A new type of Pt–Pd-mineralization in chromitites of the Saranovskoye deposit (Perm Krai)

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Abstract

A new type of Pt-Pd mineralization has been established in the chrome ores of the Main Saranovskoye deposit. The palladium content in the studied chromitites reaches 7.7 ppm, platinum – 0.5 ppm. The minerals are represented by tellurides, arsenides and arsenido-antimonides Pt and Pd – kotulskite, temagamite, atheneite, sperrilite, isomertiite. Chromitites have a specific spotted structure and occur in the form of lenticular separations among the massive medium- and high grade ores of the eastern and western ore bodies of the deposit. As in other stratiform complexes, the formation of Pt-Pd mineralization is associated with the crystallization of residual melt, which penetrated into already crystallized chrome ores. The structural and textural features of chromitites suggest that the localization of platinum-palladium mineralization occurred under the influence of tectonic processes.

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About the authors

P. B. Shiryaev

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

K. S. Ivanov

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

K. A. Dugushkina

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

R. S. Palamarchuk

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

V. N. Puchkov

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com

Corresponding Member of the RAS

Russian Federation, Yekaterinburg

S. Y. Stepanov

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

N. N. Farrakhova

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

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Supplementary files

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2. Fig. 1. Schematic geological map of the +160 m horizon of the Main Saranovskoye chromium ore deposit (built by the authors using data from [8]). Symbols: 1 – undifferentiated ultramafic rocks, 2 – dolerites (gabbro-diabases), 3 – gabbro-anorthosite, 4 – shales, 5 – chromitites (ZRT, CRT, VRT – western, central and eastern ore bodies, respectively), 6 – major fractures, 7 – sampling sites from horizons: a – +160 m, b – +100 m. The inset shows the geological position of the Saranovsky massif (according to [3]). Symbols: 1, 2 – Saratov gabbro-anorthosite-dunite-harzburgite complex: 1 – dunites, dunite-harzburgites, harzburgites; 2 – gabbro, anorthosite, gabbroanartosite; 3 – Vilvenskaya formation: rare-pebble conglomerates, in the middle and upper parts with layers of sericite–quartz and quartzite sandstones shales; 4 - Fedotovskaya formation: carbonaceous-micaceous-quartz and quartzite sandstones shales, in the middle part with layers basalt, in the upper one – lenses of dolomites and calcareous siltstones; 5 – the Usvinsky gabbrodolerite complex; 6 – discontinuous faults: a – major, b – minor; 7 – rivers and their names; 8 – settlements

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3. Fig. 2. Types of ores studied at the Main Saranovskoye deposit. On the left is a photo of the slot in reflected light, on the right is a photo of a polished slice of the sample at scale 1. : 1. Ores: a – densely interspersed, fine-grained, CP–1000/27; b - ovoid (saranovite) CP–1007/9; c - spotted, CP–1000/24; d - poorly interspersed, CP-1005/28. Mineral designations: Ch – chromspinelide, Liz – lizardite, Cal – calcite, Chl – chlorite

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4. Fig. 3. Deformation zone in densely interspersed fine-grained chromium ore CP-1008/8

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5. Fig. 4. EPG distribution in chromium ores of the Main Saranovskoye deposit. The composition of chondrite according to [16]

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6. Fig. 5. Platinum group metal minerals in chromitites of the Main Saranovskoye BSE deposit-images: a–d – sample CP-1012/24; e–i – CP-1000/3. Ktu – kotulskite, Ism – isomerthite, Ah – atheneite, Tem – temagamite, Lrt – laurite, Spy – sperrilite, Mlr – millerite, Cv – covellite, Bn – bornite, Cct – chalcosine, Chr – chromium spinel, Cal – calcite, Chl – chlorite

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