Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Open Access Open Access  Restricted Access Subscription Access
Open Access Open Access Open Access  Restricted Access Restricted Access Subscription Access

Geochemistry of Granitoids of Bilgi Area, Northern Part of Eastern Dharwar Craton, Southern India - Example of Transitional TTGs Derived from Depleted Source


Affiliations
1 Department of Atomic Energy, Begumpet, Hyderabad - 500 016, India
2 Department of Atomic Energy, Nagarabhavi, Bangalore - 560 072, India
     

   Subscribe/Renew Journal


Mildly deformed granitoids exposed around Bilgi in the northernmost part of the eastern Dharwar craton are divided into two groups viz. granodiorites and monzogranites. The granodiorites contain microgranular enclaves and amphibolite xenoliths, and show low-Al TTG affinity with high SiO2 (71-74 %), Na2O, Y and Sr/Y, moderate to moderately high Mg#, Cr and Ni, low to moderate LILE, and low Nb and Ta. However, compared to similar TTGs from different cratons the Bilgi granodiorites have distinctly higher K2O, K2O/Na2O, Rb and lower REE and Th. The amphibolite xenoliths are characterized by variable enrichment of K2O, Rb, Ba and Th and depletion of Ti, Zr and P compared to MORB. The microgranular enclaves are quartz diorite to granodiorite in composition with high Mg, Ni and Cr, and compared to MORB, are enriched in LILE and depleted in Ti and Y. The monzogranites, compared to the granodiorites, display higher SiO2, K2O and Rb with lower Mg#, although still maintaining the high Na2O, Ni and Cr and low REE character.

The Bilgi granodiorites are explained as transitional TTGs late synkinematic with respect to regional deformation. Geochemical signatures and regional geological set up suggest that they are probably derived from partial melting of a highly depleted slab material (metabasalt) followed by variable contamination or assimilation of intermediate crustal rocks in a subduction zone set up. Late stage fluid activity on the granodioritic magma is probably responsible for the generation of monzogranites. The amphibolite xenoliths predate the granodiorites and possibly represent fragments of a schist belt carried away by the granitic magma. They are probably island arc basalt derived from mantle source that has been metasomatized by slab-derived fluids. The microgranular enclaves are coeval with the Bilgi granodiorites and also likely to be island arc magmas derived from mantle variably enriched in slab-derived and within-plate components.


Keywords

Transitional TTG, Petrography, Geochemistry, Petrogenesis, Geodynamic Setting, Dharwar Craton.
Subscription Login to verify subscription
User
Notifications
Font Size

  • ARTH, J.G. and HANSON, G.N. (1975) Geochemistry and origin of the early Precambrian crust of northeastern Minnesota.Geochim. Cosmochim. Acta, v.39, pp.325-362.

  • BALAKRISHNAN, S., RAJAMANI, V. and HANSEN, G.N. (1999) U-Pb ages of zircon and titanite from the Ramagiri area, southern India: evidence for accretionary origin of the eastern Dharwar Craton during the late Archean. Jour. Geol., v.107, pp.69-86.

  • BARKER, F. (1979) Trondhjemites, dacites and related rocks, Elsevier, Amsterdam, 659p.

  • BARKER, F. and ARTH, J.G. (1976) Generation of trondhjemitetonalitic liquids and Archaean bimodal trondhjemite-basalt suites. Geology, v.4, pp.596-600.

  • BECKINSALE, R.D., DRURY, S.A. and HOLT, R.W. (1980) 3300 m.y.old gneisses from South Indian Craton. Nature, v.283, pp.469-470.

  • BEVINS, R.E., KOKELAAR, B.P. and DUNKLEY, P.N. (1984) Petrology and geochemistry of lower to middle Ordovician igneous rocks in Wales: a volcanic arc to marginal basin transition. Proc.Geol. Assoc., v.95, pp.337-347.

  • BOYNTON, W.V. (1984) Geochemistry of the rare earth elements; meteorite studies. In: P. Henderson (Ed.), Rare earth element geochemistry. Elsevier, Amsterdam, pp.63-114.

  • CHADWICK, B., VASUDEV, V.N. and HEGDE, G.V. (2000) The Dharwar craton, southern India, interpreted as the result of Late Archaean oblique convergence. Precambrian Res., v.99, pp.91-111.

  • CHADWICK, B., VASUDEV, V.N., HEGDE, G.V. and NUTMAN, A. (2007) Structure and SHRIMP U/Pb ages of granites adjacent to the Chitradurga schist belt: Implications for Neoarchaean convergence in the Dharwar craton, southern India. Jour. Geol.Soc. India, v.69, pp.5-24.

  • CHAMPION, D.C. and SMITHIES, R.H. (2001) Archaean granites of the Yilgran and Pilbara cratons, Western Australia. In: K.F. Cassidy, J.M. Dunphy and M.J. Van Kranendonk (Eds.), 4th Internatl. Archaean Symp. 2001, Extended Abs., AGSOGeoscience Australia, Record 2001/37, pp.134-136.

  • CHAMPION, D.C. and SMITHIES, R.H. (2003) Archaean Granites. In: P. Belvin, M. Jones and B. Chappel (Eds.), Magmas to Mineralization: The Ishihara Symposium. Geoscience Australia, pp.19-24.

  • CHARDON, D., CHOUKROUNE, P. and JAYANANDA, M. (1998) Sinking of the Dharwar basin (South India): implications for Archaean tectonics. Precambrian Res., v.9, pp.15-39.

  • CHARDON, D., PEUCAT, J-J., JAYANANDA, M., CHOUKROUNE, P. and FANNING, C.M. (2002) Archaean granite-greenstone tectonics at Kolar (South India): Interplay of diapirism and bulk inhomogeneous contraction during juvenile magmatic accretion. Tectonics, v.21, pp.7-1 to 7-17.

  • CONDIE, K.C. (1981) Archean Greenstone Belts. Elsevier, Amsterdam, 434p.

  • CONDIE, K.C. (2005) TTGs and adakites: are they both slab melts? Lithos, v.80, pp.33-44.

  • CONDIE, K.C., ALLEN, P. and NARAYANA, B.L. (1982) Geochemistry of the Archean Low- to high-grade transition Zone, Southern India. Contrib. Mineral. Petrol., v.81, pp.157-167.

  • CRUZ, E.L.C.C. DA, KUYUMJIAN, R.M. and BOAVENTURA, G.R. (2003) Low-K calc-alkaline granitic series of southeastern Tocantins State: chemical evidence for two sources for the granitegneissic complexes in the Paleoproterozoic Almas-Dianopolis terrane. Revista Brasileira de Geociencias, v.33, pp.125-136.

  • CULLERS, R.L. and GRAF, J.L. (1984) Rare Earth Elements in Igneous Rocks of the Continental Crust: Intermediate and Silicic Rocks - Ore Petrogenesis. In: P. Henderson (Ed.), Rare Earth Element Geochemistry, Elsevier, Amsterdam, pp.275-316.

  • DEY, S. (2006) Petrology and geochemistry of selected clastic rocks of the Kaladgi Supergroup and basement Closepet Granites from Bagalkot district, Karnataka, India. Unpublished Ph.D. thesis, Jadavpur University, Kolkata, 288p.

  • DIDIER, J. (1973) Granites and their enclaves. The Developments in Petrology, v.3, Elsevier, Amsterdam, 393p.

  • FENG, R. and KERRICH, R. (1992) Geochemical evolution of granitoids from the Archaean Abitibi Southern Volcanic Zone and the Pontiac subprovince, Superior Province, Canada: Implications for tectonic history and source regions. Chem. Geol., v.98, pp.23-70.

  • FROST, C.D., FROST, B.R., KIRKWOOD, R. and CHAMBERLIN, R. (2006) The tonalite-trondhjemite-granodiorite (TTG) to granodioritegranite (GG) transition in the late Archaean plutonic rocks of the central Wyoming Province. Can. Jour. Earth Sci., v.43, pp.1419-1444.

  • HARISH KUMAR, S.B., JAYANANDA, M., KANO, T., SHADAKSHARA SWAMY, N. and MAHABALESWAR, B. (2003) Late Archaean juvenile magmatic accretion process in the eastern Dharwar craton: Kuppam-Karimangalam area. Mem. Geol. Soc. India, no.50, pp.375-408.

  • JAYANANDA, M., CHARDON, D., PEUCAT, J.-J. and CAPDEVILA, R. (2006) 2.61 Ga potassic granites and crustal reworking in the western Dharwar craton, southern India: Tectonic, geochronologic and geochemical constraints. Precambrian Res., v.150, pp.1-26.

  • JAYANANDA, M., MOYEN, J.-F, MARTIN, H., PEUCAT, J.-J., AUVRAY, B. and MAHABALESWAR, B. (2000) Late Archean (25502520 Ma) juvenile magmatism in the Eastern Dharwar Craton, Southern India: constrains from geochronology, NdSr isotopes and whole rock geochemistry. Precambrian Res., v.99, pp.225-254.

  • KAMPUNZU, A.B., TOMBALE, A.R., ZHAI, M., BAGAI, Z., MAJAULE, T. and MODISI, M.P. (2003) Major and trace element geochemistry of plutonic rocks from Francistown, NE Botswana: evidence for a Neoarchaean continental active margin in the Zimbabwe craton. Lithos, v.71, pp.431-460.

  • KROGSTAD, E.J., HANSON, G.N. and RAJAMANI, V. (1991) U-Pb ages of zircon and sphene for two gneissic terranes adjacent to Kolar schist belt, South India: evidence for separate crustal evolution histories. Jour. Geol., v.99, pp.801-816.

  • KROGSTAD, E.J., HANSON, G.N. and RAJAMANI, V. (1995) Sources of continental magmatism adjacent to the late Archaean Kolar suture zone, south India: distinct isotopic and elemental signatures of two late Archaean magmatic series. Contrib. Mineral. Petrol., v.122, pp.159-173.

  • MARMO, V. (1971) Granite Petrology and the Granite Problem. Elsevier, Amsterdam, 244p.

  • MARTIN, H. (1987) Petrogenesis of Archaean trondhjemites, tonalites and granodiorites from eastern Finland: major and trace element geochemistry. Jour. Petrol., v.28, pp.921-953.

  • MARTIN, H. (1994) Archaean grey gneisses and the genesis of continental crust. In: K.C. Condie (Ed.), Archean Crustal Evolution, Elsevier, Amsterdam, pp.205-260.

  • MARTIN, H. and MOYEN, J.-F. (2002) Secular changes in tonalite, trondhjemi, tegranodiorite composition as markers of progressive cooling of the earth. Geology, v.30, pp.319-322.

  • MARTIN, H., SMITHIES, R.H., RAPP, R., MOYEN, J.-F. and CHAMPION, D. (2005) An overview of adakite, tonalite-trondhjemitegranodiorite (TTG), and sanukitoids: relationships and some implications for crustal evolution. Lithos, v.79, pp.1-24.

  • MATIN, A. (2006) Structural anatomy of the Kushtagi schist belt, Dharwar craton, south India–An example of Archaean transpression. Precambrian Res., v.147, pp.28-40.

  • MEEN, J.K., ROGGERS, J.J.W. and FULLAGER, P.D. (1992) Lead isotope composition of the Western Dharwar Craton, southern India: Evidence for distinct middle Archaean Terrane in a late Archaean Craton. Geochim. Cosmochim. Acta, v.56, pp.2455-2470.

  • MOYEN, J.-F., MARTIN, H., JAYANANDA, M. and AUVRAY, B. (2003) Late Archaean granites: a typology based on the Dharwar Craton (India). Precambrian Res., v.127, pp.103-123.

  • NAQVI, S.M., KHAN, R.M.K., MANIKYAMBA, C., RAM MOHAN, M. and KHANNA, T.C. (2006) Geochemistry of the Neoarchaean high-Mg basalts, boninites and adakites from the KushtagiHungund greenstone belt of the Eastern Dharwar Craton (EDC); implications for the tectonic setting. Jour. Asian Earth Sci., v.27, pp.25-44.

  • PATERSON, S.R., VERNON, R.N. and TOBISCH, O.T. (1989) A review of criteria for the identification of magmatic and tectonic foliation in granitoids. Jour. Struc. Geol., v.11, pp.349-363.

  • PEUCAT, J.J., MAHABALESWAR, B. and JAYANANDA, M. (1993) Age of younger tonalitic magmatism and granulitic metamorphism in the South Indian transition zone (Krishnagiri area); comparison with older Peninsular Gneisses from the GorurHassan area. Jour. Met. Petrol., v.11, pp.879-888.

  • PITCHER, W.S. (1997) The Nature and Origin of Granite. Chapman and Hall, London, 387p

  • RAPP, R.P., SHIMIZU, N. and NORMAN, M.D. (2003) Growth of early continental crust by partial melting of eclogite. Nature, v.425, pp.605-609.

  • RAPP, R.P., SHIMIZU, N., NORMAN, M.D. and APPLEGATE, G.S. (1999) Reaction between slab-derived melts and peridotite in the mantle wedge: experimental constraints at 3.8 GPa. Chem. Geol., v.160, pp.335-356.

  • ROLLINSON, H.R. (1993) Using geochemical data: Evaluation, presentation and interpretation. Longman, London, 352p.

  • ROLLINSON, H.R. and TARNEY, J. (2005) Adakites - the key to understanding LILE depletion in granulites. Lithos, v.79, pp.61-81.

  • SAMSONOV, A.V., BOGINA, M.M., BIBIKOVA, E.V., PETROVA, A.Y. and SHCHIPANSKY, A.A. (2005) The relationship between adakitic, calc-alkaline volcanic rocks and TTGs: implications for tectonic setting of the Karelian greenstone belts, Baltic Shield. Lithos, v.79, pp.83-106.

  • SPRINGER, W. and SECK, H.A. (1997) Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas. Contrib. Mineral. Petrol., v.127, pp.30-45.

  • TAYLOR, S.R. and MCLENNAN, S.M. (1997) The origin and evolution of Earth’s continental crust. Jour. Aus. Geol. Geophys., v.17, pp.52-62.

  • THOMPSON, R.N. (1984) Dispatches from basalt front. I.Experiments. Proc. Geol. Ass., v.95, pp.249-262.

  • VAN KRANENDONK, M., SMITHIES, H., CHAMPION, D. and HUSTON, D. (2008) Formation of Paleoarchean continental crust in a non-subduction setting: The East Pilbara example (abs.). International Geological Congress, Oslo, 2008.

  • WHALEN, J.B., MCNICOLL, V.J., GALLEY, A.G. and LONGSTAFFE, F.J. (2004) Tectonic and metallogenic importance of an Archaean composite high- and low-Al tonalitic suite, Western Superior Province, Canada. Precambrian Res., v.132, pp.275-301.

  • WHALEN, J.B., PERCIVAL, A., MCNICOLL, V.J. and LONGSTAFFE, F.J. (2002) A mainly crustal origin for tonalitic granitiod rocks, Superior Province, Canada: implications for Late Archean tectonomagmatic processes. Jour. Petrol., v.43, pp.1551-1570.

  • WILSON, M. (1989) Igneous Petrogenesis. Unwin Hyman, London, 466p.

  • WORKMAN, R.K. and HART, S.R. (2005) Major and trace element composition of the depleted MORB mantle (DMM). Earth Planet Sci. Lett., v.231, pp.53-72.

  • WOOD, D.A., JONON, J.L., TREUIL, M., NORRY, M. and TARNEY, J. (1979) Elemental and Sr isotope variations in basic lavas from Iceland and the surrounding ocean floor. Contrib. Mineral. Petrol., v.70, pp.319-339.


Abstract Views: 182

PDF Views: 0




  • Geochemistry of Granitoids of Bilgi Area, Northern Part of Eastern Dharwar Craton, Southern India - Example of Transitional TTGs Derived from Depleted Source

Abstract Views: 182  |  PDF Views: 0

Authors

Sukanta Dey
Department of Atomic Energy, Begumpet, Hyderabad - 500 016, India
A. K. Rai
Department of Atomic Energy, Nagarabhavi, Bangalore - 560 072, India
Anjan Chaki
Department of Atomic Energy, Begumpet, Hyderabad - 500 016, India

Abstract


Mildly deformed granitoids exposed around Bilgi in the northernmost part of the eastern Dharwar craton are divided into two groups viz. granodiorites and monzogranites. The granodiorites contain microgranular enclaves and amphibolite xenoliths, and show low-Al TTG affinity with high SiO2 (71-74 %), Na2O, Y and Sr/Y, moderate to moderately high Mg#, Cr and Ni, low to moderate LILE, and low Nb and Ta. However, compared to similar TTGs from different cratons the Bilgi granodiorites have distinctly higher K2O, K2O/Na2O, Rb and lower REE and Th. The amphibolite xenoliths are characterized by variable enrichment of K2O, Rb, Ba and Th and depletion of Ti, Zr and P compared to MORB. The microgranular enclaves are quartz diorite to granodiorite in composition with high Mg, Ni and Cr, and compared to MORB, are enriched in LILE and depleted in Ti and Y. The monzogranites, compared to the granodiorites, display higher SiO2, K2O and Rb with lower Mg#, although still maintaining the high Na2O, Ni and Cr and low REE character.

The Bilgi granodiorites are explained as transitional TTGs late synkinematic with respect to regional deformation. Geochemical signatures and regional geological set up suggest that they are probably derived from partial melting of a highly depleted slab material (metabasalt) followed by variable contamination or assimilation of intermediate crustal rocks in a subduction zone set up. Late stage fluid activity on the granodioritic magma is probably responsible for the generation of monzogranites. The amphibolite xenoliths predate the granodiorites and possibly represent fragments of a schist belt carried away by the granitic magma. They are probably island arc basalt derived from mantle source that has been metasomatized by slab-derived fluids. The microgranular enclaves are coeval with the Bilgi granodiorites and also likely to be island arc magmas derived from mantle variably enriched in slab-derived and within-plate components.


Keywords


Transitional TTG, Petrography, Geochemistry, Petrogenesis, Geodynamic Setting, Dharwar Craton.

References