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

doi:10.1080/08120099208728005

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 journal › Article › peer-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 language	English
Pages (from-to)	111-114
Number of pages	4
Journal	Australian Journal of Earth Sciences
Volume	39
Issue number	1
DOIs	https://doi.org/10.1080/08120099208728005
Publication status	Published - 1992

Keywords

Hillgrove Plutonic Suite
Rb/Sr dates
Shear zones
Structural geology

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10.1080/08120099208728005

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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.",

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AU - Shaw, S. E.

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N2 - 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.

AB - 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.

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

Abstract

Keywords

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