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

Bingen, Bernard; Solli, Arne; Viola, Giulio; Torgersen, Espen; Sandstad, Jan Sverre; Whitehouse, Martin J.; Røhr, Torkil S.; Ganerød, Morgan; Nasuti, Aziz

doi:10.17850/njg95-3-09

Cited by 10 publications

(16 citation statements)

References 77 publications

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“…10I; Bingen et al, 2015). An Ar-Ar biotite plateau age of 1743 ± 4 Ma probably constrains the end of regional metamorphism in this area (Bingen et al, 2015), and is in agreement with a Re-Os age of molybdenite from the Cu-mineralised Middle Dolostone Member of the Gorahatjohka Formation at ~1765 Ma (Perelló et al, 2015).…”

Section: Tectonic Setting and Regional Correlationssupporting

confidence: 67%

“…These rocks could possibly represent correlatives of the Masi quartzites and the albite diabase sills in the Kautokeino Greenstone Belt ( Fig. 1A; Solli, 1983), the latter of which were emplaced at 2220 ± 7 Ma (Bingen et al, 2015). The Ulveryggen Formation and intrusions form the lowermost part of the proposed stratigraphy of the RTW, but their characteristics diverge significantly from those of the overlying succession, which instead point toward a convergent margin setting.…”

Section: Tectonic Setting and Regional Correlationsmentioning

confidence: 98%

“…These greenstone belts developed during protracted intraplate rifting, and progressive fragmentation of the Fennoscandian Shield between approximately 2.4 and 2.0 Ga. Rifting was eventually succeeded by ocean closure and collision during the Svecofennian orogeny (Melezhik & Hanski, 2013b). Although recent radio metric age constraints confirm that the Repparfjord volcanosedimentary succession is of Early Palaeoproterozoic age (Perelló et al, 2015;Torgersen et al, 2015), a comparison with new geochronological constraints from nearby greenstone belts in northern Norway (e.g., Melezhik et al, 2015;Bingen et al, 2015) challenges the classic, lithologybased correlations. A direct correlation with neighbouring greenstone belts is not supported by sedimento logical characteristics and stable isotope compo sition of carbonate rocks in the RTW (Torgersen, 2015).…”

Section: Basaltic Lavasmentioning

confidence: 98%

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Revised structure and stratigraphy of the northwestern Repparfjord Tectonic Window, northern Norway

Torgersen¹,

Viola²,

Sandstad³

2016

NJG

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The Repparfjord Tectonic Window (RTW) consists of a ~8 km-thick low-grade, weakly deformed Early Palaeoproterozoic volcano-sedimentary succession that hosts abundant Cu mineralisations. Two major, sediment-hosted, Cu-deposits occur in the Saltvatnet Group, a <6 km-thick sequence of mainly coarse-grained clastic rocks that forms the core subject of the present study. Results from new mapping, structural analysis and whole-rock geochemistry from the northwestern part of the RTW are presented and used in association with high-resolution geophysical data to propose a revised stratigraphy of the Repparfjord volcano-sedimentary succession and its tectonic and geodynamic settings. The Saltvatnet Group is better characterised as containing four formations, now including also the uppermost volcaniclastic siltstones and dolostone members of the herein newly defined Gorahatjohka Formation. Field oberservations and structural analysis show that the current geometry of the Saltvatnet Group is that of a km-scale, upright, NE-SW-trending anticline, the Ulveryggen anticline, cored by the Saltvatnet Group, which thus represents the lowermost exposed rocks of the RTW. New and existing geochemical data are used to demonstrate that the two volcanic-dominated Nussir and Holmvatnet groups, which crop out on either side of the Ulveryggen anticline, have similar geochemical character and can be interpreted as temporal and lateral correlatives. The basaltic Ulveryggen intrusions within the Saltvatnet Group are geochemically different from any other igneous rocks in the RTW, suggesting that these intruded prior to the volcanic-dominated groups in the RTW. The revised stratigraphy of the RTW is interpreted as reflecting deposition and volcanism in an evolving continental back-arc, which contrasts with the purely intraplate rift setting inferred for most parts of the Fennoscandian Shield in the Early Palaeoproterozoic.

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Section: Tectonic Setting and Regional Correlationssupporting

confidence: 67%

Section: Tectonic Setting and Regional Correlationsmentioning

confidence: 98%

Section: Basaltic Lavasmentioning

confidence: 98%

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Revised structure and stratigraphy of the northwestern Repparfjord Tectonic Window, northern Norway

Torgersen¹,

Viola²,

Sandstad³

2016

NJG

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“…The eastern and western borders of the belt are intruded by younger granites, granodiorites and diorites. This c. 50 km-wide, strongly sheared, greenstone belt (Olesen et al, 1990;Olesen & Sandstad, 1993;Henderson et al, 2015;Bingen et al, 2015) is dominated by mafic volcanic rocks but also includes two metasedimentary formations. Amphibolitised basaltic volcanites are the principal lithologies, both lavas and tuffs, also with Cross-cutting faults and also dykes are visible in the aeromagnetic data within the TB.…”

Section: Figure 8 (A) Tilt-derivative Of Magnetic Data (B) Ternary mentioning

confidence: 99%

“…2; Siedlecka et al, 1985;Bingen et al, 2015). The Karasjok Greenstone Belt (KSGB), below the TB and east of the mainly tonalitic gneisses of the domal Jergol Gneiss Complex (JGC), consists of a thick volcanosedimentary succession divided into several formations with a total thickness in the range 7-10 km (Siedlecka et al, 1985;Midtun, 1988;Skaar, 2014).…”

Section: Figure 8 (A) Tilt-derivative Of Magnetic Data (B) Ternary mentioning

confidence: 99%

New high-resolution aeromagnetic and radiometric surveys in Finnmark and North Troms: linking anomaly patterns to bedrock geology and structure

Nasuti¹,

Roberts²,

Dumais³

et al. 2016

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New high-resolution aeromagnetic data from the Caledonides and Archaean-Palaeoproterozoic crystalline basement of Finnmark and North Troms derived from surveys conducted as part of NGU's MINN programme provide spectacular and confirmatory evidence for the continuation of diverse, Precambrian greenstone belts and granulite terranes beneath the magnetically transparent Caledonian nappes. Complementary airborne radiometric data collected in the same survey contribute to the analytical process and to an evaluation of the mineral potential in the area. Some parts of existing data have also been reprocessed using new techniques and software to reach the same level as the newly acquired data. The new compiled data provide images of the magnetic field at sufficiently high resolution to allow us to examine finer details of the bedrock geology. One of the principal outcomes of the analysis is a picture of the detailed structural fabric of the region provided by images of tilt derivatives of the magnetic field that enhance anomalies. This fabric is an important framework for developing exploration strategies. Patterns and other characteristics of the magnetic field have been used to revise positions of some geological boundaries, especially in poorly exposed areas, and delineate specific domains within northern Norway. Radiometric data have been used to supplement the magnetic interpretations in some cases. In general, there is a good correlation between the radiometric data and magnetic anomaly maps which can be utilised to re-evaluate the geological boundaries. Several such features of interest are discussed. As an example, NW-SE-trending, fault-bounded terranes or belts which extend from Finnmark and Troms through northern Finland, Sweden and Russia can be easily followed on the high-resolution data. In this contribution, all the main geological terranes from the Archaean-Palaeoproterozoic belt to the Caledonian nappes in northern Norway will be discussed in relation to their magnetic patterns and radiometric anomalies.

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Evolution of the Gállojávri ultramafic intrusion from U-Pb zircon ages and Rb-Sr, Sm-Nd and Lu-Hf isotope systematics

Orvik

Slagstad

Sørensen

et al. 2022

Precambrian Research

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

Cited by 10 publications

References 77 publications

Revised structure and stratigraphy of the northwestern Repparfjord Tectonic Window, northern Norway

Revised structure and stratigraphy of the northwestern Repparfjord Tectonic Window, northern Norway

New high-resolution aeromagnetic and radiometric surveys in Finnmark and North Troms: linking anomaly patterns to bedrock geology and structure

Evolution of the Gállojávri ultramafic intrusion from U-Pb zircon ages and Rb-Sr, Sm-Nd and Lu-Hf isotope systematics

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