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| Titel: |
The southern Avoca fault zone: Site of a newly identified 'greenstone' belt in western Victoria |
| Auteur: |
Morand, V. J. Ramsay, W. R. H. Hughes, M. Stanley, J. M. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 42 (1995) nr. 2 pagina's 133-143 |
| Jaar: |
1995-04 |
| Inhoud: |
A discontinuous belt of metabasite ('greenstone') occurs along the southern extension of the Avoca Fault Zone, southwest of Ballarat, Victoria. This fault forms the boundary between the Stawell and Bendigo-Ballarat tectonic zones. In the Pitfield-Linton-Scarsdale area the 2 km-wide fault zone separates simply deformed ?Ordovician turbidites on the east from polydeformed ?Cambro-Ordovician turbidites of similar character to the west. Metabasites appear to be confined mainly to the eastern edge of the fault zone, but ground magnetic traverses suggest that fault slivers may exist in the western part of the fault zone. Kinematic indicators suggest that the southern Avoca Fault Zone is a steep westerly dipping thrust with west over east movement. Metamorphic grade in the area is greenschist facies, but the grade is slightly higher in the hangingwall, supporting a thrust sense of movement. The Pitfield metabasites are interpreted as an upthrust portion of a layer of ?Cambrian basic volcanics that underlies the Early Palaeozoic turbidite succession in the Stawell zone, similar to the Bendigo-Ballarat and Melbourne zones. These similarities place the Stawell zone in the Lachlan Fold Belt with the Bendigo-Ballarat and Melbourne zones. The boundary of the Lachlan and Adelaide Fold Belts thus lies to the west of the Stawell zone. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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