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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
Open this publication in new window or tab >>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 (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
Keywords
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:nbn:se:ltu:diva-82810 (URN)10.1111/1365-2478.13077 (DOI)000626154500001 ()2-s2.0-85102201190 (Scopus ID)
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
Patel, D., Langeland, T., Tavakoli, S. & Fjeld, M. (2021). Groupware for Research on Subsurface CO2 Storage (1ed.). In: Daniel Patel (Ed.), Interactive Data Processing and 3D Visualization of the Solid Earth: (pp. 291-323). Springer
Open this publication in new window or tab >>Groupware for Research on Subsurface CO2 Storage
2021 (English)In: Interactive Data Processing and 3D Visualization of the Solid Earth / [ed] Daniel Patel, Springer, 2021, 1, p. 291-323Chapter in book (Other academic)
Abstract [en]

Directed towards the multidisciplinary research field on carbon capture and storage (CCS), this paper reports empirically on progress towards a groupware system (collaborative software) and experiences learned when creating groupware for CCS research. As subsurface CO2 storage requires collaboration across a wide range of CCS disciplines, we describe the collaborative challenges faced and how our proposed groupware addresses these, and present criteria for CCS groupware and a field study over three iterations evaluating how well various software systems fulfill those criteria. In iteration one, we evaluate a commercial and feature-rich stand-alone application used together with a conferencing application. Based on this evaluation, in iteration two we develop and evaluate a custom-built lightweight web application. In the third and last iteration, we present a prototype that uses the most useful features from the two evaluated solutions. Finally, we give a suggestion of how to implement a groupware fulfilling all requirements identified for a successful CCS groupware.

Place, publisher, year, edition, pages
Springer, 2021 Edition: 1
National Category
Other Earth and Related Environmental Sciences
Research subject
Applied Geophysics
Identifiers
urn:nbn:se:ltu:diva-97521 (URN)10.1007/978-3-030-90716-7_9 (DOI)2-s2.0-85152849456 (Scopus ID)978-3-030-90715-0 (ISBN)978-3-030-90716-7 (ISBN)
Available from: 2023-05-24 Created: 2023-05-24 Last updated: 2023-05-24Bibliographically approved
Tavakoli, S., Bauer, T., Rasmussen, T. M., Weihed, P. & Elming, S.-å. (2016). Deep massive sulphide exploration using 2D and 3D geoelectrical and induced polarization data in Skellefte mining district, northern Sweden (ed.). Geophysical Prospecting, 64(6), 1602-1619
Open this publication in new window or tab >>Deep massive sulphide exploration using 2D and 3D geoelectrical and induced polarization data in Skellefte mining district, northern Sweden
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2016 (English)In: Geophysical Prospecting, ISSN 0016-8025, E-ISSN 1365-2478, Vol. 64, no 6, p. 1602-1619Article in journal (Refereed) Published
Abstract [en]

Geoelectrical and induced polarization data from measurements along three profiles and from one 3D survey are acquired and processed in the central Skellefte District, northern Sweden. The data were collected during two field campaigns in 2009 and 2010 in order to delineate the structures related to volcanogenic massive sulphide deposits and to model lithological contacts down to a maximum depth of 1.5 km. The 2009 data were inverted previously, and their joint interpretation with potential field data indicated several anomalous zones. The 2010 data not only provide additional information from greater depths compared with the 2009 data but also cover a larger surface area. Several high-chargeability low-resistivity zones, interpreted as possible massive sulphide mineralization and associated hydrothermal alteration, are revealed. The 3D survey data provide a detailed high-resolution image of the top ∼450 m of the upper crust around the Maurliden East, North, and Central deposits. Several anomalies are interpreted as new potential prospects in the Maurliden area, which are mainly concentrated in the central conductive zone. In addition, the contact relationship between the major geological units, e.g., the contact between the Skellefte Group and the Jörn Intrusive Complex, is better understood with the help of 2010 deep-resistivity/chargeability data. The bottommost part of the Vargfors basin is imaged using the 2010 geoelectrical and induced polarization data down to ∼1-km depth.

National Category
Geophysics Geology
Research subject
Exploration Geophysics; Ore Geology
Identifiers
urn:nbn:se:ltu:diva-15251 (URN)10.1111/1365-2478.12363 (DOI)000386158100014 ()2-s2.0-84961572568 (Scopus ID)ebf80035-8141-4c62-94db-d97a3d1a5641 (Local ID)ebf80035-8141-4c62-94db-d97a3d1a5641 (Archive number)ebf80035-8141-4c62-94db-d97a3d1a5641 (OAI)
Note

Validerad; 2016; Nivå 2; 2016-11-21 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-09-05Bibliographically approved
Tavakoli, S., Dehghannejad, M., de los Ángeles García Juanatey, M., Bauer, T., Weihed, P. & Elming, S.-Å. (2016). Potential Field, Geoelectrical and Reflection Seismic Investigations for Massive Sulphide Exploration in the Skellefte Mining District, Northern Sweden. Acta Geophysica, 64(6), 2171-2199
Open this publication in new window or tab >>Potential Field, Geoelectrical and Reflection Seismic Investigations for Massive Sulphide Exploration in the Skellefte Mining District, Northern Sweden
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2016 (English)In: Acta Geophysica, ISSN 1895-6572, E-ISSN 1895-7455, Vol. 64, no 6, p. 2171-2199Article in journal (Refereed) Published
Abstract [en]

Multi-scale geophysical studies were conducted in the central Skellefte district (CSD) in order to delineate the geometry of the upper crust (down to maximum ∼ 4.5 km depth) for prospecting volcanic massive sulphide (VMS) mineralization. These geophysical investigations include potential field, resistivity/induced polarization (IP), reflection seismic and magnetotelluric (MT) data which were collected between 2009 and 2010. The interpretations were divided in two scales: (i) shallow (∼ 1.5 km) and (ii) deep (∼4.5 km). Physical properties of the rocks, including density, magnetic susceptibility, resistivity and chargeability, were also used to improve interpretations. The study result delineates the geometry of the upper crust in the CSD and new models were suggested based on new and joint geophysical interpretation which can benefit VMS prospecting in the area. The result also indicates that a strongly conductive zone detected by resistivity/IP data may have been missed using other geophysical data.

National Category
Geophysics
Research subject
Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-61500 (URN)10.1515/acgeo-2016-0088 (DOI)000391967700009 ()2-s2.0-85008870575 (Scopus ID)
Note

Validerad; 2017; Nivå 1; 2017-01-18 (andbra)

Available from: 2017-01-18 Created: 2017-01-18 Last updated: 2023-09-05Bibliographically approved
Sarlus, Z., Bauer, T., Tavakoli, S., Wanhainen, C., Nordin, R. & Andersson, J. (2015). Geochemistry of Ultramafic-Mafic Units Related to Fe-, Cu-, and Au Deposits in the Gallivare Region, Northern Norrbotten, Sweden (ed.). In: (Ed.), A.S. Andre-Mayer; M. Cathelineau; P. Muchez; E. Pirard; S. Sindern (Ed.), Mineral Resources in a Sustainable World: . Paper presented at SGA Biennial Meeting on Mineral Resources in a Sustainable World : 24/08/2015 - 27/08/2015 (pp. 1123-1126).
Open this publication in new window or tab >>Geochemistry of Ultramafic-Mafic Units Related to Fe-, Cu-, and Au Deposits in the Gallivare Region, Northern Norrbotten, Sweden
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2015 (English)In: Mineral Resources in a Sustainable World / [ed] A.S. Andre-Mayer; M. Cathelineau; P. Muchez; E. Pirard; S. Sindern, 2015, p. 1123-1126Conference paper, Published paper (Refereed)
Abstract [en]

Geochemical investigations were carried out in the Gallivare area as a part of a larger project aiming to understand the crustal architecture of the region in 3D. Major igneous suites such as the Dundret and Vassaravaara intrusions with additional smaller mafic intrusions have been identified as key localities and investigated. Results indicate two distinct rock units. The first suite is assigned to ultramafic-mafic layered intrusions with a calc-alkaline to a more tholeiitic composition belonging to the Dundret and Vassaravaara intrusions. The second suite is mainly of mafic to intermediate composition with a clear ophitic texture. This paper investigate the source and origin of the key rock suites, playing a major role on the evolution of the Gallivare region, a region which is characterized by porphyry Cu, IOCG, and Al0 deposits including some of Europe's top producing Fe and Cu-Au-Ag (-Mo) mines.

National Category
Geology Geophysics
Research subject
Ore Geology; Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-37771 (URN)be4fc3ff-2b8b-40a1-93d4-0438cfc12186 (Local ID)978-2-85555-066-4 (ISBN)be4fc3ff-2b8b-40a1-93d4-0438cfc12186 (Archive number)be4fc3ff-2b8b-40a1-93d4-0438cfc12186 (OAI)
Conference
SGA Biennial Meeting on Mineral Resources in a Sustainable World : 24/08/2015 - 27/08/2015
Note
Validerad; 2016; Nivå 1; 20160621 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2022-10-27Bibliographically approved
Sarlus, Z., Bauer, T., Tavakoli, S., Wanhainen, C., Nordin, R. & Andersson, J. (2015). Geochemistry of Ultramafic-mafic Units Related to Fe-, Cu-, and Au Deposits in the Gällivare Region, Northern Norrbotten, Sweden (ed.). Paper presented at SGA 2015 : 24/08/2015 - 27/08/2015. Paper presented at SGA 2015 : 24/08/2015 - 27/08/2015.
Open this publication in new window or tab >>Geochemistry of Ultramafic-mafic Units Related to Fe-, Cu-, and Au Deposits in the Gällivare Region, Northern Norrbotten, Sweden
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2015 (English)Conference paper, Oral presentation only (Refereed)
National Category
Geology Geophysics
Research subject
Ore Geology; Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-39622 (URN)e7340cad-f9e7-4191-8db9-69861ba1781f (Local ID)e7340cad-f9e7-4191-8db9-69861ba1781f (Archive number)e7340cad-f9e7-4191-8db9-69861ba1781f (OAI)
Conference
SGA 2015 : 24/08/2015 - 27/08/2015
Note
Godkänd; 2015; 20160518 (zimsar)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2023-09-06Bibliographically approved
Bauer, T., Skyttä, P., Hermansson, T., Dehghannejad, M. & Tavakoli, S. (2015). The Skellefte District. In: Pär Weihed (Ed.), 3D, 4D and Predictive Modelling of Major Mineral Belts in Europe: (pp. 93-121). Encyclopedia of Global Archaeology/Springer Verlag
Open this publication in new window or tab >>The Skellefte District
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2015 (English)In: 3D, 4D and Predictive Modelling of Major Mineral Belts in Europe, Encyclopedia of Global Archaeology/Springer Verlag, 2015, p. 93-121Chapter in book (Refereed)
Abstract [en]

Four-dimensional geological modelling has been conducted in the Palaeoproterozoic Skellefte mining district. 3D-modelling of volcanic-hosted massive sulphide deposits and associated host-rocks has been carried out in multiple scales from deposit to regional scale and is based on a combination of geological and geophysical investigations. A conceptual model founded on unravelling the structural control on sedimentation, volcanism and mineralization and the subsequent deformation patterns, acts as a base for geological modelling. The final 3D-model provides a structural framework in which the mineralizations can be studied by improved understanding of the structural evolution in the mine areas, and by comparing the regional structural patterns versus the form and attitude of ore deposits. Additionally, uncertainty and prospectivity models were constructed showing the distribution of data and the potential of discovering new ore deposits. Subsequent 4D-modelling adds the time aspect to the 3D-models and aims at visualizing and understanding the geological history in the district and as a support for ore targeting. Moreover, adding geological time to the modelling helps gaining confidence about both the conceptual models and the 3D-models. The final 3D- and 4D-models provide a regional three-dimensional context for both industrial and academic activities in the Skellefte district, and aid the understanding of large-scale tectonic processes.

Place, publisher, year, edition, pages
Encyclopedia of Global Archaeology/Springer Verlag, 2015
Series
Mineral Resource Reviews, ISSN 2365-0559
National Category
Geology Geophysics
Research subject
Ore Geology; Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-20136 (URN)10.1007/978-3-319-17428-0_5 (DOI)23f5ae7f-c9ac-47af-80a3-7231acc6c47a (Local ID)23f5ae7f-c9ac-47af-80a3-7231acc6c47a (Archive number)23f5ae7f-c9ac-47af-80a3-7231acc6c47a (OAI)
Note

Godkänd; 2015; 20150818 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2022-10-27Bibliographically approved
Tavakoli, S. & Langeland, T. (2014). VIRCOLA: A tool for visualization and cross-discipline collaboration related to CO2 storage (ed.). In: (Ed.), Fourth EAGE CO2 Geological Storage Workshop: Demonstrating storage integrity and building confidence in CCS. Paper presented at EAGE CO2 Geological Storage Workshop : Demonstrating Storage Integrity and Building Confidence in CCS 22/04/2014 - 24/04/2014 (pp. 270-274). European Association of Geoscientists and Engineers, EAGE, Article ID 107367.
Open this publication in new window or tab >>VIRCOLA: A tool for visualization and cross-discipline collaboration related to CO2 storage
2014 (English)In: Fourth EAGE CO2 Geological Storage Workshop: Demonstrating storage integrity and building confidence in CCS, European Association of Geoscientists and Engineers, EAGE , 2014, p. 270-274, article id 107367Conference paper, Published paper (Refereed)
Abstract [en]

The VIRCOLA project addresses important challenges, which arise in cross-disciplinary research related to subsurface storage of CO2. The specific background for the VIRCOLA project is the research work performed in the SUCCESS centre (Subsurface CO2 storage - Critical Elements and Superior Strategy). One of the case studies in the SUCCESS centre is the Longyearbyen CO2 Lab in Svalbard. A key challenge in working with a large, multidisciplinary project such as SUCCESS is large amount of available data. It is also challenging to utilize and visualize the multi-scale and multimodal data types. Additionally, it is a challenge with regards to effective collaboration as researchers are located at different locations. Our approach involves three major components: the VIRCOLA data repository, a visualization platform for cross discipline research, and finally a remote collaboration platform to access to visualizations from anywhere. We demonstrated our approach for partner researchers. The result has been promising, as researchers were enthusiastic to apply our approach in their research within the center, and our test demonstrations were encouraging to our partners. It is our aim to adapt our approach on a national scale, i.e. in other large CO2 research projects on the Norwegian shelf.

Place, publisher, year, edition, pages
European Association of Geoscientists and Engineers, EAGE, 2014
National Category
Geophysics
Research subject
Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-32009 (URN)65d17100-f9bc-4faa-ad9a-ef3d13b0f91d (Local ID)9781632665386 (ISBN)65d17100-f9bc-4faa-ad9a-ef3d13b0f91d (Archive number)65d17100-f9bc-4faa-ad9a-ef3d13b0f91d (OAI)
Conference
EAGE CO2 Geological Storage Workshop : Demonstrating Storage Integrity and Building Confidence in CCS 22/04/2014 - 24/04/2014
Note

Godkänd; 2014; 20151104 (samtav)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2022-10-27Bibliographically approved
Bauer, T., Skyttä, P., Tavakoli, S., Hermansson, T., Dehghannejad, M., Juanatey, M. G., . . . Juhlin, C. (2013). A regional scale 3D-model of the Skellefte mining district, northern Sweden (ed.). In: (Ed.), (Ed.), Mineral depostits for a high-tech world: Proceedings of the 12th SGA Biennial Meeting 2013, 12-15 August 2013, Uppsala, Sweden. Paper presented at Biennial SGA Meeting : Mineral deposit research for a high-tech world 12/08/2013 - 15/08/2013 (pp. 62-65). Uppsala: Sveriges Geologiska Undersökning, 1
Open this publication in new window or tab >>A regional scale 3D-model of the Skellefte mining district, northern Sweden
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2013 (English)In: Mineral depostits for a high-tech world: Proceedings of the 12th SGA Biennial Meeting 2013, 12-15 August 2013, Uppsala, Sweden, Uppsala: Sveriges Geologiska Undersökning , 2013, Vol. 1, p. 62-65Conference paper, Meeting abstract (Refereed)
Place, publisher, year, edition, pages
Uppsala: Sveriges Geologiska Undersökning, 2013
National Category
Geology Geophysics
Research subject
Ore Geology; Applied Geophysics
Identifiers
urn:nbn:se:ltu:diva-30861 (URN)4d67f249-01f8-49c7-b669-5f1576d3095d (Local ID)978-91-7403-207-9 (ISBN)4d67f249-01f8-49c7-b669-5f1576d3095d (Archive number)4d67f249-01f8-49c7-b669-5f1576d3095d (OAI)
Conference
Biennial SGA Meeting : Mineral deposit research for a high-tech world 12/08/2013 - 15/08/2013
Note
Godkänd; 2013; 20131106 (tobbau)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2023-09-06Bibliographically approved
Tavakoli, S., Midttømme, K., Hellevang, H. & Braathen, A. (2013). Synergy Between CO2 Storage and Utilization of Geothermal Energy: A case study from Longyearbyen, Svalbard (ed.). Paper presented at GeoEnergi 2013 : 28/08/2013 - 29/08/2013. Paper presented at GeoEnergi 2013 : 28/08/2013 - 29/08/2013.
Open this publication in new window or tab >>Synergy Between CO2 Storage and Utilization of Geothermal Energy: A case study from Longyearbyen, Svalbard
2013 (English)Conference paper, Oral presentation only (Refereed)
National Category
Geophysics
Research subject
Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-28139 (URN)1d4e8253-0b0f-44a6-8554-7c1bbb3bbbcd (Local ID)1d4e8253-0b0f-44a6-8554-7c1bbb3bbbcd (Archive number)1d4e8253-0b0f-44a6-8554-7c1bbb3bbbcd (OAI)
Conference
GeoEnergi 2013 : 28/08/2013 - 29/08/2013
Note
Upprättat; 2013; 20151106 (samtav)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2022-10-27Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0260-5340

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