http://www.sciencedirect.com/science/article/pii/S1674987111000508 |
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Authors: | Yanhua Zhang J. Robinson P.M. 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 structuralcontrols on hydrothermal mineralization. We first give an overview of natural phenomena ofstructurally-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 comparisonwith 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 inNorth Queensland (Australia). Two modelling approaches, discrete deformation modelling andcontinuum coupled deformation and fluid flow modelling, are involved. The 2D model-derived patternsare remarkably consistent with the Cu-vein structure from the Shilu Copper deposit, and show thatboth modelling approaches can realistically simulate the mechanical behaviours of shear and dilatantfractures. The continuum coupled deformation and fluid flow model indicates that pattern of the Cuveinsnear the Shilu deposit is the result of shear strain localization, development of dilation and fluidfocussing into the dilatant fracture segments. The 3D case-study models (with deformation and fluidflow coupling) on the Hodgkinson Province generated a number of potential gold mineralizationtargets. |
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Keywords: | Structural control Dilation Fluid flow Mineralization Numerical modelling Shilu Cu-deposit Hodgkinson Province |
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