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Re-processing and interpretation of 2D seismic data from the Kristineberg mining area, northern Sweden
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.
2012 (English)In: Journal of Applied Geophysics, ISSN 0926-9851, Vol. 80, 43-55 p.Article in journal (Refereed) Published
Abstract [en]

The Kristineberg mining area in the western part of the Skellefte ore district, northern Sweden, contains the largest massive sulphide deposit in the district. In 2003, two parallel seismic lines, Profiles 1 and 5, each about 25 km long and about 8 km apart were acquired in the Kristineberg area. The initial processing results were successful in imaging the large-scale structures of the area down to 12 km of the crust, but resulted in relatively poor seismic image near the mine. In this paper, we re-processed the seismic data along Profile 1 that crosses the mine. The main objective was to improve the seismic section near the mine for further correlation with new seismic data recently acquired in the area. The crooked-line acquisition geometry, very low fold coverage of less than 17, complex geology and sparse outcrops in the area made the data re-processing and interpretation challenging. Despite these challenges, significant improvement is observed in the seismic data, in terms of event continuity and resolution. Refraction static corrections allowed high frequencies to be retained, which improved the seismic section. The refraction static solution was manually checked and adjusted at every iteration to avoid unstable solutions. 3D visualization of the re-processed data with other seismic profiles recently acquired in the area allowed the seismic reflections to be correlated. The majority of the reflections are interpreted to originate from either fault zones or lithological contacts. A very shallow reflection correlates well with the location of the Kristineberg mineralized horizon.

Place, publisher, year, edition, pages
2012. Vol. 80, 43-55 p.
Keyword [en]
Hardrock seismic, Mineral deposits, Re-processing, Refraction statics
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-174358DOI: 10.1016/j.jappgeo.2012.01.004ISI: 000302975000005OAI: oai:DiVA.org:uu-174358DiVA: diva2:528128
Available from: 2012-05-24 Created: 2012-05-15 Last updated: 2014-06-30Bibliographically approved
In thesis
1. Reflection seismic investigation in the Skellefte ore district: A basis for 3D/4D geological modeling
Open this publication in new window or tab >>Reflection seismic investigation in the Skellefte ore district: A basis for 3D/4D geological modeling
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Skellefte ore district in northern Sweden is a Palaeoproterozoic volcanic arc and one of the most important ones hosting volcanogenic massive sulfide (VMS) deposits, producing mainly base metals and orogenic gold deposits. Due to high metal prices and increased difficulties in finding shallow deposits, the exploration for and exploitation of mineral resources is quickly being moved to greater depths. For this reason, a better understanding of the geological structures in 3D down to a few kilometers depth is required as a tool for ore targeting. As exploration and mining go deeper, it becomes more and more evident why a good understanding of geology in 3D at exploration depths, and even greater, is important to optimize both exploration and mining.

Following a successful pilot 3D geological modeling project in the western part of the district, the Kristineberg mining area, a new project "VINNOVA 4D modeling of the Skellefte district" was launched in 2008, with the aim of improving the existing models, especially at shallow depth and extending the models to the central district. More than 100 km of reflection seismic (crooked) profiles were acquired, processed and interpreted in conjunction with geological observations and potential field data. Results were used to constrain the 3D geological model of the study area and provided new insights about the geology and mineral potential at depth.

Results along the seismic profiles in the Kristineberg mining area proved the capability of the method for imaging reflections associated with mineralization zones in the area, and we could suggest that the Kristineberg mineralization and associated structures dip to the south down to at least a depth of about 2 km. In the central Skellefte area, we were able to correlate main reflections and diffractions with the major faults and shear zones. Cross-dip analysis, reflection modeling, pre-stack time migration, swath 3D processing and finite-difference seismic modeling allowed insights about the origin of some of the observed reflections and in defining the imaging challenges in the associated geological environments.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. 68 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1143
Skellefte district, reflection seismic, mineral exploration, 3D/4D modeling, mineralization, faults and shear zones
National Category
Research subject
Geophysics with specialization in Solid Earth Physics
urn:nbn:se:uu:diva-221225 (URN)978-91-554-8937-3 (ISBN)
Public defence
2014-06-05, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00 (English)
VINNOVA 4D modeling of the Skellefte district
Available from: 2014-05-14 Created: 2014-03-26 Last updated: 2014-06-30

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