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| Titel: |
Remobilization of PGE in podiform chromitite in the Coolac Serpentinite Belt, Southeastern Australia |
| Auteur: |
Franklin, B. J. Marshall, B. Graham, I. T. McAndrew, J. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 39 (1992) nr. 3 pagina's 365-371 |
| Jaar: |
1992-07 |
| Inhoud: |
The Coolac Serpentinite Belt (CSB) is a subvertical, alpine-type ultramafic body within the Palaeozoic Lachlan Fold Belt of eastern Australia. Platinum-group elements (PGE) exist in two podiform chromitite bodies within the CSB. Brecciated chromite in both chromitite bodies has a main fracture-fill assemblage of lizardite-chrysotile-talc-magnesite. Opaque phases in fracture-fill include awaruite, trevorite and titaniferous magnetite and the sulphides heazlewoodite, polydymite and millerite. Chrome-bearing phases include ferritchromit, uvarovite (formation temperature 500°C+) and chromian clinochlore (formation temperature ∼300°C). The last group show that chromium was mobilized over a substantial temperature interval. Analytical data show that both the dunitic host rocks and the chromitites contain PGE and Au, but that the chromitites are more enriched in both. Minerals that contain PGE have not been identified within specific phases although analyses of Ni sulphides and awaruite occurring as fracture-fill minerals in chromite yield PGE values. Platinum-group element trends for the CSB chromitites appear to be different from those in other ophiolitic environments, which suggests that the PGE and possibly the Au within them have undergone subordinate non-magmatic metahydrothermal remobilization accompanying serpentinization. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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