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MT measurements in the western part of the Paleoproterozoic Skellefte Ore District, Northern Sweden: a contribution to an integrated geophysical study
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Oulu University, Finland.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
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2009 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 475, no 3-4, 493-502 p.Article in journal (Refereed) Published
Abstract [en]

A 2D conductivity model of the Kristineberg area in the Skellefte Ore District, Northern Sweden, has been derived from new magnetotelluric measurements. This complements an intensive geophysical and geological study of the area, including reflection seismics, gravity and aeromagnetic data modeling as well as geological field observations. In a pilot study, 20 broadband MT stations were installed in May 2007 along a 20 km long north–south profile. Dimensionality analysis shows that a 2D interpretation of the data is justified, although the presumed geoelectric strike direction of N75°E is not consistent over the whole profile. The new conductivity model of the upper crust agrees well with the results from the seismic studies. Interpreting both independent data sets confirms the major features from the previous model, such as the thickness of the Revsund granites in the south, the existence of a structural basement with metasedimentary origin, and gives new insight into the nature of the volcanic rocks and their possible mineral content.

Place, publisher, year, edition, pages
Elsevier , 2009. Vol. 475, no 3-4, 493-502 p.
Keyword [en]
Magnetotellurics, Skellefte Ore District, Structural basement, Seismic reflection, Revsund granite
National Category
Earth and Related Environmental Sciences Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-114503DOI: 10.1016/j.tecto.2009.06.011ISI: 000273524100007OAI: oai:DiVA.org:uu-114503DiVA: diva2:294273
Available from: 2010-02-16 Created: 2010-02-16 Last updated: 2013-04-23Bibliographically approved
In thesis
1. From 2D to 3D Models of Electrical Conductivity based upon Magnetotelluric Data: Experiences from two Case Studies
Open this publication in new window or tab >>From 2D to 3D Models of Electrical Conductivity based upon Magnetotelluric Data: Experiences from two Case Studies
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Magnetotelluric measurements are among the few geophysical techniques capable of imaging the structure both in the shallow subsurface as well as the entire crust of the Earth. With recent technical and computational advances it has become possible to derive three-dimensional inversion models of the electrical conductivity from magnetotelluric data, thereby overcoming the problems arising from the simplified assumption of two-dimensionality in conventional two-dimensional modeling. The transition from two-dimensional to three-dimensional analysis requires careful reconsideration of the classical challenges of magnetotellurics: galvanic distortion, data errors, model discretization and resolution.This work presents two examples of magnetotelluric investigations, where a new three-dimensional inversion algorithm has been applied. The new models are compared with conventional two-dimensional models and combined with the results of other geophysical techniques like reflection seismics and electrical resistivity tomography. The first case presents magnetotelluric investigations of the Kristineberg mining area in the Skellefte district, northern Sweden. This study is part of a joint geophysical and geological project to investigate the present structure and evolution of the whole district. Together with reflection seismic and surface geological information a three-dimensional conductivity model, derived through the inversion of magnetotelluric data, was interpreted. A comparison with two-dimensional modeling gives insights into the capabilities and challenges of three-dimensional inversion strategies with respect to data sampling and model resolution.The second case presents a study of remediation monitoring  with geophysical methods after an oil blow-out in Trecate, Italy. A three-dimensional conductivity model was derived from radiomagnetotelluric measurements. In addition, two-dimensional joint inversion of radiomagnetotelluric and electrical tomography data was performed. Compared with electrical resistivity tomography, radiomagnetotelluric data is more sensitive to conductors and the derived three-dimensional inversion model resolves the vadose zone and the underlying aquifer.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 58 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 890
National Category
Geophysics
Identifiers
urn:nbn:se:uu:diva-165143 (URN)
Public defence
2012-02-17, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00 (English)
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Supervisors
Available from: 2012-01-27 Created: 2012-01-03 Last updated: 2012-02-15Bibliographically approved

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Hübert, JulianeMalehmir, AlirezaTryggvason, AriPedersen, Laust B.

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