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Malmmikroskopi, SEM-EDS-  undersökning och framställning  av polerprov från en sektion av  Lovisagruvans sulfidmalm,  Bergslagen
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
2019 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Ore Microscopy, SEM-EDS and Preparation of Polished Samples from a Section of the Lovisagruvan Sulphide Ore, Bergslagen (English)
Abstract [sv]

I detta arbete har polerprov framställts för att därefter undersökas med malm- och svepelektronmikroskopi (SEM) med energidispersiv röntgenspektroskopisk analys (EDS). Med dessa metoder har mineralsammansättning, strukturer och texturer identifierats och undersökts. De undersökta proverna kommer från borrkärnor genom malmzonen i Lovisagruvan i Bergslagen, södra Mellansverige. Malmen är en tabulär, silverförande Zn-Pb-sulfidmineralisering. 

De kombinerade undersökningarna av polerproven visar att de huvudsakligen består av zinkblände, blyglans, kvarts, mikroklin, granat, amfibol och pyrit, vilka karakteriseras av texturer som visar på omkristallisation, heterogen deformation och lokal remobilisering. De uppvisar småskaliga texturer som sannolikt är direkt relaterade till uppkomsten av s.k. kulmalmstextur. De ingående mineralens inbördes relationer tyder på att blyglans och zinkblände bildades samtidigt och därefter, under regionalmetamorfa förhållanden, tillväxte pyrit och granat som porfyroblaster. Majoriteten av texturerna och strukturerna är sekundära och visar på en kraftig senare överprägling av malmen genom metamorfos och flerfasig deformation under olika tryck- och temperaturförhållanden. 

Abstract [en]

In this project polished sections have been prepared for study by means of ore and scanning electron microscopy (SEM) with energy dispersive x-ray spectroscopy (EDS). The application of these methods allows mineralogy, structures and textures to be characterized. This was done within the EU H2020-funded project X-Mine. The studied samples are from drill cores transecting the ore zone of the Lovisa mine (Lovisagruvan), which is located in Örebro County in the Bergslagen ore province, south central Sweden. Here, a tabular, stratiform silver-bearing Zn-Pb sulphide ore is mined. 

Studies of the polished ore sections show that the samples mainly contain sphalerite, galena, quartz, microcline, garnet, amphibole and pyrite, characterized by textures of recrystallisation, heterogeneous deformation and localized remobilization. 

The studied samples from the main ore and exhibit textures directly related to the formation off the so-called ball ore. The textural interrelationships of the major minerals indicate that galena and sphalerite formed penecontemporaneously, and then under regional metamorphic conditions, pyrite and garnet formed as porphyroblasts. The majority of the present textures and structures are secondary, representing different stages of metamorphism and deformation under variable P-T-conditions, post-dating original ore formation. 

Place, publisher, year, edition, pages
2019. , p. 34
Series
Examensarbete vid Institutionen för geovetenskaper, ISSN 1650-6553 ; 2019:1
Keywords [en]
Zn-Pb, sulphide ore, Lovisagruvan, Bergslagen, ore microscopy, SEM-EDS, texture, sphalerite, galena
Keywords [sv]
Zn-Pb, sulfidmalm, Lovisagruvan, Bergslagen, malmmikroskopi, SEM-EDS, textur, zinkblände, blyglans
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-383525OAI: oai:DiVA.org:uu-383525DiVA, id: diva2:1316238
External cooperation
H2020 X-Mine; SGU
Educational program
Bachelor Programme in Earth Science
Supervisors
Examiners
Projects
Real-Time Mineral X-Ray Analysis for Efficient and Sustainable Mining, H2020 X-Mine, Projekt-id: 730270Available from: 2019-05-24 Created: 2019-05-16 Last updated: 2019-05-24Bibliographically approved

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