The relative effects of deformation and thermal advection on fluid pathways in basin-related mineralization

McLellan, John G., Oliver, Nicholas H.S., and Hobbs, Bruce E. (2006) The relative effects of deformation and thermal advection on fluid pathways in basin-related mineralization. Journal of Geochemical Exploration, 89 (1-3). pp. 271-275.

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The migration of basinal brines into basement material has been proposed as a means of scouring or leaching metals for subsequent ore deposition. Here we address this issue by numerically examining competing processes, namely deformation, fluid flow and thermal gradients, to describe potential fluid pathways leading to enrichment of metals and ore deposition. Stable convective fluid patterns may be established across the cover/basement interfaces if permeability contrasts are minimized, however, at the onset of extensional deformation these convective patterns quickly collapse. On cessation of the deformation, convection cells again develop, which are oscillatory with time. Input to the thermal budget from a radiogenic heat source suggests that basinal fluids can be drawn down around the margins of granite intrusions and fluid mixing processes may take place due to small and localised convective patterns. Fluid migration from basin into basement and back is highly likely given the right conditions, however, the rate and extent of fluid flow are determined by thermal and deformation processes.

Item ID: 4601
Item Type: Article (Research - C1)
ISSN: 0375-6742
Keywords: numerical models; advection; mineralization; basin; fluid flow
Date Deposited: 15 Sep 2009 04:06
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8499 Other Mineral Resources (excl. Energy Resources) > 849999 Mineral Resources (excl. Energy Resources) not elsewhere classified @ 100%
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