Quantitative mineral resource assessment of undiscovered PGE resources in Finland

Rasilainen, K.; Eilu, Pasi; Halkoaho, Tapio; Iljina, M.; Karinen, Tuomo

doi:10.1016/j.oregeorev.2010.05.001

Cited by 23 publications

(11 citation statements)

References 13 publications

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“…Most of these zircons have a low discordance ( Table 1).Three of them (7,9,10) have a discordance close to zeroand plot on the concordia with a calculated age of 2509 ± 10 Ma (including decay constant errors; MSWD = 0.42; concordance probability is 0.52). Three relatively discordant zircon grains of this group (1,2,5) together with concordant zircons form a discordia, which includes the ID-TIMS multi-grain zircon analysis P6-3 (Figure 7). This data point was taken from a previous study and represents a zircon from the same lithology [13].…”

Section: Results Of Zircon Imaging and U-pb Shrimp Datingmentioning

confidence: 99%

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

Groshev

Karykowski²

2019

Minerals

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The West-Pana intrusion belongs to the Paleoproterozoic Fedorova-Pana Complex of the Kola Region in NW Russia, which represents one of Europe's most significant layered complexes in terms of total platinum group element (PGE) endowment. Numerous studies on the age of the West-Pana intrusion have been carried out in the past; however, all published U-Pb isotope ages were determined using multi-grain ID-TIMS. In this study, the mineralized Main Anorthosite Layer from the upper portion of the intrusion was dated using SHRIMP-II for the first time. High Th/U (0.9-3.7) zircons gave an upper intercept age of 2509.4 ± 6.2 Ma (2σ), whereas the lower portion of the intrusion was previously dated at 2501.5 ± 1.7 Ma, which suggests an out-of-sequence emplacement of the West-Pana intrusion. Furthermore, high-grade PGE mineralization hosted by the anorthosite layer, known as "South Reef", can be attributed to (1) downward percolation of PGE-enriched sulfide liquid from the overlying gabbronoritic magma or (2) secondary redistribution of PGEs, which may coincide with a post-magmatic alteration event recorded by low Th/U (0.1-0.9) zircon and baddeleyite at 2476 ± 13 Ma (upper intercept).

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Section: Results Of Zircon Imaging and U-pb Shrimp Datingmentioning

confidence: 99%

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

Groshev

Karykowski²

2019

Minerals

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“…Table 10. The main stages of formation of gold and gold-bearing deposits and occurrences in the northeastern part of the Fennoscandian Shield (based on data from References [8,32,52] The main prospects of the Kola region for new gold deposits are connected with the three abovementioned regional sutures. We can define four areas which have potential to become real goldfields in the case of successful exploration: the northwestern part of the Kolmozero-Voron'ya belt, the South Pechenga structure, the Strel'na belt at the northern flank of the Srel'na terrane, and the eastern flank of the Salla-Koulajarvi belt (Figures 1 and 2).…”

Section: Distribution and Timing Of Formation Of Gold Deposits In Thementioning

confidence: 99%

Gold Prospects in the Western Segment of the Russian Arctic: Regional Metallogeny and Distribution of Mineralization

et al. 2019

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Location of the deposits and occurrences of gold mineralization in metamorphic complexes of the Kola region is controlled by tectonic zones at the regional scale at the boundaries of major segments of the Fennoscandian Shield. Three zones are the most important: (1) the system of Neoarchean greenstone belts Kolmozero–Voron’ya–Ura-guba along the southern boundary of the Murmansk craton; (2) the suture, delineating the core of the Lapland–Kola orogeny in the north; and (3) the series of overthrusts and faults at the eastern flank of the Salla–Kuolajarvi belt. Gold deposits and occurrences are located within greenstone belts of Neoarchean and Paleoproterozoic age, and hosted by rocks of different primary compositions (mafic metavolcanics, diorite porphyry, and metasedimentary terrigenous rocks). The grade of metamorphism varies from greenschist to upper amphibolite facies, but the mineralized rocks are mainly lower amphibolite metamorphosed, close to the transition from greenschist to amphibolite facies. Gold deposits and occurrences in the northeastern part of the Fennoscandian Shield formed during two periods: the Neoarchean 2.7–2.6 Ga and the Paleoproterozoic 1.9–1.7 Ga. According to paleo-geodynamic reconstructions, these were the periods of collisional and accretionary orogeny in the region. Those Archean greenstone belts, which were reworked in the Paleoproterozoic (e.g., Strel’na and Tiksheozero belts), can contain gold deposits of Paleoproterozoic age.

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“…One of the most remarkable Fennoscandian intrusions in terms of PGE mineralization is the 2.5 Ga Fedorova-Pana Complex, as it hosts the largest volume of PGE resources in Europe, exceeding 400 tons in total [34]. These are hosted by internal PGE reefs associated with interlayered pyroxenite, gabbronorite and anorthosite, and Cu-Ni-PGE mineralization at the basal contact of the intrusion [22].…”

Section: Geologic Settingmentioning

confidence: 99%

Low-Sulfide Platinum–Palladium Deposits of the Paleoproterozoic Fedorova–Pana Layered Complex, Kola Region, Russia

Groshev

Rundkvist

Karykowski³

et al. 2019

Minerals

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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.

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Quantitative mineral resource assessment of undiscovered PGE resources in Finland

Cited by 23 publications

References 13 publications

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

Gold Prospects in the Western Segment of the Russian Arctic: Regional Metallogeny and Distribution of Mineralization

Low-Sulfide Platinum–Palladium Deposits of the Paleoproterozoic Fedorova–Pana Layered Complex, Kola Region, Russia

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