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Jayananda, M.
- Fluid Evolution in the Closepet Granite: A Magmatic Source for CO2 in Charnockite Formation at Kabbaldurga ?
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Affiliations
1 Department of Geosciences, Osaka City University, Osaka 558, JP
2 Department of Geology, Bangalore University, Bangalore 560 056, IN
1 Department of Geosciences, Osaka City University, Osaka 558, JP
2 Department of Geology, Bangalore University, Bangalore 560 056, IN
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 38, No 1 (1991), Pagination: 55-65Abstract
Fluid inclusion studies in the Closepet granite reveal the common occurrence of trapped fluids which show melting temperatures and laser excited Raman spectral-characteristics close to those for pure CO2. The quartz-bound inclusions in this polyphase intrusive define two major genetic categories: an earlier CO2-rich fluid with only minor traces of water and a late mixed carbonic-aqueous fluid. Compelling evidence for fluid immiscibility is preserved by coexisting inclusions with widely varying filling ratios and similar filling temperatures. Salinities upto 10 wt per cent NaCl are estimated from microthermometry, which ascribe relatively higher temperatures for fluid immiscihility in the CO2-H2O system. Our results indicate that this late Archaean granite body which truncates regional metamorphic isograds has probably been a major carrier of CO2-rich volatiles, subsolidus exsolution and channelisation of which along structural locales caused incipient dehydration and the formation of Kabbaldurga-type arrested granulites in many adjacent localities. Our model seeks to associate advective transfer of both heat and volatiles required for dehydration with the Closepet magma.Keywords
Closepet Granite, Fluid Inclusions, Immiscibility, Charnockite, Dehydration.
- The Generation and Emplacement of Closepet Granite During Late Archaean Granulite Metamorphism in Southeastern Karnataka
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Authors
Affiliations
1 Department of Geology, Bangalore University, Bangalore 560 056, IN
1 Department of Geology, Bangalore University, Bangalore 560 056, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 38, No 4 (1991), Pagination: 418-426Abstract
In the amphibolite-granulite facies transition zone of southeastern Karnataka a typical metamorphic-anatectic sequence is exposed. In this zone large scale melting of basement gneisses during late Archaean granulite metamorphism has led to the generation of the Closepet granite. Field evidence suggests a space-time relationship between charnockite development, migmatite formation and generation of the Closepet granite. This is also substantiated by U-Pb and Pb-Pb isotope data. At the southern end of the Closepet granite, conventional petrological data and oxygen isotope work suggest that CO2-rich fluid phase of subcrustal origin was instrumental in granulite metamorphism and anatexis. The Southern Closepet granite is highly heterogeneous and displays a very complex polyphase internal structure. Based on texture and cross cutting relationships, four major granite phases are recognised. The P-T conditions inferred from mineralogic geothermometry and geobarometry indicate that granite melts were generated at midcrustal levels. The spatial association of migmatites and gradational contacts suggest that the granite in the transition zone did not rise far from its source region. The occurrence of ductile mylonites and augen gneisses further north of the study area indicates a major shear control in the generation of the Closepet granite. A model involving collision of eastern and western crustal blocks along a N-S dividing line is the possible tectonic set-up for evolution of the Closepet granite.Keywords
Closepet Granite, Anatexis, Migmatites, Charnockite, CO2 Fluid Phase, Karnataka.- Formation and Tectonic Evolution of Granulites from the Biligiri Rangan and Niligiri Hills, S. India: Geochemical and Isotopic Constraints
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Authors
Affiliations
1 Department of Geology, University of Mysore, Manasagangothri, Mysore-570006, IN
2 Department of Geology, Bangalore University, Bangalore 560 056, IN
1 Department of Geology, University of Mysore, Manasagangothri, Mysore-570006, IN
2 Department of Geology, Bangalore University, Bangalore 560 056, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 1 (1994), Pagination: 27-40Abstract
The granulites of the Biligiri Rangan (BR) and Niligiri Hill ranges are characterised by distinct field, geochemical and isotopic signatures. The B.R. Hill granulites contain a significant metasedimentary component (pelite-BIF-Mn-horizons), whilst metasediments are rare in the Niligiri granulite terrain. Lithologic and structural continuity between the two terrains cannot be demonstrated as they are separated by E-W running Moyar shear zone. Isotopic data suggest that B.R. Hills and Niligiri granulites have had different pre-crustal histories. Sm-Nd model TDM ages and U-Pb zircon concordia upper intercept age suggest that the protoliths of B.R.Hill quartzo-feldspathic charnockites accreted at 3.4Ga. On the other hand, Sm-Nd model TDM ages indicate that the magmatic protoliths of Niligiri granulites differentiated from mantle at 2.6 Ga.
Geochemical data from the B.R. Hills charnockites, particularly low-Mg numbers (0.2-0.3), low content of transition and HFS elements and strongly fractionated REE patterns with HREE depletion, suggest that their magmatic protoliths were derived by partial meltingof young, hydrated oceanic crust, in which garnet and amphibole were important residual phases. The high content of transition elements together with low total LREE and less-or unfractionated REE patterns of the B.R. Hills mafic granulites imply the derivation of their protoliths from long term depleted mantle sources. On the other hand the high Mg numbers (0.5-0.6), high content of transition and HFS elements, moderately fractionated REE patterns with HREE enrichment suggest that the protoliths of the Niligiri granulites are interpreted to have formed by melting of metasomatized mantle wedge with olivine and spinel as residual phases.
The Niligiri terrain was accreted onto the Dharwar Craton at C.2.6 Ga and the two terrains witnessed a common major granulite event at 2.51 Ga.
Keywords
Granulites, Isotopes, Geochemistry, Tectonics, B. R. Hills, Niligiri Hills, Karnataka, Tamil Nadu.- Structure and Rheology of the Lithosphere
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 288-289Abstract
No Abstract.Full Text
- Japan Holds 4th International Symposium on Gondwana to Asia and 2007 IAGR Annual Convention
Abstract Views :164 |
PDF Views:120
Authors
Affiliations
1 Bangalore, IN
2 NGRI, Hyderabad, IN
1 Bangalore, IN
2 NGRI, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 2 (2008), Pagination: 299-299Abstract
No Abstract.Full Text
- Ultra High Temperature Metamorphism
Abstract Views :189 |
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Authors
Affiliations
1 Bangalore University, IN
1 Bangalore University, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 6 (2008), Pagination: 893-894Abstract
No Abstract.Full Text
- Elementary Exercises in Geology
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PDF Views:129
Authors
Affiliations
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 2 (2006), Pagination: 273-274Abstract
No Abstract.Full Text
- Report on the 32nd International Geological Congress, Florence, Italy
Abstract Views :183 |
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Authors
Affiliations
1 Geology Department, University of Delhi Delhi - 110 007, IN
2 Department of Marine Geology, Mangalore University, Mangalagangotri - 574 199, IN
3 Department of Geology, Bangalore University, Bangalore - 560 056, IN
4 P.G. Department of Geology, Khallikote Autonomous College, Berhampur - 760 001, Orissa, IN
1 Geology Department, University of Delhi Delhi - 110 007, IN
2 Department of Marine Geology, Mangalore University, Mangalagangotri - 574 199, IN
3 Department of Geology, Bangalore University, Bangalore - 560 056, IN
4 P.G. Department of Geology, Khallikote Autonomous College, Berhampur - 760 001, Orissa, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 3 (2005), Pagination: 380-382Abstract
No Abstract.Full Text
- Petrology and Geochemistry of Late Archaean Granitoids in the Northern Part of Eastern Dharwar Craton, Southern India: Implications for Transitional Geodynamic Setting
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Authors
Affiliations
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Department of Earth Sciences, Yamaguchi University, Yamaguchi - 753, JP
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Department of Earth Sciences, Yamaguchi University, Yamaguchi - 753, JP
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 3 (2009), Pagination: 299-317Abstract
The results of field, petrographic and geochemical work of the granitoids of Hutti-Gurgunta area in the northern part of Eastern Dharwar Craton (EDC) is presented in this paper. This crustal section comprises polyphase banded to foliated TTG gneisses, middle amphibolite facies Gurgunta schist belt and upper greenschist facies Hutti schist belt and abundant granite plutons. The focus of the present study is mainly on basement TTG gneisses and a granite pluton (~240 sq km areal extent), to discuss crustal accretion processes including changing petrogenetic mechanism and geodynamic setting. The TTGs contain quartz, plagioclase, lesser K-feldspar and hornblende with minor biotite while the granite contain quartz, plagioclase, K-feldspar and hornblende. Late stage alteration (chloritisation, sericitisation and epidotisation) is wide spread in the entire area. A huge synplutonic mafic body which is dioritic to meladioritic in composition injects the granite and displays all stages of progressive mixing and hybridization. The studied TTGs and granite show distinct major and trace element patterns. The TTGs are characterized by higher SiO2, high Al2O3, and Na2O, low TiO2, Mg#, CaO, K2O and LILE, and HFS elements compared to granite. TTGs define strong trondhjemite trend whilst granite shows calc-alkaline trend. However, both TTGs and granite show characteristics of Phanerozoic high-silica adakites. The granite also shows characteristics of transitional TTGs in its high LILE, and progressive increase in K2O with differentiation. Both TTGs and granite define linear to sub-linear trends on variation diagrams. The TTGs show moderate total REE contents with fractionated REE patterns (La/YbN = 17.73-61.73) and slight positive or without any significant Eu anomaly implying little amount of amphibole or plagioclase in residual liquid. On the other hand, the granite displays poor to moderate fractionation of REE patterns (La/YbN = 9.06-67.21) without any significant Eu anomaly. The TTGs have been interpreted to be produced by low-K basaltic slab melting at shallow depth, whereas the granite pluton has been formed by slab melting at depth and these melts interacted with peridotite mantle wedge. Such changing petrogenetic mechanisms and geodynamic conditions explain increase in the contents of MgO, CaO, Ni and Cr from 2700 Ma to 2500 Ma granitoids in the EDC.Keywords
TTGs, Granites, Gurgunta-Hutti Area, EDC, Archaean Crustal Evolution, Karnataka.References
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- Synplutonic Mafic Injections into Crystallizing Granite Pluton from Gurgunta Area, Northern Part of Eastern Dharwar Craton: Implications for Magma Chamber Processes
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1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Department of Earth Sciences, Yamaguchi University, Yamaguchi, 753, JP
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Department of Earth Sciences, Yamaguchi University, Yamaguchi, 753, JP
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 2 (2009), Pagination: 171-188Abstract
In this paper we document widespread coeval felsic-mafic magma interaction and progressive hybridization near Gurgunta in the northern part of Eastern Dharwar Craton (EDC) where mafic magma pulses have injected into a 2.5 Ga granite pluton. The pluton contains voluminous pink porphyritic facies with minor equigranular grey facies. The mafic body shows compositional variation from diorite to meladiorite with hornblende as the chief mafic mineral with lesser clinopyroxene and biotite. The observed variation on binary diagrams suggests that granite was evolved by fractional crystallization. Chemical characteristics such as higher Al2O3 and moderate to high CaO, Mg#, Ni, Cr, Co and V are interpreted by slab-melting. Mafic bodies show lower SiO2, Na2O and K2O; but higher CaO, Mg#, FeO, Cr, Ni and V; higher LREE with moderate to higher HREE which suggest their derivation from mantle. A major active shear zone has played an important role at the time of synplutonic mafic injection and hybridization process.
Field evidences suggest that the synplutonic mafic body has injected into the crystallizing felsic magma chamber in successive stages. The first stage injection has resulted in extensive mixing and hybridization due to the liquidus state of resident felsic magma to which hot mafic magma was injected. However, progressive mixing produced heterogeneity as the xenocrysts started mechanically dispersed into hybrid magma. The second stage injection, after a time gap, encountered colder and viscous hybrid magma in the magma chamber, which inhibited free injection. As a consequence, the mafic magma spread into magma chamber as flows, producing massive mafic bodies. However, with the continued mafic pulses and the heat gradient, the viscosity contrasts of mafic magma and felsic magma were again lowered resulting in second stage mixing. This episode was followed by mingling when the granite was almost crystallized, but still viscous enough to accommodate lamellar and ribbon like mafic penetrations to produce mingling. The successive mixing and mingling processes account for the observed heterogeneity in the granite pluton.
Keywords
Granite Plutons, Synplutonic Mafic Dykes, Felsic-Mafic Magma Interaction, Hybridization, Dharwar Craton, Gurgunta, Karnataka.References
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- Synplutonic Mafic Dykes from Late Archaean Granitoids in the Eastern Dharwar Craton, Southern India
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Authors
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1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Institute for Earth Evolution, JAMSTEC, Yokosuka, JP
3 Department of Earth Sciences, Yamaguchi University, Yamaguchi, JP
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Institute for Earth Evolution, JAMSTEC, Yokosuka, JP
3 Department of Earth Sciences, Yamaguchi University, Yamaguchi, JP