Geology of the World’s Major Gold Deposits and Provinces

Chapter 38: Hydrothermal Gold Deposition in Epithermal, Carlin, and Orogenic Deposits
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Published:January 01, 2020
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Stuart F. Simmons, Benjamin M. Tutolo, Shaun L.L. Barker, Richard J. Goldfarb, François Robert, 2020. "Chapter 38: Hydrothermal Gold Deposition in Epithermal, Carlin, and Orogenic Deposits", Geology of the World’s Major Gold Deposits and Provinces, Richard H. Sillitoe, Richard J. Goldfarb, François Robert, Stuart F. Simmons
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Abstract
Epithermal, Carlin, and orogenic Au deposits form in diverse geologic settings and over a wide range of depths, where Au precipitates from hydrothermal fluids in response to various physical and chemical processes. The compositions of Au-bearing sulfidic hydrothermal solutions across all three deposit types, however, are broadly similar. In most cases, they comprise low-salinity waters, which are reduced, have a near-neutral pH, and CO2 concentrations that range from <4 to >10 wt %. Experimental studies show that the main factor controlling the concentration of Au in hydrothermal solutions is the concentration of reduced S, and in the absence...
- Australasia
- Carlin Trend
- carlin-type deposits
- Eh
- epithermal processes
- gold ores
- heavy mineral deposits
- hydrothermal alteration
- magmas
- metal ores
- metasomatism
- mineral deposits, genesis
- mineralization
- Nevada
- New Zealand
- North Island
- orogenic belts
- pH
- sulfides
- Taupo
- Taupo volcanic zone
- tectonics
- United States