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Seismic imaging in the Skellefte ore district, northern Sweden
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2005 (English)In: 20th World Mining Congress, November 7-11, 2005, Tehran, Iran: mining and sustainable development, Teheran: Geological Survey of Iran , 2005, p. 399-404Conference paper, Published paper (Refereed)
Abstract [en]

In the western part of the Skellefte ore district, which is the most important metallogenic zone in Northern Sweden, several world class mines, e.g., the Kristineberg VMS mine (20.1mt, Cu-Zn-Pb-Ag-Au) are situated. In order to understand why these deposits occur where they do, it is important to understand the crustal architecture of the region. One way to understand the contact relationships between the ore bearing volcanic formations and the surrounding rocks is to develop a detailed 3-D geological model of the region. To establish the structural geologic framework at depth, new seismic reflection data were acquired along two profiles in the Kristineberg area in late August and early September 2003. Data along the two seismic profiles (Profile 1 and Profile 5), each about 25 km long and running in parallel, were collected with the purpose of obtaining high resolution images of the top 10 km of the crust. Although the structural geology is very complex, preliminary stacked sections of the data have revealed numerous reflections which can be correlated with surface geology. Results along Profile 1, which passes on top of the Kristineberg mine show the mine to be located in a major synform extending down to about 2.5-3 km depth. The structure and stratigraphy of the Kristineberg area have been debated for many years. Our seismic results suggest that the deposits occur on the northern limb of a regional syncline. The results help to identify new prospective areas, both down-plunge from known ores, and on the southern limb of the ore-bearing syncline. The results for Profile 5 show that the Revsund granite can have a thickness about 3-3.5 km but not more. Ultramafic rocks are imaged clearly. Diffraction patterns can be interpreted as orienting from either a mafic-ultramafic intrusion or a mineralization zone. A detailed study has to be done in order to determine the source of this reflectivity. In this study seismic reflection profiling has been particularly effective for imaging the major structures around the ore body, demonstrating that the seismic-reflection technique can be used for delineating complex structures that are significant in mineral exploration.

Place, publisher, year, edition, pages
Teheran: Geological Survey of Iran , 2005. p. 399-404
National Category
Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:ltu:diva-27871Local ID: 170debc0-5164-11dc-959a-000ea68e967bOAI: oai:DiVA.org:ltu-27871DiVA, id: diva2:1001062
Conference
World Mining Congress : 07/11/2005 - 11/11/2005
Note
Godkänd; 2005; 20070823 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-15Bibliographically approved

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Weihed, Pär

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