Isotopic dating of Neoproterozoic crustal growth in the Usambara Mountains of northeastern Tanzania: Evidence for coeval crust formation in the Mozambique Belt and the Arabian-Nubian Shield

M. A.H. Maboko, E. Nakamura

    Research output: Contribution to journalArticlepeer-review

    26 Citations (Scopus)

    Abstract

    Granulite-facies orthogneisses of andesitic to dacitic composition in the Usambara Mountains of north eastern Tanzania yield a Sm-Nd whole rock isochron age of 815 ± 58 Ma and an initial ε(Nd) value of 4.1. This age is interpreted as dating Sm-Nd fractionation during extraction from the mantle and immediate subsequent crystallisation of the granulite protolith during an event of regional calc-alkaline magmatism in the area. Isotopic and geochemical characteristics of the rocks are consistent with a convergent margin setting for the magmatism with minimal contamination by older continental crust. The isotopic data from the Usambara Mountains demonstrate that Neoproterozoic crust formation in the Arabian-Nubian Shield and parts of the Mozambique Belt was broadly contemporaneous.

    Original languageEnglish
    Pages (from-to)227-242
    Number of pages16
    JournalPrecambrian Research
    Volume113
    Issue number3-4
    DOIs
    Publication statusPublished - Jan 31 2002

    Keywords

    • Crust formation
    • Granulites
    • Mozambique Belt
    • Sm-Nd geochronology
    • Tanzania

    ASJC Scopus subject areas

    • Geology
    • Geochemistry and Petrology

    Fingerprint

    Dive into the research topics of 'Isotopic dating of Neoproterozoic crustal growth in the Usambara Mountains of northeastern Tanzania: Evidence for coeval crust formation in the Mozambique Belt and the Arabian-Nubian Shield'. Together they form a unique fingerprint.

    Cite this