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Tracing the crustal evolution of the Precambrian Southern Granulite Terrane in east Gondwana; new insights from zircon U-Pb/Hf geochronology

J. K. Tomson and J. Amal Dev
Tracing the crustal evolution of the Precambrian Southern Granulite Terrane in east Gondwana; new insights from zircon U-Pb/Hf geochronology
Geological Society of America Bulletin (September 2023) Pre-Issue Publication

Abstract

The Precambrian Southern Granulite terrane of south India has a crustal evolution history broadly bracketed between the late Archean and Cambrian with records of polyphase deformation, metamorphism, and magmatism. The Southern Granulite terrane comprises distinct crustal blocks bounded by shear/suture zones that have been variably correlated with supercontinent fragments including Madagascar, Sri Lanka, Africa, Eastern Ghats, and Antarctica. However, the timing and mechanism of assembly of different crustal blocks within the Southern Granulite terrane and its linkages with counterparts in East Gondwana are highly debated. This study aimed to unravel the complex crustal evolutionary pattern of the terrane by generating robust zircon U-Pb/Hf isotopic data from basement charnockites, gneisses, granitoids, and alkaline intrusive units from the central part of Southern Granulite terrane and comparing these results with similar data from different East Gondwanan terranes. The study identified four distinct crustal growth episodes in the Madurai block: (1) Neoarchean-Early Paleoproterozoic, (2) Rhyacian-Orosirian, (3) Late Tonian, and (4) Ediacaran-Cambrian. Analysis of zircon Hf isotope data revealed that the first two events are marked by juvenile magmatic signatures, whereas the latter two are distinctly associated with intense reworking and remelting of older crust with no significant juvenile input. Our new results combined with existing data from other Gondwanan terranes suggest a common Paleoproterozoic ancestry for the Southern Granulite terrane and its corresponding Gondwanan fragments, proposing a revision to the existing geodynamic models.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: Pre-Issue Publication
Title: Tracing the crustal evolution of the Precambrian Southern Granulite Terrane in east Gondwana; new insights from zircon U-Pb/Hf geochronology
Affiliation: National Centre for Earth Science Studies, Solid Earth Research Group, Isotope Geochemistry Facility, Kerala, India
Published: 20230920
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 160
Accession Number: 2023-077285
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N09°30'00" - N10°00'00", E77°00'00" - E77°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2023, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 2023
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