Contrasting crustal evolution processes in the Dharwar craton: insights from detrital zircon U–Pb and Hf isotopes

Penny Lancaster, Sukanta Dey, Craig Storey, Anirban Mitra, Rakesh Bhunia

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    Abstract

    New in situ U–Pb-Hf analyses of detrital zircons from across the Archaean Dharwar craton indicate significant juvenile crustal extraction events at ~3.3 and 2.7 Ga, and continuous extraction from 3.7–3.3 Ga. Reworking in the older western block at ~3.0 Ga marks the onset of cratonisation, most likely due to ‘modern’ plate tectonic processes, while reworking in both the western and younger eastern block at 2.55–2.50 Ga indicates accretion of the two terranes and final cratonisation much later than in most other Archaean terranes (~2.7 Ga). Different patterns of disturbance to the zircon U–Pb systematics reflect variations in both the U content of parent rocks and later metamorphic conditions. Tectonic links are observed between the Kaapvaal and western Dharwar cratons, and between the north China and eastern Dharwar cratons, though none of these links necessarily requires a consanguineous origin.
    Original languageEnglish
    Pages (from-to)1361-1372
    JournalGondwana Research
    Volume28
    Issue number4
    DOIs
    Publication statusPublished - 31 Oct 2014

    Keywords

    • Dharwar craton
    • zircon
    • U-Pb
    • Hf model age
    • crustal evolution
    • WNU

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