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Geochronology and geochemistry of Meso- to Neoarchean magmatic epidote-bearing potassic granites, western Dharwar Craton (Bellur-Nagamangala-Pandavpura Corridor), southern India; implications for the successive stages of crustal reworking and cratonization

M. Jayananda, M. Guitreau, Tarun Thomas, H. Martin, K. R. Aadhiseshan, R. V. Gireesh, J. J. Peucat and M. Satyanarayanan
Geochronology and geochemistry of Meso- to Neoarchean magmatic epidote-bearing potassic granites, western Dharwar Craton (Bellur-Nagamangala-Pandavpura Corridor), southern India; implications for the successive stages of crustal reworking and cratonization (in Archean granitoids of India; windows into early Earth tectonics, S. Dey (editor) and J. F. Moyen (editor))
Special Publication - Geological Society of London (February 2019) 489 (1): 79-114

Abstract

We present field, petrographic characteristics, zircon U-Pb ages, Nd isotopes, major and trace element data for the magmatic-epidote bearing granitic plutons in Bellur-Nagamangala-Pandavpura corridor and address successive reworking and cratonization events in the western Dharwar craton (WDC). U-Pb zircon ages reveal three stages of plutonism including: (i) sparse 3.2 Ga granodiorite plutons within the TTG basement (ii) 3.0 Ga monzogranite to quartz monzonite plutons adjoining the Nagamangala greenstone belt and (iii) 2.6 Ga monzogranite plutons in the Pandavpura region. Elemental data of the 3.2 Ga granodiorite indicate their origin through melting of mafic protoliths without any significant residual garnet. REE patterns of 3.0 Ga plutons with negative Eu anomalies and Nd isotope data with epsilon (sub Nd) (T) = 3.0 Ga ranging +0.5 to -1.7 indicate major crustal source with minor mantle input. Poorly fractionated REE patterns with negative Eu anomalies of 2.6 Ga plutons suggest plagioclase in residue. The presence of magmatic epidote in all the plutons points to their rapid emplacement and crystallization ca. 5 kbars. The three groups of plutons correspond to successive stages of reworking linked to melting of deep crust and cratonization of WDC during 3.2 Ga, 3.0 Ga and 2.6 Ga.


ISSN: 0305-8719
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 489
Serial Issue: 1
Title: Geochronology and geochemistry of Meso- to Neoarchean magmatic epidote-bearing potassic granites, western Dharwar Craton (Bellur-Nagamangala-Pandavpura Corridor), southern India; implications for the successive stages of crustal reworking and cratonization
Title: Archean granitoids of India; windows into early Earth tectonics
Affiliation: University of Hyderabad, Centre for Earth, Ocean & Atmospheric Sciences, Hyderabad, India
Pages: 79-114
Published: 20190219
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 87
Accession Number: 2019-044572
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, geol. sketch maps
N12°00'00" - N16°00'00", E74°00'00" - E78°00'00"
Secondary Affiliation: Universite Clermont Auvergne, FRA, FranceUniversity of Delhi, IND, IndiaUniversite Rennes I, FRA, FranceNational Geophysical Research Institute, IND, India
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201923
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