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Modélisations thermiques de gisements orogéniques mésothermaux: application au Ghana

Abstract : This thesis deals with thermal processes and fluid flow regimes leading to the genesis of mesothermal gold deposits.
Two numerical modelling approaches have been used, a regional one, characterising the conductive thermal regime before mineralisation and a local one adding hydrothermal convection contemporaneous to mineralisation. Models are applied to the Palaeoproterozoic ore deposits of the Ashanti belt in Ghana which are representative of giant mesothermal gold deposits. From the results, the deduced value for the mantle heat flow is 30 mW.m-2 in accordance with the presence of a mantle plume in the region around 2 Ga. Taking into account the temperature-dependence of thermal conductivity is essential in order not to overestimate the deduced value. Regions potentially favourable to gold precipitation are identified and it appears that faulted zones where fluid flow are 3D lead to a spatial periodicity of ore deposits coherent with field data.
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Contributor : Virginie Harcouët <>
Submitted on : Friday, November 4, 2005 - 2:56:30 PM
Last modification on : Wednesday, December 9, 2020 - 3:11:27 PM
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  • HAL Id : tel-00010834, version 1


Virginie Harcouët. Modélisations thermiques de gisements orogéniques mésothermaux: application au Ghana. Géophysique [physics.geo-ph]. Institut de physique du globe de paris - IPGP, 2005. Français. ⟨tel-00010834⟩



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