Several deposits of low-sulfide Pt–Pd ores have been discovered in recent decades in the Paleoproterozoic Fedorova–Pana Layered Complex located in the Kola Region (Murmansk Oblast) of Russia. The deposits are divided into two types: reef-style, associated with the layered central portions of intrusions, and contact-style, localized in the lower parts of intrusions near the contact with the Archean basement. The Kievey and the North Kamennik deposits represent the first ore type and are confined to the North PGE Reef located 600–800 m above the base of the West Pana Intrusion. The reef is associated with a horizon of cyclically interlayered orthopyroxenite, gabbronorite and anorthosite. The average contents of Au, Pt and Pd in the Kievey ore are 0.15, 0.53 and 3.32 ppm, respectively. The North Kamennik deposit has similar contents of noble metals. The Fedorova Tundra deposit belongs to the second ore type and has been explored in two sites in the lower part of the Fedorova intrusion. Mineralization is mainly associated mainly with taxitic or varied-textured gabbronorites, forming a matrix of intrusive breccia with fragments of barren orthopyroxenite. The ores contain an average of 0.08 ppm Au, 0.29 ppm Pt and 1.20 ppm Pd. In terms of PGE resources, the Fedorova Tundra is the largest deposit in Europe, hosting more than 300 tons of noble metals.
Pd-ìåñòîðîaeäåíèå Ñåâåðíûé Êàìåííèê ïðèóðî÷åíî ê Ñåâåðíîìó ïëàòèíîíîñíîìó ðèôó, çàëåãàþùåìó â 800 ì îò ïîäîøâû Çàïàäíî-Ïàíñêîãî ìàññèâà ïàëåîïðîòåðîçîéñêîãî ôåäîðîâî-ïàíñêîãî ðàññëîåííîãî êîìïëåêñà Êîëüñêîãî ïîëóîñòðîâà. Îñíîâíîå ðóäíîå òåëî ýòîãî ìåñòîðîaeäåíèÿ ñîïðîâîaeäàåòñÿ íèaeåëåaeàùèìè ðóäíûìè òåëàìè, ÷òî íåòèïè÷íî äëÿ äðóãèõ ó÷àñòêîâ Ñåâåðíîãî ðèôà (ìåñòîðîaeäåíèå Êèåâåé). Íèaeíèå ðóäíûå òåëà, îòëè-÷àÿñü îò îñíîâíîãî ïî ñîñòàâó âìåùàþùèõ ïîðîä è ãåîõèìè÷åñêèì õàðàêòåðèñòèêàì, ðàçäåëÿþòñÿ íà òðè òèïà. Ïðîâåäåííûå ìèíåðàëîãè÷åñêèå èññëåäîâàíèÿ ïîçâîëÿþò îïðåäåëèòü êàaeäûé èç òèïîâ ïî àññîöèàöèè ìèíåðàëîâ ïëàòèíîâîé ãðóïïû-ñòàííèäíî-òåëëóðèäíîé (òèï 1), àðñåíèäíî-ñóëüôèäíî-òåëëóðèäíîé (òèï 2) è ñóëüôèäíî-òåëëóðèäíîé (òèï 3). Ïðè èçó÷åíèè ñòàííèäíî-òåëëóðèäíîé è àðñåíèäíî-ñóëüôèäíî-òåëëóðèäíîé àññîöèàöèé áûëî óñòàíîâëåíî òðè íîâûõ äëÿ Ñåâåðíîãî ðèôà ìèíåðàëà: àðñåíîïàëëàäèíèò, èçîìåðòèèò è êîéîíåíèò.
The paper summarizes the present time available data on plagioclase composition through PGE reef sequences in the West-Pana intrusion, Kola Peninsula, NW Russia. The intrusion hosts two PGE-enriched levels with a strongly different economic potential. A lower level is known as “North Reef” and contains several deposits of low-sulfide Pt-Pd ores discovered in past decades whereas an upper “South Reef” level showing high-grade mineralization in some places does not have ore bodies. Comparing the variations of anorthite content in plagioclase through the North Reef with sharp changes from An63 in the underlying unit to An86 in the reef sequence with those in the South Reef (An75 with no significant changes) it is suggested that the formation of the former directly corresponds with an early-magmatic process while the latter has a distinct late-magmatic genesis. Thus plagioclase can be considered as an indicator of the economic potential of PGE reef within the West-Pana intrusion and probably in other layered intrusions when it is necessary to choose the most promising mineralized level in the stratigraphy.
The low-sulfide palladium deposit North Kamennik is confined to the North platinum-bearing reef in the West Pana intrusion of the Paleoproterozoic Fedorova-Pana layered complex of the Kola Peninsula. The main ore body of this deposit is accompanied by underlying ore bodies, which is not typical of other sites of the North Reef (e.g., Kievey deposit). The lower ore bodies, differing from the main one in composition of the host rocks and geochemical characteristics, are divided into three types. The conducted mineralogical studies allow us to determine each ore type according to the PGM assemblage — stannide-telluride (type 1), arsenide-sulfide-telluride (type 2) and sulfide-telluride (type 3). Mineralogical finds have been made within the ore bodies of stannide-telluride and arsenide-sulfide-telluride PGM assemblages and are presented by arsenopalladinite, isomertieite and kojonenite (new minerals for the North Reef).
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