Constraints on the timing of Pan-African granulite-facies metamorphism in the Kerala Khondalite Belt of southern India: SHRIMP mineral ages and Nd isotopic systematics

K. P. Shabeer, M. Satish-Kumar*, R. Armstrong, I. S. Buick

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    The supracrustal Kerala Khondalite Belt (KKB; southern India) constitutes an important but little understood terrain in the evolution of East Gondwana. Here we report SHRIMP U-Pb zircon and titanite ages for a suite of metasedimentary rocks from the KKB. Metamorphic ages at 530.2 ± 4.4 and 525 ± 4.5 Ma were obtained from metapelitic and metapsammitic migmatites, respectively. These ages are interpreted to date peak metamorphism because both rock types have extensively melted under granulite-facies conditions. A similar age (520 ± 4.7 Ma) was obtained from titanite from a granulite-facies calc-silicate rock. These ages are within error of SHRIMP ages for granulite-facies assemblages in Lützow-Holm Bay, East Antarctica, the Highland and Wanni Complexes of Sri Lanka, and Southern Madagascar. We propose that this timing reflects a short span (∼10 m.yr.) of high-temperature granulite-facies metamorphism and concomitant widespread migmatization that marks the final stage of collision between East and West Gondwana.

    Original languageEnglish
    Pages (from-to)95-106
    Number of pages12
    JournalJournal of Geology
    Volume113
    Issue number1
    DOIs
    Publication statusPublished - Jan 2005

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