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| Titel: |
Geological affinities of the Glenelg river complex, western Victoria |
| Auteur: |
Anderson, J. A. C. Gray, C. M. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 41 (1994) nr. 2 pagina's 141-155 |
| Jaar: |
1994-04 |
| Inhoud: |
A detailed comparison between the Glenelg River Complex in the Wando Vale district of western Victoria and the South Australian Kanmantoo Group of the Mt Lofty Ranges reveals many common elements. As the basis of comparison the geology of Wando Vale is described concisely with emphasis on its magmatic and structural history. Both have similar metasedimentary rocks, which are siliciclastically dominated with a substantial calcareous component. Geochemically, these rocks are relatively rich in CaO and Na2O, and compositionally distinct from the mature turbidites of the Lachlan Orogenic Belt. Four deformational episodes are identified in the Glenelg River Complex and are comparable to the history of the Kanmantoo Group in the Tungkillo-Palmer region. The regional metamorphic zonation of both units extends into the amphibolite facies and is of the andalusite-sillimanite type with similar mineral crystallization sequences. Tholeiitic dykes with comparable timing, the geochemical affinities of mid-ocean ridge basalts, and distinctive high-alumina compositions are common to both areas. Six syntectonic granitic bodies (one tonalite and five granodiorites) intrude the metasedimentary rocks of Wando Vale; high Na2O and Sr contents indicate links with the Cambro-Ordovician syntectonic granitic rocks of South Australia. The isotopic ages of granites in the Glenelg River Complex constrain the timing of regional metamorphism, deformation and magmatism as comparable to that of the Delamerian Orogeny. The Glenelg River Complex is a distal equivalent of the Kanmantoo Group and thus the easternmost exposure of the Adelaide Orogenic Belt. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 11 gevonden artikelen
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