Platinoids in the Kaalamo Differentiated Massif in the Northern Ladoga Region, Karelia, Russia
- 16 Downloads
The Kaalamo massif is located in the Northern Ladoga region, Karelia, on the extension of the Kotalahti Belt of Ni-bearing ultramafic intrusions in Finland. The massif, 1.89 Ga in age, is differentiated from pyroxenite to diorite. Nickel–copper sulfide mineralization with platinoids is related to the pyroxenite phase. The ore consists of two mineral types: (i) pentlandite–chalcopyrite–pyrrhotite and (ii) chalcopyrite, both enriched in PGE. Pd and Pt bismuthotellurides, as well as Pd and Pt tellurobismuthides, are represented by the following mineral species: kotulskite, sobolevskite, merenskyite, michenerite, moncheite, keithconnite, telluropalladinite; Pt and Pd sulfides comprise vysotskite, cooperite, braggite, palladium pentlandite, and some other rare phases. High-palladium minerals are contained in pentlandite–chalcopyrite–pyrrhotite ore. Native gold intergrown with kotulskite commonly contains microinclusions (1–3 μm) of Pd stannides: paolovite and atokite. Ore with 20–60% copper sulfides (0.2–6.0% Cu) contains 5.1–6.6 gpt PGE and up to 0.13–2.3 gpt Au. Pd minerals, arsenides and sulfoarsenides of Pt, Rh, Ir, Os, and Ru are identified as well. These are sperrylite, ruthenium platarsite, hollingworthite, and irarsite; silvery gold and paolovite have also been noted. All these minerals have been revealed in the massif for the first time. The paper also presents data on the compositions of 25 PGE minerals (PGM) from Kaalamo ores.
Keywordsplatinum-group minerals (PGM) Kaalamo differentiated massif Northern Ladoga region Karelia
Unable to display preview. Download preview PDF.
- Bogachev, V.A., Ivanikov, V.V., Kozyreva, I.V., et al., Results of the U-Pb zircon dating of 1.89–1.87 Ga synorogenic gabbro–diorite and granitoid intrusions in the Northern Priladozhye. Vestn. St. Petersb. Univ., Ser. 7., 1999, no. 3, pp. 23–33.Google Scholar
- Mineral’no-syr’evaya baza Respubliki Kareliya (Mineral–Raw Base of Karelia), Mihaylov, V.P., and aminov, V.N., Eds., Petrozavodsk: Kareliya, 2005, vol. 1.Google Scholar
- Ivashchenko, V.I., Lavrov, O.B., and Kondrashova, N.I., Ore mineralization of Kaalamo-type minor intrusions in the NW Ladoga region, Geol. Polezn. Iskop. Karelii, 1998, vol. 1, pp. 51–57.Google Scholar
- Ivashenko, V.I., Lavrov, O.B., Kondrashova, N.I. Ore (Ni, Cu, Pt, Pd, Au) potential of the Kaalamo and Velimaki massifs, Northern Ladoga region, in Problemy rudogeneza dokembriiskikh shchitov. Tr. Vseross. Nauchn. Konf. Posvyashchennoi 90 letnemu yubileyu chl. Corr. RAN G.I. Gorbunova (Problems of Ore Genesis of Precambrian Shields. Proceedings of All-Russian Conference Devoted to the 90th anniversary of Corr. Member of RAS G. I. Gorbunov), Apatity, 2008, pp. 98–100 (in Russian).Google Scholar
- Lamberg, P., From genetic concepts to practice-lithogeochemical identification of Ni–Cu mineralized intrusions and localization of the ore, Bull. Geol. Surv. Finl., 2005, vol. 402.Google Scholar
- Lavrov O.B. Noble metal mineralization of the Cu–S ores of the Kaalamo massif, in Mater. Mezhdunar. Conf. Zoloto Fennoskandinavskogo shchita (Proceedings of International Conference “Gold of the Fennoscandian Shield”), Petrozavodsk, 2013, pp. 112–116.Google Scholar
- Makkonen, H.V., 1.9 Ga tholeiitic magmatism and related Ni-Cu deposition in the Juva area, SE Finland, Bull. Geol. Surv. Finl., 1996, vol. 386.Google Scholar
- Mineral Deposits of Europe. Volume 1. Northwest Europe, Bowie, S.H.U., Kvalheim, A., and Haslam, Y.W., London: Inst. Mining Metall. Miner. Soc., 1979.Google Scholar