Gold deposits in northern Finland - Arkisto.gsf.fi

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25°E 30°E Bjørnevatn Fe NORWAY Bidjovagge Au-Cu Pechenga Ni 69°N RUSSIA Saattopora Au-Cu Suurikuusikko Au Koitelainen Cr-V Sokli P(Nb) Hannukainen Fe Kittilä Pahtavaara Au Kevitsa Ni-Cu-PGE Sakatti Ni-Cu Tapuli Fe Sodankylä Akanvaara Cr-V SWEDEN FINLAND Rovaniemi Konttijärvi PGE Siika-Kämä PGE Juomasuo Au-Co 66°N Ahmavaara PGE 0 50 km Kemi Cr Mustavaara V Figure 2. Metallogenic belts and major metallic mineral deposits of northern Finland and surroundings (Eilu et al. 2009, FODD 2013). Legend on the facing page. 10 Pasi Eilu & Tero Niiranen (ed.)
Metallogenic Areas and Mineral Deposits Base metals: Co, Cu, Pb, Zn Base metals: Ni Ferrous metals: Cr, Fe, Mn, Ti, V Precious metals: Ag, Au PGE: Pd, Pt, Rh Special metals: Be, Li, Mo, Nb, REE, Sc, Sn, Ta, W, Zr Energy metals: U, Th Deposit size Small, Showing Potentially large, Medium Very large, Large Neoproterozoic (and possibly Mesoproterozoic) and Phanerozoic rocks outside the Caledonian orogenic belt Vendian to Cambrian and Devonian alkaline igneous rocks Upper Riphean (and possibly older) Vendian and Phanerozoic sedimentary rocks Caledonian orogenic belt Neoproterozoic and Palaeozoic (Cambrian to Devonian) rocks along the shortened Baltoscandian continental margin Proterozoic rocks (c. 2.30–0.90 Ga) along the shortened Baltoscandian continental margin Palaeoproterozoic rocks (2.50–1.75 Ga) Volcanic rocks (c. 1.96–1.75 Ga) Supracrustal rocks, predominantly sedimentary rocks (1.96–1.75 Ga) Intrusive rocks, predominantly granitoids (1.96–1.75 Ga) Supracrustal rocks, predominantly mafic to ultramafic volcanic rocks and sedimentary rocks (2.50–1.96 Ga) Intrusive rocks, predominantly mafic and ultramafic (2.50–1.96 Ga) Archaean rocks Intrusive rocks, orthogneiss, migmatitic gneiss (c. 3.20–2.50 Ga and possibly older) Supracrustal rocks (c. 3.20–2.75 Ga and possibly older) sequent collisional stacking at 2.73–2.68 Ga is the proposed model for the amalgamation of the Karelia Province (Hölttä et al. 2012). The Belomorian province (Fig. 1) is dominated by 2.9–2.7 Ga granitoids and includes volcanic rocks formed at 2.88–2.82 Ga, 2.8–2.78 Ga and 2.75–2.66 Ga. The Neoarchaean ophiolitelike rocks and 2.7 Ga eclogites in the Belomorian province are possible examples of Phanerozoic-style subduction and collision (Hölttä et al. 2008). The Kola province (combined Kola and Murmansk provinces of Hölttä et al. 2008) is a mosaic of Mesoarchaean and Neoarchaean units, together with some Palaeoproterozoic components. The Archaean part of the Norrbotten province is mainly concealed under cover rocks, and very limited data are available (Mellqvist et al. 1999, Bergman et al. 2001). Rifting of the Archaean continent or continents began in north-eastern Fennoscandia and became widespread after the emplacement of 2.50–2.44 Ga, plume-related, layered gabbro-norite intrusions and dyke swarms (Iljina & Hanski 2005). Erosion and deep weathering after 2.44 Ga was followed by glaciation, and later deep chemical weathering again covered large areas in the Karelian province at c. 2.35 Ga (Laajoki 2005, Melezhik 2006). Rifting events at 2.4–2.1 Ga are associated with mostly tholeiitic mafic dykes and sills, sporadic volcanism and typically fluvial to shallow-water sedimentary rocks (Laajoki 2005, Vuollo & Huhma 2005). Local shallow marine environments were marked by deposition of carbonates, and possibly evaporites, at 2.2–2.1 Ga, showing a large positive δ 13 C isotope anomaly during the Lomagundi–Jatuli Event (Karhu 2005, Melezhik et al. 2007, Kyläkoski et al. 2012a). Along the present western edge of the Karelian province, 2.05 Ga bimodal felsic-mafic volcanic rocks of alkaline affinity are intercalated with deep-water turbiditic sedimentary rocks. Excursion Guidebook FIN1 11
Page 1 and 2: 12th Biennial SGA Meeting 12-15 Aug
Page 3: Excursion Guidebook FIN1 Gold depos
Page 7 and 8: Contents Programme ................
Page 9 and 10: Saattopora Levi Suurikuusikko (Kitt
Page 11: Timanide orogen 500 km Murmansk Lap
Page 15 and 16: 24°0'0"E 26°0'0"E 68°0'0"N Suuri
Page 17 and 18: 24°0'0"E 25°0'0"E 26°0'0"E N Rom
Page 19 and 20: Table 2. Selected, potentially sign
Page 21 and 22: stone Belt (CLGB). The CLGC is geol
Page 23 and 24: schist to upper amphibolite facies.
Page 25 and 26: of Ag, Au, As, CO 2 , K, Rb, S, Sb
Page 27 and 28: 3472000 3476000 3480000 3484000 750
Page 29 and 30: 30% decrease in net volume. Amphibo
Page 31 and 32: 7525300 A’ 3391900 3390500 A 200
Page 33 and 34: eralisation took place at 300-350
Page 35 and 36: comm. 2002). Ore-grade rock was fou
Page 37 and 38: Figure 18. Loading ore. Underground
Page 39 and 40: from progressive alteration of mafi
Page 41 and 42: least 25 km (Fig. 15). The dip of t
Page 43 and 44: Table 4. Alteration minerals presen
Page 45 and 46: tober 15, 2012 (Fig. 28). The prese
Page 47 and 48: 3 395 000 mE 3 400 000 mE 3 405 000
Page 49 and 50: ciated with the gold and uraninite.
Page 51 and 52: Table 6. North Rompas drilling inte
Page 53 and 54: Grönholm, P., 1999: The mesotherma
Page 55 and 56: J.S., Siedlecka, A. & Solli, A., 19
Page 57: Sorjonen-Ward, P., Ojala, V.J. & Ai

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