The depositional evolution of the Svecofennian supracrustal sequence in Finland and Sweden

Welin, Eric

doi:10.1016/0301-9268(87)90047-7

Cited by 127 publications

(42 citation statements)

References 29 publications

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“…Not even from the now reasonably well-dated Kristineberg area is it possible to satisfactorily determine the temporal relationship between all the intrusive phases and the structurally overlying volcanic sequence. The regionally overlapping ages of the early-orogenic intrusives (Wilson et al, 1987;Weihed and Schönberg, 1991;Lundström et al, 1997;Weihed et al, 2002;Gonzàles Roldán, 2010) and the Skellefte Group metavolcanic rocks (Welin, 1987;Billström and Weihed, 1996) are in agreement with the idea that the Viterliden complex intruded into the succession of the Skellefte Group metavolcanic rocks (Galley and Bailes, 1999). This is also supported by the xenoliths of altered ore-hosting metavolcanic rocks in the "mine porphyry" at Kristineberg (Årebäck et al, 2005).…”

Section: Discussionsupporting

confidence: 66%

“…The 1.89-1.88 Ga age for the Kristineberg hangingwall rhyolite shows that not only intrusive, but also felsic volcanic activity was synchronous throughout the whole Skellefte District, culminating at around 1.89 Ga (cf. Welin, 1987;Billström and Weihed, 1996). This also supports the idea that the Skellefte District was originally a laterally (sub)continuous volcanic belt (Carranza and Sadeghi, 2010) that was later split and transposed by tectonic events .…”

Section: Discussionmentioning

confidence: 99%

“…It is the main host to the VMS deposits, the majority of which are located within the upper part of the unit (Allen et al, 1996). Age of the Skellefte Group volcanism has been dated at ∼1.89-1.88 Ga by U-Pb data on zircons from the central part of the Skellefte District (Welin, 1987;Billström and Weihed, 1996;Montelius, 2005). The dominantly metasedimentary Vargfors Group (1875 ± 4 Ma; Billström and lies stratigraphically above the Skellefte Group rocks and is coeval with deposition of the sub-aerial Arvidsjaur Group occurring further to the north (Skiöld et al, 1993).…”

Section: Lithologymentioning

confidence: 99%

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New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield

et al. 2011

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Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Lithologymentioning

confidence: 99%

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New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield

et al. 2011

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“…U/Pb determinations have given ages of 1.88-1.91Ga (Ski61d and Cliff 1984;Ski61d 1987;Welin 1987). The volcanism was connected with a differentiated plutonism, 1.86-1.89 Ga old, and later affected by a granitic plutonism, 1.77-1.80 Ga old (Ski61d 1987).…”

Section: Geological Setting Of the Lower Proterozoic Sulphide-bearingmentioning

confidence: 97%

Sulphur isotopes in Lower Proterozoic iron and sulphide ores in northern Sweden

1995

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Abstract. The present investigation deals with sulphur isotope distribution in Lower Proterozoic iron and sulphide mineralizations in northern Sweden. The contrastmg sulphur isotope patterns are indicative of different genesis. Some 267 sulphur isotope analyses of pyrite, pyrrhotite, chalcopyrite, sphalerite, galena and bornite from 23 occurrences have been performed. Some deposits exhibit uniform compositions, although the mean 634S values are clearly different, while other mineralizations have widely fluctuating values.The 634S values in syngenetic, exhalative sedimentary skarn iron ores, quartz-banded iron ores and sulphide mineralizations of the 2.0-2.5 Ga old (Lapponian) Greenstone group show a large spread, supporting the existence of bacteriogenic sulphate reduction processes. The spread of the sulphur isotope values (&34S = -8 to + 25%o), and the non-equilibrium conditions, point to a biogenic rather than to an inorganic reduction of seawater sulphate.The isotopic composition of the sulphides in the epigenetic Lannavaara iron ores which were formed by a hydrothermal scapolite-tourmaline-related process, indicates a sulphur source similar to that of the Greenstone group. The &34S values of Cu-(Au) sulphide mineralizations in the Malmberget region (e.g. Aitik), which were formed by a similar process and hosted by the volcanicsvolcanoclastics of the 1.9Ga old Porphyry group, are slightly below zero %0, indicating a magmatic origin. The existence of different sulphur compositions for these mineralization types formed by a similar hydrothermal process, probably reflects the influence of the host rock, the solutions leaching pre-existing sulphides.In southern Norrbotten, epigenetic, Cu-Zn-Pb veintype mineralizations in metavolcanics and metasediments have 634S values close to zero %0 indicating a magmatic origin. The sulphur isotope data of the volcanogenic, massive sulphide ores of the Skellefte district, in particular the ores of the Adak dome, are close to zero %0.The lead and sulphur isotopic features of the sulphides in northern Sweden show that the ore-forming processes were of a different nature on both sides of the ArcheanProterozoic border, implying differences in the crustal development. Lead isotopes show that lead was mobilized from specific sources on each side of the border. The sulphur of the sulphides in the Greenstone group in NE Sweden and Finland was introduced by sedimentary processes, whereas the sulphur of the sulphide occurrences towards the SW, mainly in the Porphyry group, is dominated by a magmatic sulphur component.

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“…The rocks of the Porphyry group are mildly alkaline, and Martinsson & Perdahl (1995) suggested formation in an extensional environment. Radiometrically dated units include a 1882 ± 24 Ma metar hyolite near Kiruna (Welin, 1987), and two felsic metavolcanic rocks yielding identical ages of 1909 +17/-16 (Skiöld & Cliff, 1984).…”

Section: Main Geological Units Of the Norrbotten Provincementioning

confidence: 99%

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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The depositional evolution of the Svecofennian supracrustal sequence in Finland and Sweden

Cited by 127 publications

References 29 publications

New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield

New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield

Sulphur isotopes in Lower Proterozoic iron and sulphide ores in northern Sweden

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

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