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Geophysical modelling of the central Skellefte district, Northern Sweden: an integrated model based on the electrical, potential field and petrophysical data
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Geovista AB.
2012 (English)In: Journal of Applied Geophysics, ISSN 0926-9851, E-ISSN 1879-1859, Vol. 82, p. 84-100Article in journal (Refereed) Published
Abstract [en]

The central Skellefte district (CSD) is a part of a major ore-bearing district in northern Sweden. Studying the depth and patterns of the contact relationship between the two major stratigraphic units of the CSD, the Skellefte Group and the Vargfors Group, is a key issue to understand the geometry and structure of the area and to guide exploration of base metals. In this study, we interpret geoelectrical data collected along two profiles and magnetic and gravity data obtained from the database of the Swedish Geological Survey (SGU) and Boliden Mineral, to reveal contact relationship and depth extension of the major geological structures. Petrophysical analyses of the different lithologies were conducted on samples from the database of the SGU. Electric resistivity, induced polarization (IP), magnetic susceptibility and density were determined on 154 core samples representing the different lithologies of the area. The resistivity/IP data were acquired to define structural relations down to a maximum depth of ~ 430 m. The major contact between sediments of the Vargfors basin and volcanic rocks of the Skellefte Group were outlined from the inversion of the resistivity/IP sections, suggesting a synform boundary between the Vargfors Group and Skellefte Group. The contact relationship between the felsic and mafic volcanic rocks of the Skellefte Group is also understood with the help of the resistivity/IP data. The resistivity models were tested using the magnetic data and magnetic susceptibility inferred on the resistivity bodies. The result suggests a good correlation between the initial resistivity model and the magnetic and gravity field calculated from that model. The integration and interpretation of geological and geophysical data improved the basic understanding of the geometry of CSD. Based on previous geological investigations, the potential ore deposits are believed to be found along the volcano-sedimentary contact. The result from this study can thus be used for the base metal exploration, finding the locations of potential sulphide deposits and give a better understanding about spatial relationship between different geology structures in the CSD.

Place, publisher, year, edition, pages
2012. Vol. 82, p. 84-100
Keywords [en]
Earth sciences - Exogenous eart sciences
Keywords [sv]
Geovetenskap - Exogen geovetenskap
National Category
Geophysics
Research subject
Applied Geophysics; Exploration Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-10615DOI: 10.1016/j.jappgeo.2012.02.006ISI: 000305495000009Scopus ID: 2-s2.0-84861527961Local ID: 971ab95d-5992-45da-8eb1-1ee07b605bc4OAI: oai:DiVA.org:ltu-10615DiVA, id: diva2:983560
Note
Validerad; 2012; 20120306 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Tavakoli, SamanElming, Sten-åke

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