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Kronsell, Ida
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Publikasjoner (3 av 3) Visa alla publikasjoner
Tavakoli, S., Sarlus, Z., Kronsell, I. & Bauer, T. E. (2021). 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. Geophysical Prospecting, 69(4), 821-841
Åpne denne publikasjonen i ny fane eller vindu >>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
2021 (engelsk)Inngår i: Geophysical Prospecting, ISSN 0016-8025, E-ISSN 1365-2478, Vol. 69, nr 4, s. 821-841Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2021
Emneord
Gällivare area, potential field data, 2.5D modeling, Slingram data, geophysical investigation, rock physical properties
HSV kategori
Forskningsprogram
Malmgeologi; Prospekteringsgeofysik; Geoteknik
Identifikatorer
urn:nbn:se:ltu:diva-82810 (URN)10.1111/1365-2478.13077 (DOI)000626154500001 ()2-s2.0-85102201190 (Scopus ID)
Prosjekter
Multi‐scale 4‐dimensional geological modeling of the Gällivare area
Forskningsfinansiär
Vinnova
Merknad

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

Finansiär: Boliden Mineral AB, LKAB

Tilgjengelig fra: 2021-02-08 Laget: 2021-02-08 Sist oppdatert: 2021-04-20bibliografisk kontrollert
Tavakoli, S. & Kronsell, I. (2021). Tailing site characterizations using near-surface geophysical tools in south-central Sweden. In: NSG2021 27th European Meeting of Environmental and Engineering Geophysics: . Paper presented at Near Surface Geoscience Conference and Exhibition 2021(NSG 2021), Bordeaux, France, August 29 - September 2, 2021. European Association of Geoscientists and Engineers, 2021, Article ID 20.
Åpne denne publikasjonen i ny fane eller vindu >>Tailing site characterizations using near-surface geophysical tools in south-central Sweden
2021 (engelsk)Inngår i: NSG2021 27th European Meeting of Environmental and Engineering Geophysics, European Association of Geoscientists and Engineers, 2021, Vol. 2021, artikkel-id 20Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Ground Penetrating Radar (GPR) data with two different antenna frequencies i.e. 250 and 300 MHz were used to characterize the spatial distribution of the mine tailings and also image the ground-water level in the tailing repository area of an abandoned mine site in Yxsjöberg. GPR result, after processing provided high-resolution image of the subsurface down to maximum ca. 3.2 m depth which indicated higher for the instrument with 250 MHz antenna frequency, compared to 0.7 m effective penetration depth indicated by the instrument with 300 MHz antenna. The vertical continuation of the tailings was identified down to ca. 0.7 m in the results from both antennas and ground water table was indicated at ca. 3 m depth using the 250 MHz antenna, consistent with data from the nearby well. Self-potential (SP) data indicated steady results; however, incompatible with the topography variations, which is presumably produced due to 3D topography variations being compared with 2D SP data. The link between SP data and topography variations and thereby, ground water movement can be further studied using a 3D SP measurement to better understand the direction of the ground water movement and also check its correlation with topography variations at the site.

sted, utgiver, år, opplag, sider
European Association of Geoscientists and Engineers, 2021
HSV kategori
Forskningsprogram
Geoteknik
Identifikatorer
urn:nbn:se:ltu:diva-89869 (URN)10.3997/2214-4609.202120020 (DOI)2-s2.0-85125229063 (Scopus ID)
Konferanse
Near Surface Geoscience Conference and Exhibition 2021(NSG 2021), Bordeaux, France, August 29 - September 2, 2021
Tilgjengelig fra: 2022-03-31 Laget: 2022-03-31 Sist oppdatert: 2022-04-12bibliografisk kontrollert
Kronsell, I., Nigéus, S., Virolainen, A., Jia, Y., Pabst, T. & Marurice, C. (2020). Amelioration of permeable soil with green liquor dregs for the construction of sealing layers for mine waste storage facilities. In: R. Cardoso, C. Jommi, E. Romero (Ed.), 4th European Conference on Unsaturated Soils (E-UNSAT 2020): . Paper presented at 4th European Conference on Unsaturated Soils (E-UNSAT 2020), 19-21 October, 2020, Lisboa, Portugal. EDP Sciences, Article ID 06006.
Åpne denne publikasjonen i ny fane eller vindu >>Amelioration of permeable soil with green liquor dregs for the construction of sealing layers for mine waste storage facilities
Vise andre…
2020 (engelsk)Inngår i: 4th European Conference on Unsaturated Soils (E-UNSAT 2020) / [ed] R. Cardoso, C. Jommi, E. Romero, EDP Sciences, 2020, artikkel-id 06006Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Mining of sulfidic ore generates acidic waste which often leads to the generation of acid rock drainage (ARD) having an adverse impact on aquatic flora and fauna. Engineered multilayer cover is one of the commonly used methods to prevent oxygen from being transported to mine waste. The sealing layer has a key function in the cover, thanks to its high water retention capacity and a low hydraulic conductivity, which enable the layer to remain near water saturation, effectively hindering oxygen diffusion. When adequate material is not available improvement of local soil material with a sealing agent is principally the only option to produce sealing layer material. Apart from bentonite clay, Green Liquor Dregs (GLD), a waste from the pulp and paper industry, have the ability to reduce the oxygen diffusion when mixed to granular soil, improving the water retention capacity of the blend. Experience from the development of Till/GLD-blends for the construction of sealing layers is compiled to address issue related to soil amelioration using waste with focus on material variation and quality control. The presentation focuses on the opportunities and challenges for the establishment of a circular system based on reutilization of a waste, herein GLD for improvement of soil’s geotechnical property.

sted, utgiver, år, opplag, sider
EDP Sciences, 2020
Serie
E3S Web of Conferences, E-ISSN 2267-1242 ; 195
HSV kategori
Forskningsprogram
Geoteknik
Identifikatorer
urn:nbn:se:ltu:diva-82775 (URN)10.1051/e3sconf/202019506006 (DOI)000659488200137 ()2-s2.0-85097132804 (Scopus ID)
Konferanse
4th European Conference on Unsaturated Soils (E-UNSAT 2020), 19-21 October, 2020, Lisboa, Portugal
Forskningsfinansiär
Mistra - The Swedish Foundation for Strategic Environmental ResearchEU, Horizon 2020, 730305, H2020-MSCA-RISE-2017, 778120
Tilgjengelig fra: 2021-02-04 Laget: 2021-02-04 Sist oppdatert: 2021-06-30bibliografisk kontrollert
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