The role of early formed structures on the development of the world class St Ives Goldfield,Yilgarn, WA |
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Authors: | John Miller Richard Blewett Janet Tunjic Karen Connors |
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Institution: | 1. Centre for Exploration Targeting, UWA, 35 Stirling Highway, M006, Crawley, Western Australia 6009, Australia;2. Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia;3. St Ives Gold Mining Co, Gold Fields Australia, Kambalda Post Office, WA 6444, Australia;4. FrOG Tech, 2 King Street, Deakin, ACT 2600, Australia |
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Abstract: | A revised structural interpretation for the Victory to Kambalda area of the world class St Ives Goldfield in the Archean Yilgarn Craton has mapped out the distribution of WNW-trending faults within this area of the field. These previously cryptic WNW-trending structures had been identified in gravity data, and also by isopach thickness variations. The WNW-trending faults acted as transfers syn-gold mineralization, although only discrete segments of these faults were active during the main stage of gold mineralization. Where mineralized, the faults transferred strain from a complex combination of block-on-block movement associated with thrusting and strike-slip movement on NW- and N-trending faults. Along some segments N-trending mineralized faults terminate against the WNW-trending faults. Many of the WNW-trending faults correlate with major strike changes on regional and camp-scale faults and they are domain boundaries for the critical N-trending fault segments that host high-grade gold within contractional jogs. The WNW-trending faults also show evidence for an older deformation history prior to main-stage gold, which may extend back to early basin development associated with ultramafic and mafic volcanism. They are inferred to have been a series of early WNW-trending normal faults and breached relay ramps associated with oblique rifting along an older NNW-trending basement boundary. |
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Keywords: | Gold Structure Early architecture Yilgarn |
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