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Subramanyam, K. S. V.
- Geochemistry of the Unusual Mafic Intrusions in Betul Fold Belt, Central India: Implications for Ni-Cu-Au-PGE Metallogeny
Abstract Views :248 |
PDF Views:119
Authors
D. V. Subba Rao
1,
M. Satyanarayanan
1,
D. Srinivasa Sarma
1,
K. S. V. Subramanyam
1,
K. Venkateswarlu
1,
M. Hanuma Prasad
2
Affiliations
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
2 Geomysore Services (India) Pvt Ltd, Bengaluru 560 037, IN
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
2 Geomysore Services (India) Pvt Ltd, Bengaluru 560 037, IN
Source
Current Science, Vol 108, No 4 (2015), Pagination: 713-722Abstract
We report here the recent occurrence of native gold and platinoids, associated with Fe-Ni-Cu-Pb-Zn sulphides and tungsten-bearing phases in the gabbroic intrusions emplaced in the Betul-Chhindwara Belt in the Central Indian Tectonic Zone (CITZ). The ore minerals are represented mainly by native gold, pentlandite, chalcopyrite, pyrite, bowieite and rare phases of tungsten, cadmium and palladium, which were identified by scanning electron microscopy. The whole rock geochemistry shows anomalous Ni-Cu and platinum group elements (PGE) in which palladium is always higher in concentration than in platinum. The inter-element relationships of PGE such as Pd versus Ir and Pt versus Ir indicate their fractionation by a sulphide phase and also suggest that the parental magmas are primitive in nature having high-Mg, low- Ti characteristics, which indicate the boninitic/picritic nature of magmas. A thorough investigation is essential for exploring the Betul mafic-ultramafic intrusions for proving their potential as the host rocks for Au and Ni-Cu-PGE ores.Keywords
Gabbro Intrusions, Geochemistry, Citz, Native Gold, Platinum Group Elements.Full Text
- 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
References
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- SATYANARAYANAN, M., BALARAM, V., SINGH, S.P., SARMA, D.S., ANJAIAH, K.V. and ADITYA KHARIA (2011) Platinum group elements in Madawara Igneous Complex, Bundelkhand massif, Central India: Some exciting results. DCS-DST Newsletter, v.21 (1), pp.19-24.
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- SINGH, S.P., BALARAM, V., SATYANARAYANAN, M., ANJAIAH, K.V. and ADITYA KHARIA (2010) Platinum group elements in basic and ultrabasic rocks around Madawara, Bundelkhand Massif, Central India. Curr. Sci., v.99(3), pp.375-383.
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- Origin of Intergrowth Textures in Koheda Pink Granite, East of Hyderabad City, India:Implications for Autometamorphic Conditions
Abstract Views :112 |
PDF Views:177
Authors
Affiliations
1 Department of Applied Geochemistry, Osmania University, Hyderabad-500007, IN
2 Geochemistry Division, CSIR-NGRI, Hyderabad-500007, IN
1 Department of Applied Geochemistry, Osmania University, Hyderabad-500007, IN
2 Geochemistry Division, CSIR-NGRI, Hyderabad-500007, IN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 5 (2016), Pagination: i-iiAbstract
The Intergrowth textures occurred in Koheda Pink granite (KPG) pluton is perthitic, myrmakitic and granophyric, and the main characteristic feature of the granite is Porphyritic where orthoclase phenocrysts are enclosed in matrix of quartz and plagioclase. The perthitic intergrowths are characteristics of autometamorphic origin and the myrmakitic and micrographic are simultaneous intergrowths due to solid state reaction.Keywords
Perthite, Crystallization, Granitoids, Intergrowth.Full Text
- Characterisation and Petrogenesis of Enclaves in Punugodu Granite Pluton, Prakasam District, Andhra Pradesh, India
Abstract Views :548 |
PDF Views:219
Authors
Affiliations
1 Department of Applied Geochemistry, Osmania University, Hyderabad-500007, IN
2 Geochemistry Division, CSIR-NGRI, Hyderabad-500007, IN
1 Department of Applied Geochemistry, Osmania University, Hyderabad-500007, IN
2 Geochemistry Division, CSIR-NGRI, Hyderabad-500007, IN
Source
International Journal of Earth Sciences and Engineering, Vol 10, No 4 (2017), Pagination: 924-930Abstract
Punugodu Granite Pluton (PGP) is one among the many granitic plutons hosted by Nellore Schist Belt (NSB) and considered as post collisional A-type Granite. It consists a variety of enclaves; they are seen as Xenoliths, Mafic magmatic enclaves (MME), Felsic magmatic enclaves (FME) and Basic Microgranular Enclaves (BME) which are having a distinct field, petrographic, and geochemical characteristics. They are subalkaline tholitic to alkaline and magnesian to ferroan in nature. Chondrite normalized REE patterns of MME, FME and xenoliths show fractionation, relative LREE enrichment and HREE depletion with negative-Eu anomalies. When compared among these enclaves, BME show slightly less fractionated REE patterns without Eu-anomalies, which is transitional between tholitic-alkaline basalts, and akin to oceanic-continental tectonic settings. BME of OIB signatures which are early formed and assimilated into granitic melts or late stage chemical exchange/equilibration of coeval melts at high temperatures. Enclaves could have derived from a single magma source more likely to be a high Ti-basaltic parentage with an involvement of magma chamber process in connection with mixing-mingling process at the coeval generation of magmas and assimilation process by the late stage granitic plutonism.Keywords
Granitoid, Enclaves, Nellore Schist Belt, Petrogenesis.Full Text
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