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First-arrival traveltime tomography of active-source data in the Kansanshi copper mine, northern Zambia
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
2019 (English)Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesisAlternative title
Seismisk tomografi baserad på ankomsttider av de först anländande vågorna från aktiva källor i Kansanshi koppargruva, norra Zambia (Swedish)
Abstract [en]

Sedimentary rock-hosted deposits are a major source of copper and cobalt, with the Neoproterozoic central African Copperbelt being among the largest Cu-Co provinces in the world, accounting for around 15% of its copper resource. The deposits occur primarily in the carbonates and siliciclastic sediments overlying the basement, and formed during early diagenesis (around 820 Ma) and late diagenesis/metamorphism during the Pan-African Orogeny (580-520 Ma). The northwest province of Zambia hosts three major copper deposits, amongst which is Kansanshi: the focus of this study. The deposit, which lies north of the Solwezi dome, is hosted within the Katangan Supergroup, particularly within the carbonaceous phyllites and porphyroblastic schists of the Mshwaya subgroup and lower Nguba Group and extends along the strike length of the North-West trending Kansanshi antiform. In this study, tomographic inversion is applied to first arrival refraction data collected at the Kansanshi Copper Mine with the aim of locating potential copper-bearing structures. 

The survey was carried out using both dynamite and VIBSIST sources along 3 profiles; 2 trending North-East across the Kansanshi anticline and 1 trending north-west parallel to it. Seismic refraction tomography is an excellent tool for investigating the shallow subsurface, providing a velocity distribution. Unlike conventional refraction seismics, it allows for the velocity calculation of each cell in a non-homogeneous earth model, rather than just the average velocity of individual layers - allowing us to map structure and infer geological units and weathering profiles. The data highlights abundant faulting and varying depth to fresh bedrock. The various lithologies have also been interpreted.

Place, publisher, year, edition, pages
2019. , p. 29
Series
Examensarbete vid Institutionen för geovetenskaper, ISSN 1650-6553 ; 474
Keywords [en]
refraction seismics, tomographic inversion, Zambian Copperbelt, copper
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-398370OAI: oai:DiVA.org:uu-398370DiVA, id: diva2:1375544
Educational program
Master Programme in Physics
Presentation
2019-12-05, Dk235, Geocentrum, Uppsala, 10:00 (English)
Supervisors
Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2019-12-05Bibliographically approved

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