440 001, IN
1 Department of Geology, Osmania University, Hyderabad-500 007, IN
2 National Geophysical Research Institute, Hyderabad-500 007, IN
3 Atomic Mineral Division, Civil Lines, Nagpur-440 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 40, No 2 (1992), Pagination: 135-149Abstract
Late stage intrusives, dominantly represented by lamprophyres, form a dyke swann in the Elchuru alkaline pluton of Andhra Pradesh; the other dykes of the swann which are non-lamprophyric include microshonkinite, nepheline syenite porphyry, basanite and olivine dolerite. The Elchuru lamprophyres and their plutonic equivalents, shonkinite and foidolite, consist of clinopyroxene, biotite. alkali feldspar and nepheline. Due to variation in the amount of nepheline, these lamprophyres, cover a wide range of rock types like minette, sannaite and tjosite. A plagioclase- bearing lamprophyre, camptonite, is also present though not abundantly.
The hallmark of the Elchuru lamprophyres is their transitional geochemical character-ranging between alkaline lamprophyres(AL) and calc-alkaline lamprophyres (CAL). From the present study it is surmised that these lamprophyres have crystallised from an LILE and LREE enriched, hydrous basic alkaline (mildly potassic) magma of a deep-seated (mantle?) origin. A petrogenetic scheme is presented covering the evolution of various rock units of the Elchuru alkaline pluton in general and the late stage intrusives (lamprophyres and other associated dykes) in particular.
Keywords
Lamprophyres, Dykeswarms, Elchuru, Andhra Pradesh.- REE in Precambrian BIF of Granulite Gneiss Belts of Tamil Nadu
Abstract Views :151 |
PDF Views:1
Authors
Affiliations
1 Department of Geology, S. V. University, Tirupati - 517 502, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
1 Department of Geology, S. V. University, Tirupati - 517 502, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 4 (1995), Pagination: 341-344Abstract
Rare Earth Element (REE) distribution in 10 samples of Precambrian BIF of granulite gneiss belts of Tami! Nadu suggest that the BIP derived their constitutents of iron and silica from hydrothermal source. The BIP thus formed were metamorphosed to granulite fades metamorphism along with the associated volcanogenic products and sediments.Keywords
Geochemistry, Iron Formation, Granulites, Tamil Nadu.- Geochemistry of Archaean Bimodal Volcanic Rocks of the Sandur Supracrustal Belt, Dharwar Craton, Southern India
Abstract Views :213 |
PDF Views:4
Authors
Affiliations
1 Department of Geology, University of Mysore, Manasagangotri, Mysore - 570 006, IN
2 Mineral Resources Consultant, 120/45(A), 3rdBlock, TR Nagar, Bangalore - 560 028, IN
3 National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, IN
1 Department of Geology, University of Mysore, Manasagangotri, Mysore - 570 006, IN
2 Mineral Resources Consultant, 120/45(A), 3rdBlock, TR Nagar, Bangalore - 560 028, IN
3 National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 3 (1997), Pagination: 307-322Abstract
In the late Archaean Sandur supracrustal belt of the Dharwar craton, Southem India, bimodal (mafic-felsic) volcanic rocks are encountered in its eastern region (Copper Mountain region). The mafic volcanic rocks are represented by Al-depleted picritic basalt and tholeliitic basalt. Pieritic basalt has a HREE - depleted pattern. Tholeliitic basalt exhibits two types of REE patterns; (a) slightly depleted - to flat - LREE and unfractionated HREE patterns, and (b) LREE - enriched and HREEdepleted patterns. The felsic volcanic rocks are Na-Rhyolites, which show calc-alkaline affinity and LREE - enriched and HREE-depleted chondrite-normalised patterns. Geochemical signatures show that the picritic basalt owes its origin to melting of a mantle diapir at depths around 100 km. The LREE - depleted tholeiites are not genetically related to the picritic basalt. They were derived through high degree partial melting of a depleted shallow mantle source. The internal variations observed in the LREE - depleted tholeiitic suite are due to derivation of magma through different degrees of melting of the same mantle source. REE-based petrogenetic modelling shows that the LREE - depleted and LREE - enriched tholeiites are not related to a common parent magma. The LREE - enriched tholeiites were generated from a mantle source, which has been metasomatized by subduction related melt/fluid phase. REE chemistry shows that the mafic and felsic volcanic rocks, though spatially and temporally associated, are not genetically related. The HREE depleted rhyolites were derived by partial melting of a garnet - amphibole bearing source, possibly a subducting oceanic crust. Feild, geochemical and petrogenetic aspects suggest that the magmatic rocks of the study area evolved in an active plate margin environment.Keywords
Geochemistry, Meauics, Late Archaean Sandur Belt, Kamataka.- PGE-Ag-Au Mineralization in a Cu-Fe-Ni Sulphide-Rich Breccia Zone of the Precambrian Nuasahi Ultramafic-Mafic Complex, Orissa, India
Abstract Views :208 |
PDF Views:2
Authors
Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta 700 032, IN
2 Refractory Division, Central Glass & Ceramic Research Institute, Calcutta 700 032, IN
3 Geochemistry Group, National Geophysical Research Institute, Hyderabad 500 007, IN
4 Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, IN
1 Department of Geological Sciences, Jadavpur University, Calcutta 700 032, IN
2 Refractory Division, Central Glass & Ceramic Research Institute, Calcutta 700 032, IN
3 Geochemistry Group, National Geophysical Research Institute, Hyderabad 500 007, IN
4 Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 5 (1999), Pagination: 473-482Abstract
The Precambrian ultramafic-mafic plutonic complex of Nuasahi, Orissa in the Eastern Indian Shield represents at least three suites of magmatic intrusion: (i) an interlayered sequence of enstatitite, websterite (± olivine), dunite, chromitite, harzburgite and orthopyroxenite; (ii) massive gabbroic suite with minor bodies of norite, anorthosite and bands of titaniferous magnetite and (iii) dykes and sills of dolerite and clinopyroxenite. A prominent breccia zone is developed near the interface of the first and second magmatic suites in the eastern part of the complex including the Shankar chromite lode and the ultramafic host of the first suite, and the gabbro-noritic rocks of the second suite. This breccia zone is enriched in Cu-Fe-Ni sulphides and has become the principal site for concentration of PGE, gold and silver. On a whole, Pd dominates over Pt in the sulphide-bearing Shankar chromite lode and the adjacent orthopyroxenite as well as gabbro in this breccia zone. The chromite-sulphide association is the most enriched part for PGE, gold and silver. Ag is positively correlated with Pd. The breccia zone which was developed prior to the gabbroic emplacement into the chromiferous ultramafics. represents a sulphide-rich metasomatic zone leading to maximum concentrations of PGE, Au, Ag in this zone alongwith formation of various sulphides, oxides and silicates. Both Pt and Pd are considerably higher and Ir is lower in the present area than in chromite-sulphide associations from ophiolitic complexes and Alpine-type massifs. Rather, Pt, Pd and Ir values compare better with the chromite-sulphide associations from layered intrusions.Keywords
Economic Geology, Ultramafic-Mafic Complex, Breccia Zone, Chromite-Sulphide Assemblage, PGE-Ag-Au, Nuasahi, Orissa.- Recent Advances in the Determination of PGE in Exploration Studies - A Review
Abstract Views :153 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, (Council of Scientific and Industrial Research), Hyderabad - 500 606, IN
1 National Geophysical Research Institute, (Council of Scientific and Industrial Research), Hyderabad - 500 606, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No Spl Iss 5 (2008), Pagination: 661-677Abstract
Concentrations and distribution of platinum-group elements (PGE: Ru, Rh, Pd, Os, Ir and Pt) in geological materials serve as important tracers of mantle processes, as well as extraterrestrial input into crustal environment. There is also considerable demand of these precious metals for their high economic value. Hence, an accurate abundance data of these and associated metals in geological materials are essential for an understanding of the processes that concentrate these elements in the crust, mantle and ore deposits. The last two decades have seen a dramatic increase in the quality of data available for PGE which is mainly due to advancements in high precision analytical techniques and related instrumentations. This has contributed immensely to an understanding of their geochemistry and processes that lead to mineralization and there also has been a considerable increase in the geochemical exploration activity for these elements in recent years. In this article, in addition to the above aspects, the recent developments in the estimation of PGE using different analytical techniques such as, flame atomic absorption spectrometry (F-AAS), graphite furnace atomic absorption spectrometry (GF-AAS), inductively coupled plasma atomic emission spectrometry (ICP-AES), accelerator mass spectrometry (AMS), instrumental neutron activation analysis (INAA), inductively coupled plasma mass spectrometry (ICP-MS) and high resolution inductively coupled plasma mass spectrometry (HR-ICP-MS) for the geochemical exploration studies, are being reviewed. Recent studies on the direct analysis of Pb and NiS buttons by LA-ICP-MS and LA-HR-ICP-MS have shown considerable promise for the PGE and gold exploration studies.Keywords
Analytical Techniques, Exploration, PGE, ICP-MS, Ultramafic-Mafic Rocks.- Geochemistry and Petrogenesis of Amphibolites from the Southern Part of Gadag Greenstone Belt, Karnataka
Abstract Views :172 |
PDF Views:2
Authors
M. Ram Mohan
1,
D. Srinivasa Sarma
1,
S. N. Charan
1,
V. Balaram
1,
V. B. Rajasekhar
1,
Talat Ahmad
2
Affiliations
1 National Geophysical Research Institute, Uppal Road, Hyderabad-500007, IN
2 Department of Geology, University of Delhi, Delhi-110007, IN
1 National Geophysical Research Institute, Uppal Road, Hyderabad-500007, IN
2 Department of Geology, University of Delhi, Delhi-110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 4 (2008), Pagination: 484-494Abstract
Gadag Greenstone Belt (GGB) is the northern continuation of Chitradurga Greenstone Belt (CGB). It consists of a variety of metavolcanic and metasedimentary rocks. Two types of metavolcanic assemblages are found in this terrane (l) the tholeute-calc-alkaline island arc bimodal assemblage and (u) the tholeute-high-Mg basalt assemblage The tholente-calc-alkaline assemblage is exposed in the central and northern parts, whereas the tholentic-high-Mg basaltic assemblage is found in the southwestern part of the belt. Tholente-high-Mg basalts are represented by the coarse-grained amphibolites formed under lower amphibolite facies conditions REE and HFSE data along with major element compositions confirm that these coarse-grained amphibolites are tholentic basalts derived from an intraoceanic island arc setting. The REE patterns are coherent, flat to slightly LREE depleted (La/Ybn =0.79 to 1.20, La/Smn =0.84-0.97, Gd/Ybn=1.07-1.50) with no Eu anomaly. Relationship between compatible and incompatible elements suggests least effects of alteration and no crustal contamination or fractional crystallization. The mixing calculations indicate that these rocks are derived by partial melting of a depleted mantle source, with source composition in between that of the N-MORB and high-Mg basalts.Keywords
Geochemistry, Petrogenesis, Amphibolites, Gadag Greenstone Belt.- National Seminar on Advancing Frontiers in Geochemistry through Utilization of Earth Resources
Abstract Views :152 |
PDF Views:121
Authors
Affiliations
1 National Geophysical Research Institute, Uppal Road, Hyderabad-500007, IN
1 National Geophysical Research Institute, Uppal Road, Hyderabad-500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 1 (2007), Pagination: 199-201Abstract
No Abstract.Full Text
- International Workshop on Recent Advances in Magmatic Ore Systems
Abstract Views :163 |
PDF Views:127
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad -500 007, IN
1 National Geophysical Research Institute, Hyderabad -500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 3 (2005), Pagination: 382-383Abstract
No Abstract.Full Text
- 10th International Platinum Symposium
Abstract Views :248 |
PDF Views:126
Authors
V. Balaram
1,
T. C. devaraju
2
Affiliations
1 National Geophysical Research Institute Hyderabad - 500 007, IN
2 Department of Applied Geology, Kuvempu University, Shankaraghatta - 577 451, IN
1 National Geophysical Research Institute Hyderabad - 500 007, IN
2 Department of Applied Geology, Kuvempu University, Shankaraghatta - 577 451, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 5 (2005), Pagination: 647-648Abstract
No Abstract.Full Text
- New ICP-MS National Facility at NGRI, Hyderabad
Abstract Views :171 |
PDF Views:118
Authors
Affiliations
1 National Geophysical Research Institute Hyderabad - 500 007
1 National Geophysical Research Institute Hyderabad - 500 007
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 4 (2003), Pagination: 495-495Abstract
No Abstract.Full Text
- National Training Course on Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Associated Analytical Techniques for Geochemical, Mineral Exploration and Environmental Studies and Diamond Jubilee Workshop-VI ON Trends in Geochemistry
Abstract Views :155 |
PDF Views:117
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 4 (2003), Pagination: 513-515Abstract
No Abstract.Full Text
- Applications of ICP-MS in Earth System Sciences
Abstract Views :144 |
PDF Views:202
Authors
Affiliations
1 National Geophysical Research Institute, Uppal Road, Hyderabad 500007, IN
1 National Geophysical Research Institute, Uppal Road, Hyderabad 500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 5 (2006), Pagination: 923-924Abstract
No Abstract.Full Text
- Paleoproterozoic Boninite-Like Rocks in an Intracratonic Setting from Northern Bastar Craton, Central India
Abstract Views :186 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad-500007, IN
1 National Geophysical Research Institute, Hyderabad-500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 3 (2008), Pagination: 373-380Abstract
Boninite-Like rocks represented by high-Ca boninitic dykes, melanogabbro dykes, recrystalized plagioclase bearing high MgO dykes and high-Mg nonte suites occur at few places in the vicinity of Meso to Neoproterozoic Chhattisgarh sedimentary basin in the northern Bastar craton in Central India. These rocks are formed in an intracratonic setting, not at convergent margin, similar to Archaean bonmitic rocks reported from intracratonic settings such as Mallina Basin, Northwest Australia and Abitibi, Optica regions of Canada. These high-MgO mafic dykes show a strong boninitic affinity with high SiO2 (>52%), high MgO (9-15%), low TiO2 (0 30-0 54 wt%) and strong LILE enrichment. These unusual dykes show distinct mineralogical, petrological and geochemical charactenstics and are totally different to that of the normally occurring abundant metadoleritic and metagabbroic dykes in Chhattisgarh region. The generation of bonmite magmatism requires unique thermal conditions such as shallow melting, elevated geothermal gradient and subducted slab flux. On the basis of field, geological, petrological and geochemical inferences on these Chhattisgarh boninitic and nontic dykes, a two-stage melting model and derivation from a strongly depleted mantle source, enriched later by metasomatic events is suggested.Keywords
Boninitic-Noritic Dykes, Chhattisgarh, Geochemistry, Bastar Craton.- Syed Mahmood Naqvi (1941-2009)
Abstract Views :231 |
PDF Views:124
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 4 (2009), Pagination: 531-532Abstract
No Abstract.Full Text
- A Report on the International Field Workshop on Gold Metallogeny in India
Abstract Views :188 |
PDF Views:126
Authors
Mihir Deb
1,
V. Balaram
2
Affiliations
1 Department of Geology, University of Delhi, Delhi -110 007, IN
2 National Geophysical Research Institute, Hyderabad - 500 606, IN
1 Department of Geology, University of Delhi, Delhi -110 007, IN
2 National Geophysical Research Institute, Hyderabad - 500 606, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 1 (2009), Pagination: 141-141Abstract
No Abstract.Full Text
- International Symposium on Carbon Management and Climate Change and Role of Applied Geochemistry in Mineral Exploration
Abstract Views :197 |
PDF Views:116
Authors
Affiliations
1 NGRI, Hyderabad, IN
2 ISAG, Hyderabad, IN
1 NGRI, Hyderabad, IN
2 ISAG, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 3 (2010), Pagination: 566-567Abstract
No Abstract.Full Text
- A Report on the International Symposium on Magmatic Ore Deposits (Covering Cr, PGE, Ni- Cu-Sulphide System) at IMMT, Bhubaneswar
Abstract Views :199 |
PDF Views:102
Authors
Affiliations
1 NGRI, Hyderabad, IN
2 IIMT, Bhubaneswar, IN
3 GSI, Bangalore, IN
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
- Concentration of Gold in Natural Waters from Lateritic Terrain, Wynad-Nilambur Gold Field, Kerala, India and its Possible Role in Exploration
Abstract Views :171 |
PDF Views:2
Authors
Affiliations
1 Centre for Earth Science Studies, Akkulam, Trivandrum - 695031, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
1 Centre for Earth Science Studies, Akkulam, Trivandrum - 695031, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 3 (1998), Pagination: 301-304Abstract
Water samples from wells adjoining abandoned mines in the Wynad-Nilambur Gold Field were analysed by ICP-MS for gold and values ranging from 0.05 ppb to 0.22 ppb obtained. Though gold in the water samples is in very low concentration, the study suggests that it is possible to use water samples in hydrogeochemical prospecting for gold by adopting ICP-MS instrumental technique after preconcentration of gold by activated charcoal. The procedure is very sensitive with detection limit approaching 0.1 parts per trillion.Keywords
Hydrogeochemistry, Gold, ICP-MS, Wynad-Nilambur Gold Fields, Kerala.- Platinum Group Minerals from the Madawara Ultramafic-Mafic Complex, Bundelkhand Massif, Central India: A Preliminary Note
Abstract Views :263 |
PDF Views:197
Authors
S. P. Singh
1,
V. Balaram
2,
M. Satyanarayanan
2,
D. S. Sarma
2,
K. S. V. Subramanyam
2,
K. V. Anjaiah
2,
A. Kharia
1
Affiliations
1 Department of Geology, Bundelkhand University, Jhansi - 284001, Uttar Pradesh, IN
2 National Geophysical Research Institute (CSIR), Uppal Road, Hyderabad - 500 007, IN
1 Department of Geology, Bundelkhand University, Jhansi - 284001, Uttar Pradesh, IN
2 National Geophysical Research Institute (CSIR), Uppal Road, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 3 (2011), Pagination: 281-283Abstract
No Abstract.Full Text
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- Geochemistry and Tectonic Setting of Tuting Metavolcanic Rocks of Possible Ophiolitic Affinity from Eastern Himalayan Syntaxis
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Authors
Affiliations
1 Department of Geology, ETL, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
2 Department of Geological Sciences, Jadavpur University, Kolkata - 700 032, IN
3 Geochemistry Division, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, IN
1 Department of Geology, ETL, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
2 Department of Geological Sciences, Jadavpur University, Kolkata - 700 032, IN
3 Geochemistry Division, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 167-176Abstract
Geochemistry of Tuting metavolcanic rocks is being reported for the first time. Narrow slivers of mafic volcanic rocks, as those at Tuting, also occur in close association with slivers of more complete sections of ophiolites at the Tsangpo river section upstream of Tuting and skirt round the Namche Barwa antiform. These detached slivers of the mafic volcanic rocks and the ophiolites represent the easternmost components of the Yarlung Tsangpo Ophiolite, and also define the arcuate shape of the Eastern Himalayan syntaxis. The metavolcanic rocks exposed at the apex of the Siang river dome at Tuting (Tsangpo River named Siang down stream of Tuting) is the only exposure of such rocks from the Himalayan syntaxial area in India.
The Tuting metavolcanic rocks correspond to andesite and basaltic andesite as per TAS diagram. The mobility of major elements possibly has affected their classification. As per Zr/TiO2 - Nb/Y diagram of Winchester and Floyd (1977), proposed for classification of altered igneous rocks, the Tuting samples mainly correspond to 'sub-akaline basalt' and one sample plot as 'andesite/basalt'. These have a flat chrondrite-normalised REE pattern. MORB-normalized multi-elemental plot shows enrichment in large ion lithophile (LIL) and the light rare earth elements (LREE), and depletion in several high field strength elements (HFSE). Based on these trace element patterns and a few discrimination plots, the Tuting metavolcanic rocks are inferred to have generated in supra-subduction zone environment in an intra-oceanic arc, back arc setting, or in a mid-ocean ridge process that resembles the Chile Ridge spreading centre.
Keywords
Tuting Metavolcanics, Ophiolite, Geochemistry, Siang Dome, Eastern Himalayan Syntaxis.References
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