Archean–Proterozoic collision boundary in central Fennoscandia: Revisited

Lahtinen, Raimo; Huhma, Hannu; Lahaye, Yann; Kousa, Jukka; Luukas, Jouni

doi:10.1016/j.precamres.2015.02.012

Cited by 30 publications

(19 citation statements)

References 60 publications

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“…Both tholeiitic and alkaline non-contaminated basalts have ε Nd (2.06 Ga) values of ca. +2 and contaminated variants show ε Nd (2.06 Ga) values down to −3.1 (Lukkarinen, 2008;Lahtinen et al, 2015c) which are comparable to those analyzed for Väystäjä (Fig. 6, Table 1).…”

Section: Mafic Volcanic Rockssupporting

confidence: 69%

“…13 and 14). The ε Nd (2.06 Ga) value of -0.8 from the upper Kirjoniemi felsic tuff (Lukkarinen, 2008;Lahtinen et al, 2015c) is comparable with sample A643 from Väystäjä ( Fig. 6 and Table 1).…”

Section: Felsic Magmatismsupporting

confidence: 55%

“…N-MORB, E-MORB, and OIB from Sun and McDonough (1989). Siilinjärvi basalt field after Lahtinen et al (2015c). b.…”

Section: Felsic Magmatismmentioning

confidence: 99%

“…WPG = within-plate granite; syn-COLG = syncollisional granite; VAG = volcanic arc granite; ORG = oceanic ridge granite. Upper and lower refer to the Siilinjärvi Kirjoniemi tuffs (Lukkarinen, 2008;Lahtinen et al, 2015c).…”

Section: Felsic Magmatismmentioning

confidence: 99%

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Geochemical and U-Pb and Sm-Nd isotopic constraints on the evolution of the Paleoproterozoic Ylitornio nappe complex, northern Fennoscandia

Lahtinen¹,

Huhma²,

Lauri³

et al. 2019

Bull Geol Soc Finland

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The Ylitornio area in northern Finland is a typical example of a poorly outcropping, multiply deformed, complex Precambrian terrain. U-Pb, Sm-Nd and geochemical data from metavolcanic, metasedimentary and plutonic rocks combined with structural data define the lithodemic units and tectonostratigraphy of the area. The Mellajoki, Martimo, Hosiojoki, Kierovaara and Uusivirka suites form the Ylitornio nappe complex. Although main thrust stacking had occurred between 1.92-1.89 Ga, later reverse faulting probably continued until 1.78 Ga. The Väystäjä bimodal volcanic rocks (2.09-2.05 Ga) from the Martimo suite are plume-related EMORB-OIB rocks formed during a continent breakup. The Kaskimaa greywacke of the Martimo suite is inferred to represent sedimentation in a deepening rift basin in the continental margin. The coeval Hosiojoki felsic rocks with A-type affinity and the Kierovaara suite granites (2.00-1.98 Ga) represent dry melting of a dominantly 2.1-2.05 Ga contaminated mafic underplate, and hydrous melting of both the mafic underplate and a refractory lower crust of Archean age, respectively. The older rocks of the Uusivirka suite are early-collisional (1.92-1.91 Ga) and derived from poorly mixed local sources, whereas younger psammite-pelite associations (Ristivuoma) are syn-collisional (1.91-1.89 Ga) and derive from multiply recycled and thoroughly mixed sources. These rocks were deformed during continued collision with the development of foreland fold-and thrust belt.

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Section: Mafic Volcanic Rockssupporting

confidence: 69%

Section: Felsic Magmatismsupporting

confidence: 55%

“…N-MORB, E-MORB, and OIB from Sun and McDonough (1989). Siilinjärvi basalt field after Lahtinen et al (2015c). b.…”

Section: Felsic Magmatismmentioning

confidence: 99%

Section: Felsic Magmatismmentioning

confidence: 99%

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Geochemical and U-Pb and Sm-Nd isotopic constraints on the evolution of the Paleoproterozoic Ylitornio nappe complex, northern Fennoscandia

Lahtinen¹,

Huhma²,

Lauri³

et al. 2019

Bull Geol Soc Finland

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“…9A, B). Rare-earth (Balashov et al, 1993(Balashov et al, ), c. 2450 Ma plutons from the Belomorian Craton (Lobach-Zhuchenko et al, 1998), c. 2450-2428 Ma plutons from the Karelian Craton (Huhma et al, 1990;Amelin & Semenov, 1996;Perttunen & Vaasjoki, 2001;Hanski et al, 2001bHanski et al, ), c. 2450Hanski et al, -2410 Ma volcanic rocks from Vetreny Belt (Puchtel et al, 1996(Puchtel et al, , 1997(Puchtel et al, ), c. 2440 Onkamo Group volcanic rocks (Hanski & Huhma, 2005), c. 2403 Ma Ringvassøy dykes (Kullerud et al, 2006(Kullerud et al, ), c. 2504(Kullerud et al, , 2450(Kullerud et al, , 2310(Kullerud et al, and 2140 Ma dykes in the Karelian Craton (Amelin & Semenov, 1996;Mertanen et al, 2006;Stepanova et al, 2014Stepanova et al, , 2015, c. 2330 Ma Runkaus volcanic rocks in Peräpohja Schist Belt (Huhma et al, 1990), c. 2220 Ma Haaskalehto-type sills and dykes (Huhma et al, 1990;Hanski et al, 2010), 2137 ± 5 Ma amphibolite of Čáskejas Formation (deep pink; Krill et al, 1985) and davidite of the Bidjovagge deposit (pale pink; Bjørlykke et al, 1990) in the Kautokeino Greenstone Belt, c. 2090 Ma Jouttiaapa volcanic rocks in Peräpohja Schist Belt (Huhma et al, 1990(Huhma et al, ), c. 2085 Ma komatiites in the Karasjok Greenstone Belt (Henriksen, 1983;Krill et al, 1985), c. 2060 Ma Siilinjärvi volcanic rocks (Lahtinen et al, 2015b), c. 2060Ma Jeesiörova and Peuramaa komatiites in Savukoski Group in Central Lapland Greenstone Belt (Hanski et a...…”

Section: Goldenvárri Formation Lithostratigraphymentioning

confidence: 99%

Geochronology of the Palaeoproterozoic Kautokeino Greenstone Belt, Finnmark, Norway: Tectonic implications in a Fennoscandia context

Bingen¹,

Solli²,

Viola³

et al. 2016

NJG

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Silver isotope analysis and systematics of native gold from the Rajapalot Co-enriched gold deposit, Finnish Lapland

Tepsell,

Lahaye,

Molnár

et al. 2023

Miner Deposita

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Silver is probably the closest isotopic proxy to track monoisotopic gold and has been shown to have great potential to yield new information on the origin and enrichment processes of gold. This study describes the development of a tailored analytical protocol for accurate analysis of Ag isotopes and provides the first Ag isotope data for the Paleoproterozoic Rajapalot Au-Co deposit, Finnish Lapland. Six native Au samples yield ε109Ag values (relative to NIST SRM 978a) from −6.8 to +2.1 and are within the range of Ag isotopic compositions reported for native Au samples. The mean of the analyzed Au samples is ε109Ag = −3.8 ± 1.7 (2SD) with most of the samples with negative ε109Ag values (−6.7 to −2.0); one sample has a positive ε109Ag value of +2.1 ± 0.5. Silver isotope fractionation in the Rajapalot Au deposit was likely associated with physicochemical processes related to deposition and/or re-mobilization of the ore rather than with source region inheritance. It is suggested that redox reactions involving Ag+ ↔ Ag0 phase change primarily account for the isotopic differences within the deposit. Our results also suggest that the Rajapalot Au-Co deposit was formed via multistage ore-forming processes and/or that the primary ore was re-mobilized, which caused isotope fractionation along fluid pathways. Silver isotope variation within a deposit may mark a fractional crystallization trend with the lightest isotopic composition representing the earliest precipitate. Hence, Ag isotopes show potential as an isotopic vectoring tool in search of Au-enriched domains.

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Archean–Proterozoic collision boundary in central Fennoscandia: Revisited

Cited by 30 publications

References 60 publications

Geochemical and U-Pb and Sm-Nd isotopic constraints on the evolution of the Paleoproterozoic Ylitornio nappe complex, northern Fennoscandia

Geochemical and U-Pb and Sm-Nd isotopic constraints on the evolution of the Paleoproterozoic Ylitornio nappe complex, northern Fennoscandia

Geochronology of the Palaeoproterozoic Kautokeino Greenstone Belt, Finnmark, Norway: Tectonic implications in a Fennoscandia context

Silver isotope analysis and systematics of native gold from the Rajapalot Co-enriched gold deposit, Finnish Lapland

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