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| Titel: |
Delamerian Glenelg tectonic zone, western Victoria: geology and metamorphism of stratiform rocks |
| Auteur: |
Gray, C. M. Kemp, A. I. S. Anderson, J. A. C. Bushell, D. J. Ferguson, D. J. Fitzherbert, J. Stevenson, M. D. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 49 (2002) nr. 2 pagina's 187-200 |
| Jaar: |
2002-04 |
| Inhoud: |
The Cambro-Ordovician Glenelg tectonic zone of western Victoria is a distinctive metamorphic-igneous segment of the Delamerian Orogenic Belt comprising two northwest-striking regional metamorphic segments of andalusite-sillimanite type prograding towards an axial granitic batholith. The second of five deformations (D2) was most significant, producing isoclinal folds, transposition and a pervasive regional foliation (S2). Southwest of the central batholith, biotite to migmatite zones contain mainly quartzo-feldspathic rock (turbiditic metagreywacke, quartzo-feldspathic schist and migmatite), plus less common metaquartzite and calc-silicate rocks and minor metapelite. Metagabbro, metadolerite and amphibolite typically have the chemistry of mid-ocean ridge basalts. Serpentinite pods and sheets were tectonically introduced to low-grade areas. Northeast of the central batholith, quartzo-feldspathic rock occupies the sillimanite and migmatite zones exclusively, with a regional concentration of pegmatites adjacent to the zone boundary. Gross interleaving of quartzo-feldspathic schist, migmatite, pegmatite and muscovite-bearing granitic rock is characteristic. Peak metamorphic conditions of 550 MPa at 640°C leading to migmatite formation were established by D2 time and accompanied by tonalite-granodiorite and pegmatite emplacement. Subsequently, the thermal high contracted to the northeast culminating in the more extensive syn-, post-D4 to pre-D5 granitic magmatism. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 15 gevonden artikelen
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