Bozkaya, G, Banks, DA orcid.org/0000-0001-9118-5298 and Bozkaya, O (2019) The presence of colloidal gold in epithermal mineralizing fluids. In: Life with Ore Deposits on Earth, Proceedings vol 1. 15th biennial SGA Conference, 27-30 Aug 2019, Glasgow. Society for Geology Applied to Mineral Deposits , pp. 256-259. ISBN 9780852619629
Abstract
Transport of gold and silver as colloidal particles has been observed in c. 300OC low salinity fluids from the Arapucandere intermediate sulphidation epithermal base-metal-Au deposit in NW Turkey. Large euhedral quartz crystals, grew after the deposition of sulfides. Overgrowths have a fibrous texture which grew perpendicular to the existing crystal faces and facilitated trapping of large elongate fluid inclusions between the quartz fibres. Episodic trapping of fluid inclusions occurred throughout the growth of quartz. Trapped within primary fluid inclusions are numerous particles of gold, the largest observed is c. 1 μm but most are smaller. BSE element mapping show these to contain Au, Ag, Cu + Hg. LA-ICP-MS ablation of fluid inclusions confirms Au and Ag is not present in solution, occurring as numerous particles. The concentration of gold in fluid inclusions is orders of magnitude greater than has been previously measured or thought likely in crustal fluids. The average Ag concentration is c. 32 ppm and Au is c.41 ppm, but the maximum concentrations may reach several 100’s to 1000 ppm. Au-Ag particles could not have precipitated in the fluid inclusions, therefore have precipitated elsewhere and transported by the hydrothermal fluid.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Sep 2019 09:30 |
Last Modified: | 20 Sep 2019 09:30 |
Status: | Published |
Publisher: | Society for Geology Applied to Mineral Deposits |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:151138 |