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Salavat |
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Russia |
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Cu Mo
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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Salavat is located in the Ural Mountains near Magnitogorsk in Russia.
It is one of a number of medium sized, relatively low grade (0.5% Cu, 0.002 to 0.003% Mo) Devono-Carboniferous porphyry Cu-Mo deposits in the Uralian Fold Belt developed in association with metallogenic districts which contain massive sulphide deposits. These porphyry deposits are characterised by stockwork and disseminated mineralisation and are related to the cupolas of minor porphyry intrusives, mainly those of the gabbro-diorite series in which the Na:K ratio is 3:1.
The mineralised porphyry intrusives, comprising gabbro-diorite-quartz diorite association rocks, predominantly quartz diorite, are intruded into belts of volcanics which range from basalt to andesite-basalt and less commonly to andesite-dacite and dacite.
Salavat, one of the largest porphyry style deposit in the Uralian Fold Belt, is a typical example, occuring in the Magnitogorsk Synclinorium within the central core of the Urals, near and the Gaya and Sibay massive sulphide Cu-Zn deposits (Zvezdov, et al., 1993).
Mineralisation at Salavat is associated with a diorite porphyry intruding a sequence of tuffs and lavas of pyroxene-plagioclase andesite-basalt, with interlayers of tuffaceous siltstone and tuffaceous sandstone. The mineralised intrusive is a plagioclase and hornblende-plagioclase diorite porphyry, cut by dykes of quartz-hornblende-plagioclase diorite, rhyolite-dacite porphyry and basalt porphyry. Mineralisation is confined to the central part of the diorite-porphyry stock, with the distribution being controlled by the shape of the mineralised intrusion. The mineralisation has the form of a steeply dipping curved sheet which is crescent shaped in plan, pinching outon both extremities.
The diorite porphyry and related dykes, and the intruded upper volcanics are altered and contain, in decreasing order of abundance: quartz, chlorite, albite, pumpellyite, carbonate, clinozoisite, sericite, anhydrite and gypsum. The bulk of the altered rocks are chlorite-quartz varieties with nest like accumulations of the other minerals. The principal metal sulphides are pyrite and chalcopyrite. Molybdenite, pyrrhotite, rutile, tennantite, sphalerite, galena, magnetite, ilmenite and bornite are rare. Mineralisation is largely present as disseminations associated with the dark minerals of the diorite porphyry. Ore veinlets are less common (Zvezdov,et al., 1993).
An inferred resources of ~800 Mt @ 0.4% Cu, and up to 0.07% Mo has been quoted by Plotinskaya, et al. (2017).
The most recent source geological information used to prepare this decription was dated: 1996.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Plotinskaya, O.Yu., Grabezhev, A.I., Tessalina, S., Seltmann, R., Groznova, E.O. and Abramov, S.S., 2017 - Porphyry deposits of the Urals: Geological framework and metallogeny: in Ore Geology Reviews v.85, pp. 153-173.
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Zvezdov V S, Migachev I F and Girfanov M M 1993 - Porphyry copper deposits of the CIS and the models of their formation: in Ore Geology Reviews v7 pp 511-549
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