Porphyry deposits of the Urals: Geological framework and metallogeny |
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| Institution: | 1. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences (IGEM RAS), Staromonetny per. 35, Moscow 119017, Russia;2. The Zavaritsky Institute of Geology and Geochemistry of the Ural Branch, Russian Academy of Sciences, Akademika Vonsovskogo str. 15, Yekaterinburg 620016, Russia;3. John de Laeter Centre for Isotopic Research & The Institute for Geoscience Research (TIGeR), Curtin University, Kent St, Bentley, WA 6102, Australia;4. Centre for Russian and Central Eurasian Mineral Studies (CERCAMS), Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. College of Earth Sciences, Chang''an University, Xi''an 710054, China;3. Laboratory of Geological Formations, K. Satpaev Institute of Geological Sciences, Almaty 050010, Kazakhstan;1. Institute of Mineralogy, Urals Branch, Russian Academy of Sciences, Miass, Chelyabinsk District 456317, Russia;2. South Urals State University, 8 iyulya str. 10, Miass, Chelyabinsk District 456317, Russia;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PR China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, PR China;3. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Geography, Chinese Academy of Sciences, Xinjiang 830011, PR China;4. Department of Geology, University of Leicester, Leicester LE1 7RH, UK;5. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, PR China;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;2. Geology Department, Lakehead University, 955 Oliver Rd, Thunder Bay, ON, P7B 5E1, Canada;3. John de Laeter Center, TIGeR, Dept. Applied Geology, Curtin University, Perth WA 6945, Australia;4. Laboratory of Geological Formations, K. Satpaev Institute of Geological Sciences, Almaty 050010, Kazakhstan |
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| Abstract: | Most of the Cu (± Mo,Au) porphyry and porphyry-related deposits of the Urals are located in the Tagil-Magnitogorsk, East-Uralian Volcanic and Trans-Uralian volcanic arc megaterranes. They are related to subduction zones of different ages:- (1)Silurian westward subduction: Cu-porphyry deposits of the Birgilda-Tomino ore cluster (Birgilda, Tomino, and Kalinovskoe) and the Zeleny Dol Cu-porphyry deposit;
- (2)Devonian Magnitogorsk eastward subduction and the subsequent collision with the East European plate: deposits and occurrences are located in the Tagil (skarn-porphyry Gumeshevskoe etc.) and Magnitogorsk terranes (Cu-porphyry Salavat and Voznesenskoe, Mo-porphyry Verkhne-Uralskoe, Au-porphyry Yubileinoe etc.), and probably in the Alapaevsk-Techa terrane (occurrences of the Alapayevsk-Sukhoy Log cluster);
- (3)Late-Devonian to Carboniferous subduction: deposits located in the Trans-Uralian megaterrane. This includes Late-Devonian to Early Carboniferous Mikheevskoe Cu-porphyry and Tarutino Cu skarn-porphyry, Carboniferous deposits of the Alexandrov volcanic arc terrane (Bataly, Varvarinskoe) and Early Carboniferous deposits formed dew to eastward subduction under the Kazakh continent (Benkala, etc.).
- (4)Continent-continent collision in Late Carboniferous produced the Talitsa Mo-porphyry deposit located in the East Uralian megaterrane.
Porphyry mineralization of the Magnitogorsk megaterrane shows an evolving relationship from gabbro-diorite and quartz diorite in the Middle Devonian (Gumeshevskoe, Salavat, Voznesenskoe) to granodiorite-plagiogranodiorite in the Late Devonian (Yubileinoe Au-porphyry) and finally to granodiorite in the Carboniferous (Talitsa Mo-porphyry) with a progressive increase in total REE, Rb and Sr contents. This corresponds to the evolution of the Magnitogorsk terrane from a volcanic arc which gave place to an arc-continent collision in the Famennian. |
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