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Episodic modes of operation in hydrothermal gold systems: Part II. A model for gold deposition

By
Bruce E. Hobbs
Bruce E. Hobbs
CSIRO, Perth 6102, Western Australia, AustraliaCentre for Exploration Targeting, University of Western Australia, WA 6009, Australia
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Alison Ord
Alison Ord
Centre for Exploration Targeting, University of Western Australia, WA 6009, AustraliaSchool of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
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Published:
January 01, 2018

Abstract

Coupling between the physical processes intrinsic to a hydrothermal system can lead to episodic and chaotic behaviour. Such behaviour includes variations in both space and time of the temperature, fluid pressure and activity of H2S, which result in the deposition of alteration mineral assemblages, zoned pyrite and gold; these variations are multifractal. In particular, the coupling of deformation and simultaneous endothermic and exothermic reactions with fluid flow leads to the highly localized deposition of gold. We discuss the physical and chemical mechanisms for such episodic and localization behaviour and explore the non-linear dynamic reasons why such mechanisms are recorded in the multifractal paragenetic sequence and deformation history. The synchronization of intrinsic episodicity as described here and extrinsic forcing induced by episodic seismicity provides another mechanism for enhancing the yield of gold deposition processes and hence the grade of orogenic gold deposits.

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Contents

Geological Society, London, Special Publications

Characterization of Ore-Forming Systems from Geological, Geochemical and Geophysical Studies

K. Gessner
K. Gessner
Geological Survey of Western Australia, Australia
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T.G. Blenkinsop
T.G. Blenkinsop
Cardiff University, UK
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P. Sorjonen-Ward
P. Sorjonen-Ward
Geological Survey of Finland, Finland
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Geological Society of London
Volume
453
ISBN electronic:
9781786203342
Publication date:
January 01, 2018

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