Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
2.5D geophysical model of the Gällivare mining area: An integrated study to model the top 4km of the subsurface and guide for future exploration activities
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. Section for Natural Hazards, Norwegian Geotechnical Institute, 3930 Ullevaal Stadion, Oslo, N‐0806 Norway.ORCID iD: 0000-0002-0260-5340
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. Mining Inspectorate of Sweden, Varvsgatan 41, Luleå, 97232 Sweden.ORCID iD: 0000-0002-7413-4461
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-1627-7058
2021 (English)In: Geophysical Prospecting, ISSN 0016-8025, E-ISSN 1365-2478, Vol. 69, no 4, p. 821-841Article in journal (Refereed) Published
Abstract [en]

Potential field and Slingram data alongside rock physical properties, drill‐core information and results from geological field mapping were used to investigate the geometry of the geological structures in the Gällivare area in regional scale. The main purpose of this study was to delineate the vertical and lateral extension of the Malmberget felsic volcanic rocks, the Dundret and Vassaravaara units as well as geological structures related to the crustal‐scale Nautanen deformation zone. Furthermore, we aimed at identifying new magnetite‐hematite and sulphide mineralizations and lithologies related to the mineralizations based on the results from regional‐scale potential field modelling which are delineated with rock physical properties and borehole data. The study result indicated that the dome‐shaped Dundret gabbro extends downwards to ∼4 km depth and has its maximum depth at its centre. Hematite and magnetite assemblages occur within the top 2 km of the Dundret complex. Felsic volcanic rocks in the Malmberget area extend vertically down to a maximum depth of ∼3 km and get considerably thinner towards the west. The model for the known magnetite‐rich mineralizations in Malmberget was inferred from earlier drilling activities and was integrated into the profile models, which indicates a reasonable fit to the measured data, in particular on the magnetic anomaly; whereas the small dimensions of the modelled structures make them invisible on the Bouguer anomaly data. Additional magnetite‐rich mineralizations are suggested within the Malmberget felsic rocks. High real component and low imaginary response of the Slingram data suggests conductive zones within the Nautanen deformation zone towards the NE, which given the geology of the area in the high strain zone can indicate disseminated sulphide mineralizations. Drill‐hole data at the eastern parts of W‐E profiles agreed well with the suggested model inferred from potential field data, suggesting presence of mafic intrusions within the ∼top 1 km of the subsurface. The integrated model based on geophysical, petrophysical and geological data improved earlier understanding about the regional geometry of the key structures in the Gällivare area and indicates new magnetite‐rich and sulphide mineralization prospects which can be used as a guide for future exploration activities in the area.

Place, publisher, year, edition, pages
John Wiley & Sons, 2021. Vol. 69, no 4, p. 821-841
Keywords [en]
Gällivare area, potential field data, 2.5D modeling, Slingram data, geophysical investigation, rock physical properties
National Category
Geophysics
Research subject
Ore Geology; Exploration Geophysics; Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-82810DOI: 10.1111/1365-2478.13077ISI: 000626154500001Scopus ID: 2-s2.0-85102201190OAI: oai:DiVA.org:ltu-82810DiVA, id: diva2:1526400
Projects
Multi‐scale 4‐dimensional geological modeling of the Gällivare area
Funder
Vinnova
Note

Validerad;2021;Nivå 2;2021-04-20 (alebob);

Finansiär: Boliden Mineral AB, LKAB

Available from: 2021-02-08 Created: 2021-02-08 Last updated: 2021-04-20Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Tavakoli, SamanSarlus, ZmarKronsell, IdaBauer, Tobias E.

Search in DiVA

By author/editor
Tavakoli, SamanSarlus, ZmarKronsell, IdaBauer, Tobias E.
By organisation
Geosciences and Environmental EngineeringMining and Geotechnical Engineering
In the same journal
Geophysical Prospecting
Geophysics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 291 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf