Palaeoproterozoic (2.0–1.95 Ga) pre-orogenic supracrustal sequences in the West Troms Basement Complex, North Norway

Myhre, Per Inge; Corfú, Fernando; Bergh, Steffen G.

doi:10.1016/j.precamres.2011.01.003

Cited by 15 publications

(10 citation statements)

References 31 publications

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“…Palaeoproterozoic rifting and formation of rift basins, similar to that described from the Fennoscandian Shield above, is also documented from the WTBC, including the 2.40 Ga Ringvassøya mafic dyke swarm (Kullerud et al, 2006b) and deposition of supracrustal rocks at 2.40-2.20 Ga (Vanna group; Bergh et al, 2007) and <2.0 Ga (Mjelde-Skorelvvatn and Torsnes belts; Myhre et al, 2011). The last magmatic event to affect the Lofoten-Vesterålen area and WTBC was emplacement of a voluminous AMCG (anorthosite-mangerite/monzonite-charnockite-granite) complex over a rather short time interval at around 1.80 Ga (Corfu, 2004).…”

Section: Figure 1 Fennoscandia and Its Location Within The East Eurosupporting

confidence: 58%

Geology and metallogenic potential of the northwesternmost Norrbotten Province around Altevatn in Troms, northern Norway

Slagstad¹,

Willemoes-Wissing²,

Coint³

et al. 2016

NJG

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Section: Figure 1 Fennoscandia and Its Location Within The East Eurosupporting

confidence: 58%

Geology and metallogenic potential of the northwesternmost Norrbotten Province around Altevatn in Troms, northern Norway

Slagstad¹,

Willemoes-Wissing²,

Coint³

et al. 2016

NJG

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“…It indicates formation of the Tiksheozero alkalic complex near the end of a period of major extension across the Archean cratons of the Fennoscandian Shield but also recorded variously across the Archean nuclei of Laurentia. Events closely in age include extrusion of the Pechenga picritic basalts and the Pilguyarvi layered intrusion in the Pechenga Belt, Kola Peninsula, gabbro and diabase in central Finnish Lapland at Home-Jolhikko, Pittarova, Kulkujärvi, and the MjeldeSkorelvvatn belt in Norway [25][26][27][28]. Although there is some uncertainty about the exact age, it appears that the Kortejärvi and Laivajoki carbonatites [29] farther west in Finland may be coeval to Tiksheozero (2020 Ma, unpublished data by Kouvo, quoted by [12] and references therein).…”

Section: Implications Of the Agementioning

confidence: 99%

U-Pb ID-TIMS age of the Tiksheozero carbonatite: expression of 2.0 Ga alkaline magmatism in Karelia, Russia

et al. 2011

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Abstract:The Tiksheozero carbonatite in northern Russian Karelia is a transitional type between alkaline ultramafic -carbonatitic and alkaline gabbroic suites. The complex is dominated by pyroxenite with a variety of subordinate mafic and ultramafic phases and nepheline syenite. Carbonatite occurs in a main central body and in veins. In this study we have obtained a reliable age for the complex by single grain ID-TIMS U-Pb analyses of zircon and baddeleyite. The age of 1999 ± 5 Ma is important because it places the emplacement of the alkaline complexes in the context of craton-wide extension and break-up events which preceded the initiation of a major Paleoproterozoic orogenic cycle. The Paleoproterozoic age also emphasizes the fact that not all members of the Kola alkaline province are of Paleozoic age.

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“…Furthermore, a maximum depositional age of 1970 Ma was obtained from detrital zircons (Myhre et al, 2011). On this basis, the Torsnes belt is probably not a candidate for correlation with the Målselva Group, at least not for the Myrefjell volcanites (it should be noted that we have no age constraints for the Aurevatn formation).…”

Section: Gold Mineralisationmentioning

confidence: 75%

Geology and gold mineralisation in the Mauken Precambrian basement window, Målselv, Troms, northern Norway

Bjerkgård¹,

Slagstad²,

Henderson³

et al. 2016

NJG

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The Mauken Precambrian basement window in southern Troms is situated approximately midway between the West Troms Basement Complex (WTBC) and Altevatn-Dividalen basement areas. Work in the Mauken window is part of a NGU project focusing on the basement areas with the main goal to work out a structural-tectonic-metallogenic model and interpretation for the whole region. The window comprises a central unit of metavolcanic and metasedimentary rocks -the Målselva Group, bounded by mainly felsic intrusive rocks to the west,.the Andsfjell-Kampen intrusions, and a very diverse suite of intrusive rocks in the east,.the Øverbygd intrusions. Ages obtained (U-Pb on zircons) on the intrusions range from Neoarchaean to Palaeoproterozoic (2836-1892 Ma). Geochemistry of the greenstone unit in the Myrefjell formation of the Målselva Group indicates an arc/back-arc affinity. The upper part of the Målselva Group, the Aurevatn formation, consists of clastic sedimentary rocks such as siltstone and sandstone, partly forming turbiditic units. On this basis, the Målselva Group must have been formed close to a continent. A granodiorite intruding the greenstone was dated to 2108 Ma, meaning that the lower part of the Målselva Group is Palaeoproterozoic or older in age. Regional magnetic data indicate that the most likely continuation of the Mauken window under the Caledonian nappes is to the area between Senja and Kvaløya of the WTBC, and the Astridal and Torsnes belts of supracrustal rocks. The only significant gold mineralisation found in the Mauken window is the so-called 'Main Zone', which is localised in a sand-/siltstone unit close to the contact to underlying greenstone. Gold is associated with and strongly correlated with arsenic. One possible source of the gold and arsenic in this setting is carbonaceous sediments, which are known to concentrate different metals in early formed, diagenetic iron sulphides. A possible formation model for the deposit is that gold, arsenic and sulphur were released from the diagenetic sulphides because of recrystallisation during metamorphism, and that the resulting fluids followed structural pathways, e.g., along or close to the greenstone-sediment contact, and deposited the metals higher up in the sequence. With the size and gold grades of the mineralised zone known today, the mineralisation is not economic. In the RombakTectonic Window of northern Nordland there are some Au-As mineralisations which are associated with metagreywacke and metasiltstone. Those mineralisations have been suggested to be of orogenic type, related to shear zones and structures formed during the Palaeoproterozoic, but they also show many similarities with the Mauken mineralisation, suggesting that these too could have formed in the same way.

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Palaeoproterozoic (2.0–1.95 Ga) pre-orogenic supracrustal sequences in the West Troms Basement Complex, North Norway

Cited by 15 publications

References 31 publications

Geology and metallogenic potential of the northwesternmost Norrbotten Province around Altevatn in Troms, northern Norway

Geology and metallogenic potential of the northwesternmost Norrbotten Province around Altevatn in Troms, northern Norway

U-Pb ID-TIMS age of the Tiksheozero carbonatite: expression of 2.0 Ga alkaline magmatism in Karelia, Russia

Geology and gold mineralisation in the Mauken Precambrian basement window, Målselv, Troms, northern Norway

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