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| Titel: |
Genesis of greenstone-hosted Cu-Au mineralisation at Hill 800, Mt Useful Slate Belt, eastern Victoria |
| Auteur: |
Morey, A. A. Bierlein, F. P. Cherry, D. P. Turner, G. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 49 (2002) nr. 5 pagina's 787-799 |
| Jaar: |
2002-10 |
| Inhoud: |
A group of structurally emplaced Cambrian metavolcanic inliers, informally known as the Barkly River greenstones, in the Mt Useful Slate Belt, eastern Victoria, host several base- and precious-metal anomalies. To date, the most significant anomaly is the Hill 800 prospect, where disseminated and stockwork/stringer chalcopyrite + sphalerite + galena ± native Au mineralisation have been recognised. This ore assemblage is hosted by andesitic lavas and breccias and is syngenetic to pretectonic in origin. Deformation fabrics as well as unmineralised, low-temperature, quartz ± carbonate veins overprint the ore minerals. Spectacular gossan exposures and intense paragonite + chlorite + muscovite hydrothermal alteration zones are associated with the known extent of the mineralisation. Field relations, geochemical, petrographic, isotopic and fluid-inclusion studies indicate that ore genesis is closely related to a volcanic-hosted massive sulfide (VHMS) system, although certain characteristics resemble a porphyry-Cu style of mineralisation. Comparisons of these findings with other ore systems suggest that Hill 800 is a 'hybrid' system transitional between a VHMS and porphyry-Cu style of mineralisation. Moreover, the host rocks are analogous with the economically important Mt Read Volcanic Complex of western Tasmania. These findings emphasise that the Cambrian greenstones can potentially represent a new base- and precious-metal mineral province of Victoria. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 10 gevonden artikelen
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