ABSTRACT The giant plagioclase basalts (GPBs) with plagioclase phenocrysts that reach up to 3 cm in length are found near Jabalpur in the northeastern part of the Deccan Volcanic Province (DVP). The thickness of the basalt flow (flow 6) that contains the GPBs is ~ 20 m. Plagioclase phenocysts (An58 - An64) in the GPBs display many features of magma mixing (e.g., resorption, reverse zoning). Of the nine flows in the Jabalpur section, the GPBs (flow 6) with lowest Mg#s (38 - 43) and MgO (4.16 - 5.08 wt%), Ni and Cr abundances are the most evolved compositions. In addition, these GPBs have highest abundances of incompatible elements (TiO2, P2O5, Nb, Zr, Sr and Ba). The GPBs are compositionally similar to the well-studied Mahabaleshwar lavas of the western DVP. This new occurrence of GPBs has implications for existence of local crustal magma chambers, feeders and vents in the northeastern part of the DVP.
Cite this paper
R. Talusani, "Giant Plagioclase Basalts from Northeastern Deccan Volcanic Province, India: Implications for Their Origin and Petrogenetic Significance," International Journal of Geosciences, Vol. 3 No. 5, 2012, pp. 1027-1032. doi: 10.4236/ijg.2012.35103.
 Z. X. Peng, J. J. Mahoney, P. R. Hooper, C. Harris and J. E. Beane, “A Role for Lower Continental Crust in the Flood Basalt Genesis? Isotopic and Incompatible Element Study of the Lower Six Formations of the Western Deccan Traps,” Geochimica et Cosmochimica Acta, Vol. 58, No. 1, 1994, pp. 267-288.
 O. Eldholm and M. F. Coffin, “Large Igneous Provinces and Plate Tectonics,” In: M. A. Richards, R. G. Gordon and R. D. Van Der Hilst, The History and Dynamics of Global Plate Motions. Geophysical Monographs, Amer Geophysical Union, Washington, 2000, pp. 309-326.
 R. A. Duncan and D. G. Pyle, “Rapid Eruption of the Deccan Flood Basalts at the Cretaceous/Tertiary Boundary,” Nature, Vol. 333, No. 6176, 1988, pp. 841-843.
 C. Hofmann, G. Feraud and V. Courtillot, “39Ar/40Ar Dating of Mineral Separates and Whole Rocks from the Western Ghats Lava Pile: Further Constraints on Duration and Age of the Deccan Traps,” Earth and Planetary Science Letters, Vol. 180, No. 1-2, 2000, pp. 13-27.
 J. J. Mahoney, J. D. Macdougall, G. W. Lugmair, A. V. Murali, M. Das and K. Gopalan, “Origin of the Deccan Trap Flows at Mahabaleshwar Inferred from Nd and Sr Isotopic and Chemical Evidence,” Earth and Planetary Science Letters, Vol. 60, No. 1, 1982, pp. 47-60.
 K. G. Cox and C. J. Hawkesworth, “Geochemical Stratigraphy of the Deccan Traps at Mahabaleshwar, Western Ghats, India, with Implications for Open System Magmatic Processes,” Journal of Petrology, Vol. 26, No. 2, 1985, pp. 355-377.
 J. E. Beane, C. A. Turner, P. R. Hooper, K. V. Subbarao and J. N. Walsh, “Stratigraphy, Composition and Form of the Deccan Basalts, Western Ghats, India,” Bulletin of Volcanology, Vol. 48, No. 1, 1986, pp. 61-83.
 G. Sen, “Mineralogy and Petrogenesis of the Deccan Trap lava Flows around Mahabaleshwar, India,” Journal of Petrology, Vol. 27, No. 3, 1986, pp. 627-663.
 P. R. Hooper, K. V. Subba Rao and J. E. Beane, “The Giant Plagioclase Basalts (GPBs) of the Western Ghats, Deccan Traps,” Memoir of the Geological Society of India, Vol. 10, 1988, pp. 135-144.
 L. Melluso, L. Beccaluva, P. Brotzu, A. Gregnanin, A. K. Gupta, L. Morbidelli and G. Traversa, “Constraints on the Mantle Sources of the Deccan Traps from the Petrology and Geochemistry of the Basalts of Gujarat State (Western India),” Journal of Petrology, Vol. 36, No. 5, 1995, pp. 1393-1432.
 Z. X. Peng, J. J. Mahoney, P. R. Hooper, J. D. Macdougall and P. Krishnamurthy, “Basalts of the Northeastern Deccan Traps, India: Isotopic and Elemental Geochemistry and Relation to Southwestern Deccan stratigrapy,” Journal of Geophysical Research, Vol. 103, No. B12, 1998, pp. 29843-29865. doi:10.1029/98JB01514
 J. J. Mahoney, H. C. Sheth, D. Chandrasekharam and Z. X. Peng, “Geochemistry of Flood Basalts of the Toranmal Section, Northern Deccan Traps, India: Implications for Regional Deccan Stratigraphy,” Journal of Petrology, Vol. 41, No. 7, 2000, pp. 1099-1120.
 M. D. Higgins and D. Chandrasekharam, “Nature of Sub-Volcanic Magma Chambers, Deccan Province, India: Evidence from Quantitative Textural Analysis of Plagioclase Megacrysts in the Giant Plagioclase Basalts,” Journal of Petrology, Vol. 48, No. 5, 2007, pp. 885-900.
 R. V. R. Talusani, “Bimodal Tholeiitic and Mildly Alkalic Basalts from Bhir Area, Central Deccan Volcanic Province, India: Geochemistry and petrogenesis,” Journal of Volcanology and Geothermal Research, Vol. 189, No. 3, 2010, pp. 278-290.
 D. Chandrasekharam, J. J. Mahoney, H. C. Sheth and R. A. Duncan, “Elemental and Nd-Sr-Pb Isotope Geochemistry of Flows and Dikes from the Tapti Rift, Deccan Flood Basalt Province, India,” Journal of Volcanology and Geothermal Research, Vol. 93, No. 1-2, 1999, pp. 111-123. doi:10.1016/S0377-0273(99)00081-5
 A. P. le Roex, F. A. Frey and S. H. Richardson, “Petrogenesis of Lavas from the AMAR Valley and Narrowgate Region of the FAMOUS Valley, 36?-37?N on the Mid-Atlantic Ridge,” Contributions to Mineralogy and Petrology, Vol. 124, No. 2, 1996, pp. 167-184.
 H. Hansen and K. Gr?nvold, “Plagioclase Ultraphyric Basalts in Iceland: The Mush of the Rift,” Journal of Volcanology and Geothermal Research, Vol. 98, 2000, pp. 1-32. doi:10.1016/S0377-0273(99)00189-4
 J. J. Mahoney, “Deccan Traps,” In: J. D. Macdougall, Ed., Continental Flood Basalts, Kluwer Academic Publishers, Norwell, 1988, pp. 151-194.
 M. Carr, “Igpet 2007 for Windows XP or Vista,” Terra Softa Inc, 2007.
 M. Wilson, “Igneous Petrogenesis,” Unwin Hyman, London, 1989. doi:10.1007/978-1-4020-6788-4
 W. F. McDonough, S. Sun, A. E. Ringwood, E. Jagoutz and A. W. Hofman, “K, Rb and Cs in the Earth and Moon and the Evolution of the Earth’s Mantle,” Geochimica et Cosmochimica Acta, Vol. 56, 1992, 1001-1012.
 W. V. Boynton, “Geochemistry of the Rare Earth Elements: Meteorite Studies,” In: P. Henderson, Ed., Rare earth element geochemistry, Elsevier, Amsterdam, 1984, pp. 63-114.
 L. E. Borg, M. A. Clynne and T. A. Bullen, “The Variable Role of Slab-Derived Fluids in the Generation of a Suite of Primitive Calc-Alkaline Lavas from the Southernmost Cascades, California,” Canadian Mineralogist, Vol. 35, 1997, pp. 425-452.
 D. M. Shaw, “Trace Element Fractionation during Anatexis,” Geochimica et Cosmochimica Acta, Vol. 34, No. 2, 1970, pp. 237-243. doi:10.1016/0016-7037(70)90009-8
 C. W. Devey and P. C. Lightfoot, “Volcanological and Tectonic Control of Stratigraphy and Structure in the Western Deccan Traps,” Bulletin of Volcanology, Vol. 48, No. 4, 1986, pp. 195-207. doi:10.1007/BF01087674
 P. C. Lightfoot, C. J. Hawkesworth, C. W. Devey, N. W. Rogers and P. W. C. Van Calsteren, “Source and Differentiation of Deccan Trap Lavas: Implications of Geochemical and Mineral Chemical Variations,” Journal of Petrology, Vol. 31, No. 5, 1990, pp. 1165-1200.