A new tectonic model for the Palaeoproterozoic Kautokeino Greenstone Belt, northern Norway, based on high-resolution airborne magnetic data and field structural analysis and implications for mineral potential

Henderson, I. H. C.; Viola, Giulio; Nasuti, Aziz

doi:10.17850/njg95-3-05

Cited by 12 publications

(48 citation statements)

References 65 publications

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“…3 & Table 1). Lineaments such as major faults, shear zones and even thick dykes can be detected quite clearly using these data, especially where aeromagnetic anomalies show offsets or are abruptly truncated (see also Henderson et al, 2015;Nasuti et al, 2015). The orientations of these lineaments vary across the SKT but are mostly NW-SE to NNW-SSE.…”

Section: Resultsmentioning

confidence: 84%

“…The mafic volcanites record strong magnetic anomaly signals, so much so that the KKGB can easily be traced northnorthwestwards beneath the Caledonian nappes and clearly links up with a comparable volcanosedimentary assemblage in the Alta-Kvaenangen Window (Fig. 4; Åm, 1975;Olesen et al, 1990;Henderson et al, 2015). Similar mafic-dominated assemblages occur northeast of Altafjorden in the Altenes and Repparfjord tectonic windows (Fareth, 1979;Pharaoh et al, 1983;, and it is quite clear that the positive magnetic anomalies can be traced continuously from the KKGB to the Repparfjord window.…”

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

confidence: 96%

“…These terranes, the Karasjok Greenstone Belt (KSGB), Jergol Gneiss Complex (JGC), Kautokeino Greenstone Belt (KKGB) and Ráiseatnu Gneiss Complex (RGC) (Fig. 2), are described in detail in other contributions, some of which are in this volume (Braathen & Davidsen, 2000;Henderson et al, 2015;Melezhik et al, 2015;.…”

Section: Geology Of Finnmark and North Tromsmentioning

confidence: 99%

“…In Finnmark, aeromagnetic data in particular have already been applied in investigating the geological structures and greenstone belts (Olesen & Solli, 1985;Olesen et al, 1990;Olesen & Sandstad, 1993;Henderson et al, 2015). However, due to inaccurate correction of diurnal artefacts, navigation errors and poor resolution of some of the vintage magnetic data acquired in the 1960s and 1970s in northernmost Norway, the corresponding magnetic dataset (e.g., Skilbrei et al, 1991;Olesen et al, 2010) was of relatively low quality and not entirely reliable for accurate qualitative and quantitative interpretation.…”

Section: Aeromagnetic Datamentioning

confidence: 99%

“…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%

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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

NJG

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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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Section: Resultsmentioning

confidence: 84%

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

confidence: 96%

Section: Geology Of Finnmark and North Tromsmentioning

confidence: 99%

Section: Aeromagnetic Datamentioning

confidence: 99%

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

confidence: 99%

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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

NJG

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The quest for a sustainable industry: mining, path dependency and post-carbon regime in the European Arctic

Vidal

2024

Miner Econ

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The goal of the European Union’s Green Deal industrial plan is to achieve an ecological transition over the next three decades. This transition includes the electrification of energy and transport systems. Achieving such a transformation requires access to critical raw materials for the technologies that will enable the post-carbon transition of European societies. In this context, the European Arctic (also referred to as the Barents region) is seen as a key asset that can contribute to the EU’s green plan, in particular due to its high potential for mineral resources. Since the 19th century, Europe’s northernmost regions have developed a long tradition of mining activities (e.g., Swedish iron ore, which has been mined by LKAB). Fennoscandia’s mineral potential opens up new prospects for the industry. However, fundamental challenges lie ahead, such as the impact of climate change, pollution management, and social acceptability. Although the Nordic countries have based the economic development of their northern regions on sustainable principles, the concept of sustainable mining and its operational implementation have their shortcomings, such as sustained land use conflicts with the Sámi people. In addition, the possibility of missing some key governance linkages may lead to new path dependencies due to a lack of a systemic vision. Once these issues are addressed, the Nordic mining industry could spearhead this defining process for Europe’s ecological transition.

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Integrated 3D geophysical and geological modelling of the Kautokeino Greenstone Belt in Finnmark, northern Norway

Nasuti¹,

Olesen²,

Maystrenko³

2022

NJG

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A new 3D crustal-scale model has been created for the Kautokeino Greenstone Belt (KKGB) in northern Norway based on 3D density modelling and aeromagnetic data, integrated with qualitative interpretation of geophysical and geological data. Detailed geophysical analyses and their integration with an existing petrophysical database allowed us to identify and interconnect shallow and deeper structures throughout the study area. To have better control on the regional tectonic setting of the KKGB, the model area has been extended to include the northern part of Finland and Sweden. The new 3D density model reveals that the KKGB is broader than supposed previously.The 3D analysis indicates that the belt reaches depths of approximately 5-6 km and is emplaced as a highly deformed structure between the Archaean Jergul Gneiss Complex (JGC) to the east and the Rommaeno Gneiss Complex (RoGC) in Finland to the west. The Ráiseatnu Gneiss Complex (RaGC) in the western part of the KKGB is characterised by a dominant NNW-SSE magnetic trend that is sub-parallel to the main trend of the KKGB. Moreover, the RaGC is similar to the KKGB in terms of the presence of a large number of sub-parallel magnetic anomalies. This gneiss complex shows mostly short-wavelength anomalies and some circular anomalies that differ from the more subdued and irregular anomaly pattern of the JGC and RoGC. In the new 3D model, the RaGC is assumed to constitute a migmatised part of the Kautokeino Greenstone Belt. At a large scale, this Proterozoic greenstone belt has some similarities to Archaean counterparts, where most of the deformation is caused by gravitational tectonics. This study shows that careful integration of geological and geophysical data can strongly improve the 3D understanding of the complex, poorly exposed, Precambrian terranes of the Finnmarksvidda region in Norway.

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A new tectonic model for the Palaeoproterozoic Kautokeino Greenstone Belt, northern Norway, based on high-resolution airborne magnetic data and field structural analysis and implications for mineral potential

Cited by 12 publications

References 65 publications

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

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

The quest for a sustainable industry: mining, path dependency and post-carbon regime in the European Arctic

Integrated 3D geophysical and geological modelling of the Kautokeino Greenstone Belt in Finnmark, northern Norway

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