Skip to Main Content
Skip Nav Destination
GEOREF RECORD

U-Pb and Hf isotope study of detrital zircon and Cr-spinel in the Banavara Quartzite and implications for the evolution of the Dharwar Craton, south India

Bidyananda Maibam, Davide Lenaz, Stephen Foley, Jasper Berndt, Elena Belousova, Monica Wangjam, Jitendra N. Goswami and Argyrios Kapsiotis
U-Pb and Hf isotope study of detrital zircon and Cr-spinel in the Banavara Quartzite and implications for the evolution of the Dharwar Craton, south India
Geological Magazine (September 2021) 158 (9): 1671-1682

Abstract

The Sargur Group has been considered to be the oldest group (>3.0 Ga) in the Archaean sequence of the Dharwar Craton in south India, whereas the rocks of the Dharwar Supergroup are younger (between 3.0 and 2.55 Ga). The supracrustal units of the Sargur Group were deposited during the Archaean period. The Banavara quartzite forms part of the supracrustal Sargur Group and contains significant amounts of chromian spinel (Cr-spinel). Here, U-Pb and Hf isotopes of detrital zircons are integrated with compositional data and X-ray refinement parameters for Cr-spinels to decipher the provenance of the metasediments. Zircons show an age spectrum from 3.15 to 2.50 Ga, and juvenile Hf isotopic compositions (epsilon Hf=+0.8 to +6.4) with model ages between 3.3 and 3.0 Ga. Major- and trace-element contents of the Cr-spinels do not resemble those in the Sargur ultramafic rocks, but resemble well-characterized Archaean anorthosite-hosted chromites. Cr-spinel trace-element signatures indicate that they have undergone secondary alteration or metamorphism. X-ray refinement parameters for the Cr-spinels also resemble the anorthosite-hosted chromites. We conclude that the detrital minerals were probably derived from gneissic and anorthositic rocks of the Western Dharwar Craton, and that the Sargur Group sequences have experienced a younger (2.5 Ga) metamorphic overprint.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 158
Serial Issue: 9
Title: U-Pb and Hf isotope study of detrital zircon and Cr-spinel in the Banavara Quartzite and implications for the evolution of the Dharwar Craton, south India
Affiliation: Manipur University, Department of Earth Sciences, Canchipur, India
Pages: 1671-1682
Published: 202109
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 100
Accession Number: 2021-060437
Categories: GeochronologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N13°25'00" - N13°26'60", E76°07'00" - E76°09'00"
Secondary Affiliation: University of Trieste, ITA, ItalyMacquarie University, AUS, AustraliaUniversitaet Muenster, DEU, GermanyPhysical Research Laboratory, IND, IndiaSun Yat-sen University, CHN, China
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2021
Close Modal

or Create an Account

Close Modal
Close Modal