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Book Chapter

Supergene Gold Mobility: A Textural and Geochemical Study from Gold Placers in Southern New Zealand

By
Donna M. Falconer
Donna M. Falconer
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Dave Craw
Dave Craw
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Published:
January 01, 2009

Abstract

Scanning electron microscopy was used to observe a variety of gold remobilization textures and authigenic gold overgrowths on detrital gold particles associated with quartz pebble conglomerates (QPC) from two localities in eastern Southland, New Zealand. Gold spheroids, spheroids with budlike protrusions, polyspheroidal aggregates, budded mass structures, and pseudohexagonal plates are common on detrital gold particles at these two sites. There has been no anthropogenic introduction of mercury or amalgam at either site. Some gold precipitation textures can be distinguished from some gold dissolution textures. Precipitation textures are characterized by surface textures and pure gold rims that occur on the outermost margin of sharply defined silver (± mercury)-depleted rims in most detrital particles. In contrast, dissolution textures are characterized by varying degrees of dissolution occurring preferentially along subgrain boundaries, thereby revealing the polycrystalline makeup of placer gold. Surface textures reflect a close association between gold precipitation and gold dissolution which may lead to the ambiguity inherent in interpreting gold-remobilization textures from placer environments.

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Contents

Special Publications of the Society of Economic Geologists

Supergene Environments, Processes, and Products

Spencer R. Titley
Spencer R. Titley
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Society of Economic Geologists
Volume
14
ISBN electronic:
9781629490380
Publication date:
January 01, 2009

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