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Geophysical investigation of the Arvidsjaur volcanics and the Archean-Proterozoic boundary
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this work the magnetic and magnetotelluric (MT) geophysical methods have been used to produce two 3D models for the Laver area in southern Norrbotten. A new discovery of a porphyry copper deposit located at the Lill-Laverberget was reported by Boliden in 2012. The goal with the models is to form a better understanding of the setting for the porphyry deposit and to see if any of the geophysical methods are suited to be used in exploration for it. For starters an edge detector (Beiki, 2010) was used on magnetic data to identify structures and petrological contacts in the area. The magnetic data was modelled using the SimPEG (Cocket, et al., 2015) inversion software to create a 3D model over the area. The Magnetic method quite clearly managed to resolve the volcanic units in the Laver area. MT data was collected during fieldwork in September of 2018 and modelled using the MOD3DEM (Egbert & Kelbert, 2012) inversion software. The MT model did not show any clear anomalies that could be related to the deposit.

Abstract [sv]

I detta arbete så har de magnetiska och magnetotelluriska (MT) geofysiska metoderna används för att skapa två 3D modeller över Laverområdet i södra Norrbotten. I området finns en porfyrkopparfyndighet som Boliden rapporterade in 2012. Målet med båda modellerna är att fördjupa förståelsen för bildningsmiljön för fyndigheten och för att se hur lämpade de geofysiska metoderna är för prospektering. Det första steget var att använda befintliga magnetiska data och processa den med ED funktionen (Beiki, 2010) för att identifiera strukturer och bergartskontakter i området. Den magnetiska data användes för att producera en 3D modell med inversionsprogrammet SimPEG (Cocket, et al., 2015). Denna modell kunde skilja mellan vulkaniska och övriga bergarter i området. Magnetotelluriska data samlades in i september 2018 och modellerades med MOD3DEM (Egbert & Kelbert, 2012), denna modell hade dock problem att finna anomalier i området.

Place, publisher, year, edition, pages
2019. , p. 63
Keywords [en]
Laver SimPEG MT Magnetotelluric Magnetic Inversion
National Category
Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-72632OAI: oai:DiVA.org:ltu-72632DiVA, id: diva2:1280763
Subject / course
Student thesis, at least 30 credits
Educational program
Natural Resources Engineering, master's
Presentation
2018-12-07, F436, Luleå, 08:30 (English)
Supervisors
Examiners
Available from: 2019-03-20 Created: 2019-01-21 Last updated: 2019-03-20Bibliographically approved

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
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Output format
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