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Mineralogy and petrology of a drill core section from Borg, SW Norrköping – fracture fillings and tentative mineral reactions
Stockholm University, Faculty of Science, Department of Geological Sciences.
2019 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

During drilling at Borg, ca. 5 km southwest of central Norrköping, an unidentified fine-grained grey rock was encountered in contact with dark red granitic gneiss at 35m depth. The fine-grained grey rock occurs above the red granitic gneiss. Our understanding prior to testing is that the rock may have been formed by fluid alteration of a mafic rock, as neither metamorphic nor sedimentary textures were observed. Understanding this rock and the formation processes related to it, is of interest for the general understanding of the region and of geotechnical importance since fracture fillings may affect the stability of the rock during and after construction projects. This study uses the methods petrography, XRD and XRF to define the fine-grained mafic rock, black vein in the fine-grained mafic rock, the contact zone and the granitic gneiss. Results show that the fine-grained grey rock has a composition of muscovite (36.1%), quartz (24.6%), albite (20.8%), sericite (10.8) and montmorillonite (0.5%). The contact is mainly made of quartz veins and calcite veins. The protolith of the fine-grained mafic rock is suggested to be iron-rich. Further testing on additional unaltered mafic rock samples from the area would provide a more accurate picture of the protolith evolution.

Place, publisher, year, edition, pages
2019. , p. 30
Keywords [en]
Swedish Transport Administration, mineral reactions, diabas, dolerite, mafic rock, xrd, xrf
Keywords [sv]
Trafikverket, Norrköping, Ostlänken, Bergslagen
National Category
Geology
Identifiers
URN: urn:nbn:se:su:diva-173221OAI: oai:DiVA.org:su-173221DiVA, id: diva2:1351835
External cooperation
Trafikverket
Supervisors
Examiners
Available from: 2019-09-17 Created: 2019-09-16 Last updated: 2019-09-19Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • de-DE
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  • en-US
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  • Other locale
More languages
Output format
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