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Vein mineralization at the Damang Gold Mine, Ghana: controls on mineralization

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Tunks, AJ and Selley, D and Rogers, J and Brabham, G (2004) Vein mineralization at the Damang Gold Mine, Ghana: controls on mineralization. Journal of Structural Geology, 26 (6-7). pp. 1257-1273. ISSN 0191-8141

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Abstract

Two distinct styles of Au mineralization occur at the Damang Gold Mine; Palaeoproterozoic sediments of the Tarkwaian Group host both. One style of mineralization is stratabound within quartz-lithic conglomerates of the Banket Series. The second style of mineralization is associated with an extensive low-displacement, fault-fracture mesh that formed in a compressional stress regime late in the deformational history and after the peak metamorphism. Regional deformation within the Tarkwaian involved initial NW-SE directed shortening (D1). A major NNE-trending F1 anticline hosts the Damang orebody. Broadly N-S shortening during D2 resulted in the formation of E-W-trending thrusts with small displacements. The D3 shortening direction was similar to that of D1. Steep D1 faults were reactivated and a new set of low angle thrusts and associated flat-lying extension veins were formed. The bulk of the mineralization observed at Damang is associated with the low displacement D3 fault fracture mesh. The presence of flat-lying extensional veins and the reactivation of some misoriented D1 structures is indicative of periodic episodes of supralithostatic fluid pressures, low differential stress and fault-valve behavior towards the end of the deformation history.

Item Type: Article
Keywords: Fault fracture mesh; Birimian; Tarkwaian; Gold mineralisation; Damang; West Africa
Journal or Publication Title: Journal of Structural Geology
Page Range: pp. 1257-1273
ISSN: 0191-8141
Identification Number - DOI: 10.1016/j.jsg.2003.11.005
Additional Information: The definitive version is available at http://www.elsevier.com/locate/jsg
Date Deposited: 14 Feb 2007
Last Modified: 18 Nov 2014 03:13
URI: http://eprints.utas.edu.au/id/eprint/756
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