Tectonic implications of two rb/sr biotite dates for the tia granodiorite, Southern New England fold belt, NSW, Australia

P. H. Dirks, P. G. Lennox, S. E. Shaw

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    New Rb/Sr biotite dates for the Tia Granodiorite of 264 ± 2.6 Ma and 262 ± 2.6 Ma are considerably younger than the 290 ± 4 Ma Rb/Sr whole rock dates from the Hillgrove Plutonic Suite (including the Tia Granodiorite). The whole rock dates mark the approximate emplacement age of the plutons. The Tia Granodiorite exhibits two distinct biotite fabrics both of which formed during west over east movements on a ductile shear zone directly east of the pluton. Structural analysis suggests that the earliest fabric, formed synchronous with emplacement of the granodiorite in the hanging wall of the ductile shear zone. The later fabric probably formed during a major faulting event that juxtaposed this area against unmetamorphosed Permian strata of the Manning Basin to the west and the Yarrowitch Block to the east.

    Original languageEnglish
    Pages (from-to)111-114
    Number of pages4
    JournalAustralian Journal of Earth Sciences
    Volume39
    Issue number1
    DOIs
    Publication statusPublished - 1992

    Keywords

    • Hillgrove Plutonic Suite
    • Rb/Sr dates
    • Shear zones
    • Structural geology

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