The role of transient pressure gradients in mid-crustal advectivemass transfer

Abrupt pore pressure changes accompanying faulting can compete with, or locally predominate over, thermal gradients, in their capacity to transfer mass in deep hydrothermal systems. Differential mass transfer at 1- to >1000-m scales in the mesothermal Cloncurry Fe oxide-Cu Au district of northern...

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Bibliographic Details
Published in:Journal of geochemical exploration 2003-05, Vol.78, p.183-186
Main Authors: Oliver, Nicholas H.S., Bastrakov, Evgeniy N., Rubenach, Michael J., Marshall, Lucas J.
Format: Article
Language:English
Subjects:
Dilatancy
Geochemical model
Mineralisation
Pore pressure
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Summary:Abrupt pore pressure changes accompanying faulting can compete with, or locally predominate over, thermal gradients, in their capacity to transfer mass in deep hydrothermal systems. Differential mass transfer at 1- to >1000-m scales in the mesothermal Cloncurry Fe oxide-Cu Au district of northern Australia was apparently controlled by pore pressure cycling around dilatant parts of shear and fault zones. Geochemical reaction modelling of pore pressure drops in fluids initially equilibrated with altered wallrocks in the Cloncurry district produces model vein assemblages that mimic those observed in the field, whereas temperature-drop scenarios fail to replicate these veins.
ISSN:0375-6742
1879-1689
DOI:10.1016/S0375-6742(03)00128-6