http://www.sciencedirect.com/science/article/pii/S1674987111000508 |
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Authors: | Yanhua Zhang J Robinson PM Schaubs |
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Affiliation: | CSIRO Earth Sciences and Resource Engineering, PO Box 1130, Bentley, WA 6102, Australia |
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Abstract: | This paper presents the results of a set of numerical models focussing on structural
controls on hydrothermal mineralization. We first give an overview of natural phenomena of
structurally-controlled ore formation and the background theory and mechanisms for such controls.
We then provide the results of a group of simple 2D numerical models validated through comparison
with Cu-vein structure observed near the Shilu Copper deposit (Yangchun, Guangdong Province,
China) and finally a case study of 3D numerical modelling applied to the Hodgkinson Province in
North Queensland (Australia). Two modelling approaches, discrete deformation modelling and
continuum coupled deformation and fluid flow modelling, are involved. The 2D model-derived patterns
are remarkably consistent with the Cu-vein structure from the Shilu Copper deposit, and show that
both modelling approaches can realistically simulate the mechanical behaviours of shear and dilatant
fractures. The continuum coupled deformation and fluid flow model indicates that pattern of the Cuveins
near the Shilu deposit is the result of shear strain localization, development of dilation and fluid
focussing into the dilatant fracture segments. The 3D case-study models (with deformation and fluid
flow coupling) on the Hodgkinson Province generated a number of potential gold mineralization
targets. |
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Keywords: | Structural control Dilation Fluid flow Mineralization Numerical modelling Shilu Cu-deposit Hodgkinson Province |
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