|
| << vorige |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 9 van 9 gevonden artikelen
| Titel: |
Structural controls on the Cowarra gold deposit near Bredbo, southeastern New South Wales |
| Auteur: |
Rickard, M. J. McQueen, K. G. Hayden, P. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 43 (1996) nr. 2 pagina's 201-215 |
| Jaar: |
1996-04 |
| Inhoud: |
The Cowarra gold deposit is an epigenetic, structurally controlled, gold-bearing sulfide vein system in a regional shear zone developed within isoclinally folded Ordovician turbidites. Gold occurs mainly in sulfide-rich veins parallel to the axial cleavage or shears on fold limbs. There are seven sets of quartz veins, but they contain only minor gold. The mineralised shears lie within a zone of strong fold-plunge variation, in the chlorite zone of a regional metamorphic complex, and to the west of the Bega Batholith. However, gold is not related to metamorphic outflushing, but more likely to sulfide-rich fluids derived from depth during intrusion of I-type granites of the Michelago Igneous Complex. The local control for sulfide veining was decompressional dilation of axial planar structures shortly after folding and shearing; this is unlike the structural control described for most deposits from this and similar terrains. Subsequent normal, strike-slip and reverse fault movements in the shear zone develop separate quartz-vein arrays, but these are mostly barren of gold; there are no saddle reefs or fault-controlled gold veins as are common in other shear-zone deposits in Australia and Canada. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 9 gevonden artikelen
| << vorige |