Vein deflections and thickness variations of epithermal quartz veins as indicators of fracture coalescence

Nortje, G.S., Rowland, J.V., Spörli, K.B., Blenkinsop, T.G., and Rabone, S.D.C. (2006) Vein deflections and thickness variations of epithermal quartz veins as indicators of fracture coalescence. Journal of Structural Geology, 28 (8). pp. 1396-1405.

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Abstract

Epithermal quartz veins at the Broken Hills gold deposit, New Zealand, strike N-S and dip steeply westward. Small changes in the orientations of the three main lodes and associated mesoscopic veins define deflection lines that rake steeply in the vein plane. A method of constructing the opening vector from the three-dimensional geometry of a vein deflection is presented. The resulting vectors plunge steeply and are at low angles to the main veins and the deflection lines, indicating a large component of normal dip-slip shear during the opening of these veins. Vein thickness distributions are power-law, with similar fractal dimensions to previously reported values for non-stratabound vein arrays. The vein system at Broken Hills developed by linking of isolated extension-dominated shear veins with shear-dominated veins, generating sub-vertical and sub-horizontal fluid flow pathways.

Item ID: 4632
Item Type: Article (Refereed Research - C1)
Keywords: opening vector; vein deflection; fluid flow; normal dip-slip; extension veins; epithermal; extensional shears; fault linkage
ISSN: 0191-8141
Date Deposited: 16 Jun 2009 23:54
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840105 Precious (Noble) Metal Ore Exploration @ 100%
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