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The initial 187Os/188Os of these deposits vary but seem to have more crustal signatures than the Witwatersrand deposits.
Data support gold deposition from leaching of gold and Os via hydrothermal fluids from crustal lithologies.
With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.Rhenium shows in its compounds a wide variety of oxidation states ranging from −1 to 7.Discovered in 1908, rhenium was the second-last stable element to be discovered. Nickel-based superalloys of rhenium are used in the combustion chambers, turbine blades, and exhaust nozzles of jet engines.Os concentration and Re/Os data of gold show systematic variation with the age of the deposit.These trends may result from a decrease in the efficiency of partial melts to extract juvenile gold and Os from the cooling mantle and the increasing importance of recycling gold from pre-existing continental crust. Digital access to this material is made possible by the University Libraries, University of Arizona.