Abstract
A simplified scheme to categorise quartz vein morphology from gold deposits is based on the growth direction of quartz or pseudomorphed chalcedony in the veins. The categories are scale-independent and are: (1) face-control, (2) displacement-control, (3) parallel-control, (4) radiating, (5) non-directional control, (6) replacement, and (7) modified. Quartz vein textures do not indicate any particular type of mineralisation. For the depth continuum of Archaean lode-gold deposits of the Yilgarn Craton all seven categories of texture are variously present. However, crustal depth is a major control. Parallel and radiating textures are characteristic of gold deposits formed at the near surface; displacement and non-directional control are typical of deposits at midcrustal (greenschist and amphibolite) conditions; and face-control shows a range of conditions from the near surface to midcrustal. Replacement and modified textures embrace a wide variety of alteration and deformation conditions, and can occur in gold deposits at all crustal levels.
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