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

Nortje, G. S., Rowland, J. V., Sporli, K. B., Blenkinsop, Thomas G. ORCID: https://orcid.org/0000-0001-9684-0749 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 Type:	Article
Date Type:	Publication
Status:	Published
Schools:	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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