The in-vitro "growth" of gold grains

Shuster, Jeremiah and Southam, Gordon (2015) The in-vitro "growth" of gold grains. Geology, 43 1: 79-82. doi:10.1130/G36241.1


Author Shuster, Jeremiah
Southam, Gordon
Title The in-vitro "growth" of gold grains
Journal name Geology   Check publisher's open access policy
ISSN 1943-2682
0091-7613
Publication date 2015-01
Year available 2015
Sub-type Article (original research)
DOI 10.1130/G36241.1
Open Access Status
Volume 43
Issue 1
Start page 79
End page 82
Total pages 4
Place of publication Boulder, CO United States
Publisher Geological Society of America
Collection year 2016
Language eng
Abstract Gold colloids, octahedral platelets, and foils, directly and indirectly formed from the reduction of soluble Au(I) thiosulfate and Au(III) chloride complexes by iron-oxidizing bacteria, cyanobacteria, and sulfate-reducing bacteria, were combined in an experimental system. This system represented simplified biogeochemical conditions occurring within a fluvial environment in which placer Au could occur. In this study, biofilm formation and physical aggregation (i.e., sedimentation processes) were critical for the accumulation of nanometer- to micrometer-sized Au particles into grains 4–5 mm in size. Characterization of grain surface textures by scanning electron microscopy in association with monitoring soluble Au concentrations over time suggested that dissolution and reprecipitation processes were occurring at the Au grain-fluid interface. This laboratory model demonstrates that the biogeochemical cycling of Au can contribute to the formation of anomalous enrichments such as placer Au deposits.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Papers
Official 2016 Collection
 
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