naa a22 4500 510736327 CHVBK 20180411083011.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1134/S1075701513030021 doi (NATIONALLICENCE)springer-10.1134/S1075701513030021 PGE mineralization of dunite-wehrlite massifs at the Gutara-Uda interfluve, Eastern Sayan [Elektronische Daten] [A. Mekhonoshin, N. Tolstykh, M. Podlipsky, T. Kolotilina, A. Vishnevsky, Yu. Benedyuk] The Pt-Pd and Au-Ag mineralization hosted in both wehrlite without visible links to sulfide mineralization (dispersed assemblage of the Tartai massif) and disseminated Cu-Ni sulfide ore (ore assemblage of the Ognit massif) was found in dunite-wehrlite massifs localized in the fold framework of the Siberian Craton. The Pt minerals in both assemblages comprise sperrylite (PtAs2) and secondary Pt-Fe-Ni alloys in the Ognit massif and Pt-Fe-Cu and Pt-Cu alloys in the Tartai massif. The Pd minerals are widespread in the ore assemblages as compounds with Te, Sb, and Bi, whereas in the dispersed assemblage Pd is concentrated primarily in Pd-Cu-Sb compounds. Both assemblages are characterized by similar substitution of sperrylite with orcelite (Ni5 − xAs2) and then with secondary Pt-Fe-Ni or Pt-Fe-Cu and Pt-Cu alloys; the occurrence of Au-Ag alloys with prevalence of Ag over Au; and replacement of them with auricupride (Cu3Au) at the late stage. Sperrylite in both assemblages contains Ir impurities, while the Pd minerals contain Cu and Ni admixtures, which are typical of mineral assemblages related to the ultramafic intrusions with nickel specialization. PGM were formed under a low sulfur fugacity and high As, Bi, and Sb activities. The postmagmatic fluids affected the primary mineral assemblages under reductive conditions, and this effect resulted in replacement of sperrylite with Ni arsenide (orcelite) and Pt-Fe-Ni and Pt-Fe-Cu alloys; Ni and Cu sulfides were replaced with awaruite and native copper. Pleiades Publishing, Ltd., 2013 Mekhonoshin A. Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1A, 664033, Irkutsk, Russia aut Tolstykh N. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akad. Koptyuga 3, 630090, Novosibirsk, Russia aut Podlipsky M. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akad. Koptyuga 3, 630090, Novosibirsk, Russia aut Kolotilina T. Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1A, 664033, Irkutsk, Russia aut Vishnevsky A. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akad. Koptyuga 3, 630090, Novosibirsk, Russia aut Benedyuk Yu Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1A, 664033, Irkutsk, Russia aut Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/3(2013-05-01), 162-175 1075-7015 55:3<162 2013 55 11477 https://doi.org/10.1134/S1075701513030021 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1075701513030021 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mekhonoshin A. Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1A, 664033, Irkutsk, Russia aut NATIONALLICENCE 700 1- Tolstykh N. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akad. Koptyuga 3, 630090, Novosibirsk, Russia aut NATIONALLICENCE 700 1- Podlipsky M. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akad. Koptyuga 3, 630090, Novosibirsk, Russia aut NATIONALLICENCE 700 1- Kolotilina T. Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1A, 664033, Irkutsk, Russia aut NATIONALLICENCE 700 1- Vishnevsky A. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akad. Koptyuga 3, 630090, Novosibirsk, Russia aut NATIONALLICENCE 700 1- Benedyuk Yu Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1A, 664033, Irkutsk, Russia aut NATIONALLICENCE 773 0- Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/3(2013-05-01), 162-175 1075-7015 55:3<162 2013 55 11477 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer