Abstract
The southwestern margin of the Eastern Ghats Belt characteristically exposes mafic dykes intruding massif-type charnockites. Dykes of olivine basalt of alkaline composition have characteristic trace element signatures comparable with Ocean Island Basalt (OIB). Most importantly strong positive Nb anomaly and low values of Zr/Nb ratio are consistent with OIB source of the mafic dykes. K-Ar isotopic data indicate two cooling ages at 740 and 530 Ma. The Pan-African thermal event could be related to reactivation of major shear zones and represented by leuco-granite vein along minor shear bands. And 740 Ma cooling age may indicate the low grade metamorphic imprints, noted in some of the dykes. Although no intrusion age could be determined from the present dataset, it could be constrained by some age data of the host charnockite gneiss and Alkaline rocks of the adjacent Prakasam Province. Assuming an intrusion age of ∼1.3Ga, Sr-Nd isotopic composition of the dykes indicate that they preserved time-integrated LREE enrichment. In view of the chemical signatures of OIB source, the mafic dykes could as well be related to continental rifting, around 1.3Ga, which may have been initiated by intra-plate volcanism.
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References
Bhattacharya S 1997 Evolution of Eastern Ghats granulite belt of India in a compressional tectonic regime and juxtaposition against iron ore craton of Singhbhum by oblique collision-transpression; Proc. Indian Acad. Sci. 106 65–75.
Bhattacharya S, Sen S K and Acharyya A 1994 Structural setting of the Chilka Lake granulite-migmatite-anorthosite suite with emphasis on the time relation of charnockites; Precamb. Res. 66 393–409.
Bhattacharya S and Sen S K 2003 Thermotectonic modelling of convergent orogens: Mantle involvement and implications for P-T-t paths; GEOS 14 7–12.
Bhattacharya S and Kar Rajib 2002 High-temperature dehydration melting and decompressive P-T path in a granulite complex from the Eastern Ghats, India; Contrib. Mineral. Petrol. 143 175–191.
Bhattacharya S 2004 High-temperature crustal scale shear zone at the western margin of the Eastern Ghats granulite belt, India: Implications for rapid exhumation; J. Asian Earth Sci. 24 281–290.
Bhattacharya S, Das P, Chaudhary A K and Saw A K 2010 Mafic granulite xenoliths in the Eastern Ghats granulite belt: Implications for lower crustal processes in the southeastern Indian Peninsula; Indian J. Geol. 80 53–67.
Bhattacharya S 2009 Mafic crustal xenoliths from the east Indian shield: Evidence for recycled continental crust in the Palaeoproterozoic and Archaean mantle; Abstract, Goldsmidt Conference, Davos.
Brannock W and Berthold S 1949 The determinations of sodium and potassium in silicate rocks by flame photometer; U.S. Geol. Surv. Bull. 992 1–14.
Burke K, Ashwal L D and Webb S J 2003 New way to map old sutures using deformed alkaline rocks and carbonatites; Geology 31 391–394.
Condie K C 1994 Plate Tectonics and Crustal Evolution; Butterworth-Heinemann Lincare House Publisher, pp. 282.
Crowe W A, Cosca M A and Harris L B 2001 40Ar/39Ar geochronology and Neoproterozoic tectonics along the northern margin of the Eastern Ghats belt in north Orissa, India; Precamb. Res. 108 237–266.
Dasgupta S, Sengupta P, Fukuoka M and Chakrabarti S 1992 Dehydration melting, fluid buffering and decompressional P-T path in a granulite complex from the Eastern Ghats, India; J. Metamor. Geol. 10 777–788.
Dasgupta S, Sanyal S, Sengupta P and Fukuoka M 1994 Petrology of granulites from Anakapalle-evidence for Proterozoic decompression in the Eastern Ghats, India; J. Petrol. 35 433–459.
Dasgupta S and Sengupta P 1998 Re-working of an isobarically cooled deep continental crust: Evidence of decompressive P-T trajectory from the Eastern Ghats belt, India; Indian J. Geol. 70 133–144.
Ernst R E, Buchan K L and Palmer H C 1995 Giant dyke swarms: Characteristics, distribution and geotectonic applications; In: Physics and chemistry of dykes (eds) Baer G and Heinmann, A.A. Balkema Rotterdam, 3–21.
Halden N M, Bowes D R and Dash B 1982 Structural evolution of migmatites in a granulite facies terrane: Precambrian crystalline complex of Angul, Orissa, India; R. Soc. Edinburgh 73 109–118.
Hofmann A W 2004 Sampling mantle heterogeneity through Oceanic basalts: Isotopes and trace elements; In: The Mantle and Core (ed.) Carlson R W, Treatise on Geochemistry 2 61–101.
Kovach V P, Simmat R, Rickers K, Berezhnaya N G, Salnikova E B, Dobmeier C, Raith M M, Yakovleva S Z and Kotov A B 2001 The western charnockite zone of the Eastern Ghats Belt, India: An independent crustal province of late Archaean (2.8 Ga) and Paleoproterozoic (1.7–1.6 Ga) terrains; Gondwana Res. 4 666–667.
Le Maitre R W 1989 A classification of igneous rocks and glossary of terms; Blackwell, Oxford.
McDonough W F and Sun S S 1995 The composition of the Earth; Chem. Geol. 120 223–253.
Murthy N G K 1987 Mafic dyke swarms of the Indian Shield; In: Mafic dyke swarms (eds) Halls H C and Fahrig W F, Geol. Assoc. Canada Spec. Paper 34 393–400.
Neogi S, Miura H and Hariya Y 1996 Geochemistry of the Dongargarh volcanic rocks, Central India: Implications for the Precambrian mantle; Precamb. Res. 76 77–91.
Ramakrishnan M, Nanda J K and Augustine P F 1998 Geological evolution of the Proterozoic Eastern Ghats Mobile Belt; Geol. Surv. India Spec. Publ. 44 1–21.
Sen S K, Bhattacharya S and Acharyya A 1995 A multistage pressure-temperature record in the Chilka Lake granulites: The epitome of metamorphic evolution of Eastern Ghats, India? J. Meteor. Geol. 13 287–298.
Sen S K and Bhattacharya S 1997 Dehydration melting of micas in the Chilka Lake khondalites: The link between the metapelites and granitoids; Proc. Indian Acad. Sci. (Earth Planet. Sci.) 106 277–297.
Sheraton J W and Black L P 1981 Geochemistry and geochronology of Proterozooic tholeiite dykes of East Antarctica: Evidence for mantle metasomatism; Contrib. Mineral. Petrol. 78 305–317.
Simmat R and Raith M M 2008 U-Th-Pb monazite geochronometry of the Eastern Ghats Belt, India: Timing and spatial disposition of poly-metamorphism; Precamb. Res. 162 16–39.
Srivastava R K, Hall R P, Verma R and Singh R K 1996 Contrasting Precambrian mafic dykes of the Bastar craton, Central India: Petrological and geochemical characteristics; J. Geol. Soc. India 48 537–546.
Srivastava R K, Singh R K and Verma R 2000 Juxtaposition of India and Antarctica during the Precambrian: Inferences from geochemistry of mafic dykes; Gondwana Res. 3 227–234.
Srivastava R K and Singh R K 2003 The Paleoproterozoic dolerite dyke swarm of the southern Bastar craton, Central-East India: A supporting evidence for the Columbia Supercontinent; In: Milestones in Petrology (ed.) Mohan A, Geol. Soc. India Memoir 52 163–177.
Srivastava R K and Singh R K 2004 Trace element geochemistry and genesis of Precambrian sub-alkaline mafic dykes from the central Indian craton: Evidence for mantle metasomatism; J. Asian Earth Sci. 23 373–389.
Tarney J 1992 Geochemistry and significance of mafic dykes swarms in the Proterozoic; Dev. Precamb. Geol. 10 151–179.
Vijaya Kumar K and Leelanandam C 2008 Evolution of the Eastern Ghats belt, India: A plate tectonic perspective; J. Geol. Soc. India 72 720–749.
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Bhattacharya, S., Chaudhary, A.K. & Teixeira, W. Mafic dykes at the southwestern margin of Eastern Ghats belt: Evidence of rifting and collision. J Earth Syst Sci 119, 815–823 (2010). https://doi.org/10.1007/s12040-010-0058-x
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DOI: https://doi.org/10.1007/s12040-010-0058-x