Nortje, G. S., Rowland, J. V., Sporli, K. B., Blenkinsop, Thomas G. ![]() |
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 Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Earth and Environmental Sciences |
Subjects: | Q Science > QE Geology |
Uncontrolled Keywords: | Opening vector; Normal dip-slip; Vein deflection; Extension veins; Extensional shears; Fault linkage; Fluid flow; Epithermal |
Publisher: | Elsevier |
ISSN: | 0191-8141 |
Last Modified: | 24 Oct 2022 12:07 |
URI: | https://orca.cardiff.ac.uk/id/eprint/50612 |
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