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

Abstract

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).

Platinum Group Elements in Geosphere and Anthroposphere: Interplay among the Global Reserves, Urban Ores, Markets and Circular Economy

“…Another class of large magmatic deposits consists of Ni sulfides in ultramafic komatiites which also often contain PGEs [19][20][21][22]. For example, numerous intrusions containing the deposits of PGEs together with Cu and Ni are located in Russia at the Norilsk ore region [23][24][25][26]. Implications of ore-forming processes as well as magmatic evolution aspects are given in the literature [27,28].…”

Apatite as an Indicator for the Formation of PGE Mineralization as Exemplified by Anorthosites of the Kievey Deposit, Fedorova-Pana Layered Complex, Kola Peninsula, Russia

“…The first and fourth OMS are relatively unstudied and have Pd/Pt = 8-12 and Pd/Pt < 1, respectively. The former probably has the oldest U-Pb age of zircon in the Fedorova-Pana Complex, equal to 2509.4 ± 6.2 Ma [44].…”

The Sulfide/Silicate Coefficients of Nd and Sm: Geochemical “Fingerprints” for the Syn- and Epigenetic Cu-Ni-(PGE) Ores in the NE Fennoscandian Shield

“…In the northeastern Baltic Shield (Figure 1), large-scale mafic-ultramafic deposits of Cu-Ni-Co, platinum group elements (PGE), and Fe-Ti-V are economically significant, in particular, concerning critical raw materials, such as PGE and V. These are major Cu-Ni-Co-Cr+PGE deposits in the Monchegorsk ore area [36][37][38][39] and Pechenga [40][41][42], Fe-Ti-V Kolvitsa deposit [43,44], PGE+Cu-Ni Fedorovo-Pansky layered complex [2,4,45,46], and Burakovsky intrusion [47], Cu-Ni-Co+PGE deposits in Finland: Kemi [39,48], Penikat [49], Portimo (Ahmavaara intrusion) [50,51], Akanvaara, Koitelainen [52], Tornio [51], etc.…”