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Predicting Missing Seismic Velocity Values Using Self-Organizing Maps to Aid the Interpretation of Seismic Reflection Data from the Kevitsa Ni-Cu-PGE Deposit in Northern Finland
Univ Helsinki, Dept Geosci & Geog, POB 68, FIN-00014 Helsinki, Finland.
Univ Helsinki, Dept Geosci & Geog, POB 68, FIN-00014 Helsinki, Finland.ORCID iD: 0000-0002-1485-6307
Univ Helsinki, Dept Geosci & Geog, POB 68, FIN-00014 Helsinki, Finland.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0003-1241-2988
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2019 (English)In: Minerals, ISSN 2075-163X, E-ISSN 2075-163X, Vol. 9, no 9, article id 529Article in journal (Refereed) Published
Abstract [en]

We use self-organizing map (SOM) analysis to predict missing seismic velocity values from other available borehole data. The site of this study is the Kevitsa Ni-Cu-PGE deposit within the mafic-ultramafic Kevitsa intrusion in northern Finland. The site has been the target of extensive seismic reflection surveys, which have revealed a series of reflections beneath the Kevitsa resource area. The interpretation of these reflections has been complicated by disparate borehole data, particularly because of the scarce amount of available sonic borehole logs and the varying practices in logging of borehole lithologies. SOM is an unsupervised data mining method based on vector quantization. In this study, SOM is used to predict missing seismic velocities from other geophysical, geochemical, geological, and geotechnical data. For test boreholes, for which measured seismic velocity logs are also available, the correlation between actual measured and predicted velocities is strong to moderate, depending on the parameters included in the SOM analysis. Predicted reflectivity logs, based on measured densities and predicted velocities, show that some contacts between olivine pyroxenite/olivine websterite-dominant host rocks of the Kevitsa disseminated sulfide mineralization-and metaperidotite-earlier extensively used "lithology" label that essentially describes various degrees of alteration of different olivine pyroxenite variants-are reflective, and thus, alteration can potentially cause reflectivity within the Kevitsa intrusion.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 9, article id 529
Keywords [en]
self-organizing map, missing data, geophysical borehole data, seismic interpretation
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-395855DOI: 10.3390/min9090529ISI: 000488032600017OAI: oai:DiVA.org:uu-395855DiVA, id: diva2:1365469
Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved

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