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Pb–Pb zircon ages of Archaean metasediments and gneisses from the Dharwar craton, southern India: Implications for the antiquity of the eastern Dharwar craton

MAIBAM, B ; GOSWAMI, J N ; SRINIVASAN, R

Journal of Earth System Science, 2011-08, Vol.120 (4), p.643-661 [Periódico revisado por pares]

India: Springer-Verlag

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  • Título:
    Pb–Pb zircon ages of Archaean metasediments and gneisses from the Dharwar craton, southern India: Implications for the antiquity of the eastern Dharwar craton
  • Autor: MAIBAM, B ; GOSWAMI, J N ; SRINIVASAN, R
  • Assuntos: Age ; Cratons ; Data processing ; Earth and Environmental Science ; Earth Sciences ; Earth, ocean, space ; Evolution ; Exact sciences and technology ; Ions ; Lead ; Lead isotopes ; Radiometric dating ; Sediments ; Space Exploration and Astronautics ; Space Sciences (including Extraterrestrial Physics ; Zircon ; Zirconium
  • É parte de: Journal of Earth System Science, 2011-08, Vol.120 (4), p.643-661
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: 207 Pb– 206 Pb ages of zircons in samples of metasediments as well as ortho- and para-gneisses from both the western and the eastern parts of the Dharwar craton have been determined using an ion microprobe. Detrital zircons in metasedimentary rocks from both yielded ages ranging from 3.2 to 3.5 Ga. Zircons from orthogneisses from the two parts also yielded similar ages. Imprints of younger events have been discerned in the ages of overgrowths on older zircon cores in samples collected throughout the craton. Our data show that the evolution of the southwestern part of eastern Dharwar craton involved a significant amount of older crust (>3.0 Ga). This would suggest that crust formation in both the western and eastern parts of the Dharwar craton took place over similar time interval starting in the Mesoarchaean at ca. 3.5 Ga and continuing until 2.5 Ga. Our data coupled with geological features and geodynamic setting of the Dharwar craton tend to suggest that the eastern Dharwar craton and the western Dharwar craton formed part of a single terrane.
  • Editor: India: Springer-Verlag
  • Idioma: Inglês
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