Price, J. J., Blenkinsop, T. G., Kerr, A. C., Goodenough, K. M., Boyce, A. J. and Kuehnapfel, C. (2019) Reverse Shear, Horizontal Shortening and Lode-gold Mineralisation along the Mougooderra Shear Zone, Western Australia. In: 15th SGA Biennial Meeting on Life with Ore Deposits on Earth, Glasgow, Scotland, 27-30 Aug 2019, pp. 639-642. ISBN 9780852619636
Full text not currently available from Enlighten.
Publisher's URL: https://www.sga2019glasgow.com/abstract
Abstract
Exploration for lode-gold deposits in the Archaean Yalgoo-Singleton greenstone belt of Western Australia is difficult, due to widespread, thick transported cover blanketing the bedrock from the surface. This study has employed detailed structural logging of core drilled along the unexposed Mougooderra Shear Zone, primarily from the 400 koz Silverstone deposit, in order to characterize the style of mineralisation present. Structural analyses at Silverstone reveals reverse kinematics of a steep (similar to 65 degrees) west-dipping shear zone, with associated veining of two principal types: foliation-parallel shear veins and extensional flat veins. Mineralisation conforms to the fault-valve model, whereby highly pressured fluids are responsible for reverse shear along a steeply inclined structure. Similar analysis on another deposit on a splay structure also demonstrates fault-valve style mineralisation, suggesting most lode-gold deposits in the belt formed during the same contractional episode. This is supported by preliminary S isotope data. A paragenetic study has revealed two discrete phases of gold associated with arsenopyrite and ullmannite (NiSbS) at Silverstone, associated with intense carbonate alteration in mafic and ultramafic host rocks. A better understanding of mineralisation style and paragenesis will help to provide a revised rationale to underpin exploration in a highly-prospective area.
| Item Type: | Conference Proceedings |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Boyce, Professor Adrian |
| Authors: | Price, J. J., Blenkinsop, T. G., Kerr, A. C., Goodenough, K. M., Boyce, A. J., and Kuehnapfel, C. |
| College/School: | College of Science and Engineering > Scottish Universities Environmental Research Centre |
| ISBN: | 9780852619636 |
University Staff: Request a correction | Enlighten Editors: Update this record
Deposit and Record Details
Deposit and Record Details