Orogenic gold mineral systems of the Western Lachlan Orogen (Victoria) and the Hodgkinson Province (Queensland): Crustal metal sources and cryptic zones of regional fluid flow |
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| Institution: | 1. Geological Survey of Queensland, PO Box 15216, City East, QLD 4002, Australia;2. Centre for Exploration Targeting, School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia;3. Department of Geological Sciences, Stockholm University, Stockholm 10691, Sweden;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. Open Laboratory of Orogenic and Crustal Evolution, Peking University, Beijing 100871, China;3. Henan Provincial Non-ferrous Metals Geological and Mineral Resources Bureau, Zhengzhou 450016, China;1. CSIRO Mineral Resources, Australian Resources Research Centre, 26 Dick Perry Avenue, Kensington, WA 6151, Australia;2. Armour Energy Limited, Level 27, 111 Eagle Street, Brisbane, QLD 4000, Australia;1. Centre for Exploration Targeting, University of Western Australia, 35 Stirling Highway, Crawley WA6009, Australia;2. Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia;3. Dept Earth & Atmospheric Sciences, University of Alberta, 126 Earth Sciences Building, Edmonton, AB T6G 2R3, Canada;4. Centre for Russian and Central EurAsian Mineral Studies (CERCAMS), Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK;1. CSRE, Indian Institute of Technology Bombay, Powai, 400076 Mumbai India;2. Centre for Exploration Targeting, University of Western Australia, Crawley 6009, WA, Australia;3. Department of Earth and Oceans, James Cook University, Townsville, Queensland, Australia |
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| Abstract: | Orogenic gold mineral systems in the Western Lachlan Orogen (Victoria) and the Hodgkinson Province (Queensland) produced gold provinces characterised by vastly different scales of gold endowment and strongly uneven distribution of gold mineralisation within each province. The volume of hydrous pyrite-bearing rocks undergoing metamorphic devolatilisation during thermo-tectonic events driving orogenic gold mineral systems represents a fundamental first-order constraint on the total gold endowment and its broad spatial distribution, both between and within the provinces. Most of the largest gold deposits in both regions occur in linear, richly-endowed metallogenic zones, oblique to the dominant regional structures and related to deep crustal domain boundaries. These boundaries, with only subtle surface expressions, were the major regional structural controls which promoted focused near-vertical flow of mineralising metamorphic fluids above the outer margins of cratonic blocks in the lower crust. Recognised major faults represented only more local scale and often indirect controls on the focused fluid flow, particularly effective above the deep cratonic block boundaries overlain by relatively thick crustal source rocks. |
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