Au-bearing gabbro-tonalite-granodiorite-granite plutons of the urals: Age,geochemistry, and magmatic and ore evolution |
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| Authors: | G B Fershtater V V Kholodnov A A Kremenetsky A A Krasnobaev N S Borodina E A Zin’kova S V Pribavkin |
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| Institution: | (1) GNS Science, Private Bag 1930, Dunedin, New Zealand;(2) Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA;(3) Department of Geological Sciences, San Diego State University, San Diego, CA 92182, USA;(4) GEMOC Key Centre, Macquarie University, Sydney, NSW, 2109, Australia;(5) Department of Earth, Atmospheric & Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;(6) Present address: Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia |
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| Abstract: | Gabbro-tonalite-granodiorite-granite (GTGG) plutons productive for gold are suprasubduction intrusive bodies formed at an
Andean-type active continental margin 410–380, 365–355, and 320–290 Ma ago. The Devonian plutons are situated in the southeastern
marginal continental zone, whereas the Carboniferous plutons occur in the northwestern zone. All GTGG plutons are mantle-crustal.
Their formation started with hydrous basic magmatism and was accompanied by such magmatism up to the final stage. Mantle-derived
amphibole gabbro and diorite experienced partial melting (anatexis) in the lower crust under a pressure of 6–10 kbar, giving
birth to the tonalite-granodiorite members of the GTGG series. The latter, in turn, were involved in anatexis with the formation
of adamellite and granite, immediately accompanied by hydrothermal gold mineralization. The multistep anatexis is the main
petrogenetic process responsible for the gold resource potential of GTGG plutons. In the process of anatexis occurring under
high fluid saturation, gold was repeatedly removed from rocks into fluid, facilitating its concentration in ore deposits. |
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