The role of transient pressure gradients in mid-crustal advective mass transfer
Oliver, Nicholas H.S., Bastrakov, Evgeniy N., Rubenach, Michael J., and Marshall, Lucas J. (2003) The role of transient pressure gradients in mid-crustal advective mass transfer. Journal of Geochemical Exploration, 78. pp. 183-186.
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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-Cusingle bondAu 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.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||mineralisation; dilatancy; geochemical model; pore pressure|
|Date Deposited:||18 Sep 2009 02:03|
|FoR Codes:||04 EARTH SCIENCES > 0403 Geology > 040306 Mineralogy and Crystallography @ 100%|
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%|
|Citation Count from Web of Science||