Uktus Complex


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The 50 sq. km early Cambrian Uktus platinum bearing stock like complex is located on the outskirts of Ekaterinburg ( Yekaterinburg ) in the central Urals of Russia.

Although the Uktus Complex is some 50 km south of the main Uralian Platinum Belt, it belongs to the same Uralian-Alaskan type platinum association.   While the complex appears to have been emplaced in the early Cambrian it underwent slow cooling, equilibration and deformation, followed by low grade metamorphism during the upper Silurian to Devonian.

The main constituents of the complex are dunite, clinopyroxenite, wherlite, olivine and amphibole gabbro, distributed in a concentric zoned structure, with dunite embedded within the wherlite-clinopyroxenite mass which passes outwards into gabbro.   The dunite is variably serpentinised and contains accessory chromite.   Olivine gabbro generally occurs interlayered with clinopyroxenite in the layered central part of the complex, while the amphibole gabbro is found as massive bodies in the central and southern parts of the massif.

The complex contains ubiquitous accessory chromite as euhedral and anhedral crystals, locally forming massive segregations irregularly distributed through the dunite as pods and schlieren about 0.5 to 3 cm thick and 15 to 30 cm long.   The PGE content of the complex is within the dunite cores, associated with the chromitites, with three different PGE populations, which correlate with differing chromitite compositions.

Uktus appears to represent a low grade proto-ore from which significant deposits such as Nizhny Tagil 100 km to the north may have been derived.

For more detail consult the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 2003.    
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.

  References & Additional Information
   Selected References:
Garuti G, Pushkarev E V, Zaccarini F, Cabella R, Anikina E  2003 - Chromite composition and platinum-group mineral assemblage in the Uktus Uralian-Alaskan-type complex (Central Urals, Russia): in    Mineralium Deposita   v38 pp 312-326

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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