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.

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