Data mining of petrophysical and lithogeochemical borehole data to elucidate the origin of seismic reflectivity within the Kevitsa Ni-Cu-PGE bearing intrusion, northern Finland
The Kevitsa mafic-ultramafic intrusion, located within the Central Lapland Greenstone Belt in northern Finland, hosts a large, disseminated Ni-Cu-PGE sulphide deposit. A three-dimensional seismic reflection survey was conducted over the Kevitsa intrusion in 2010 primarily for open-pit mine planning...
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Uppsala universitet, Geofysik
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ftuppsalauniv:oai:DiVA.org:uu-406199 2023-05-15T17:42:20+02:00 Data mining of petrophysical and lithogeochemical borehole data to elucidate the origin of seismic reflectivity within the Kevitsa Ni-Cu-PGE bearing intrusion, northern Finland Junno, N. Koivisto, E. Kukkonen, I Malehmir, Alireza Wijns, C. Montonen, M. 2020 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-406199 https://doi.org/10.1111/1365-2478.12907 eng eng Uppsala universitet, Geofysik Univ Helsinki, Dept Geosci & Geog, POB 68, FI-00014 Helsinki, Finland First Quantum Minerals Ltd, Perth, WA 6005, Australia Boliden FinnEx Oy, Kevitsa, Finland WILEY Geophysical Prospecting, 0016-8025, 2020, 68:1, s. 82-102 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-406199 doi:10.1111/1365-2478.12907 ISI:000505379700006 info:eu-repo/semantics/openAccess Borehole geophysics Petrophysics Seismics Interpretation Geophysics Geofysik Article in journal info:eu-repo/semantics/article text 2020 ftuppsalauniv https://doi.org/10.1111/1365-2478.12907 2023-02-23T21:51:47Z The Kevitsa mafic-ultramafic intrusion, located within the Central Lapland Greenstone Belt in northern Finland, hosts a large, disseminated Ni-Cu-PGE sulphide deposit. A three-dimensional seismic reflection survey was conducted over the Kevitsa intrusion in 2010 primarily for open-pit mine planning and for deep mineral exploration purposes. In the Kevitsa three-dimensional seismic data, laterally continuous reflections are observed within a constrained region within the intrusion. In earlier studies, it has been suggested that this internal reflectivity mainly originates from contacts between the tops and more sulphide-rich bottoms of smaller scale, internally differentiated magma layers that represent a spectrum of olivine pyroxenites. However, this interpretation is not unequivocally supported by the borehole data. In this study, data mining, namely the Self-Organizing Map analysis, of extensive Kevitsa borehole data is used to investigate the possible causes for the observed internal reflectivity within the Kevitsa intrusion. Modelling of the effect of mineralization and alteration on the reflectivity properties of Kevitsa rock types, based on average modal compositions of the rock types, is presented to support the results of the Self-Organizing Map analysis. Based on the results, we suggest that the seismic reflectivity observed within the Kevitsa intrusion can possibly be attributed to alteration, and may also be linked to the presence of sulphide minerals. Article in Journal/Newspaper Northern Finland Lapland Uppsala University: Publications (DiVA) Geophysical Prospecting 68 1 82 102 |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Borehole geophysics Petrophysics Seismics Interpretation Geophysics Geofysik |
spellingShingle |
Borehole geophysics Petrophysics Seismics Interpretation Geophysics Geofysik Junno, N. Koivisto, E. Kukkonen, I Malehmir, Alireza Wijns, C. Montonen, M. Data mining of petrophysical and lithogeochemical borehole data to elucidate the origin of seismic reflectivity within the Kevitsa Ni-Cu-PGE bearing intrusion, northern Finland |
topic_facet |
Borehole geophysics Petrophysics Seismics Interpretation Geophysics Geofysik |
description |
The Kevitsa mafic-ultramafic intrusion, located within the Central Lapland Greenstone Belt in northern Finland, hosts a large, disseminated Ni-Cu-PGE sulphide deposit. A three-dimensional seismic reflection survey was conducted over the Kevitsa intrusion in 2010 primarily for open-pit mine planning and for deep mineral exploration purposes. In the Kevitsa three-dimensional seismic data, laterally continuous reflections are observed within a constrained region within the intrusion. In earlier studies, it has been suggested that this internal reflectivity mainly originates from contacts between the tops and more sulphide-rich bottoms of smaller scale, internally differentiated magma layers that represent a spectrum of olivine pyroxenites. However, this interpretation is not unequivocally supported by the borehole data. In this study, data mining, namely the Self-Organizing Map analysis, of extensive Kevitsa borehole data is used to investigate the possible causes for the observed internal reflectivity within the Kevitsa intrusion. Modelling of the effect of mineralization and alteration on the reflectivity properties of Kevitsa rock types, based on average modal compositions of the rock types, is presented to support the results of the Self-Organizing Map analysis. Based on the results, we suggest that the seismic reflectivity observed within the Kevitsa intrusion can possibly be attributed to alteration, and may also be linked to the presence of sulphide minerals. |
format |
Article in Journal/Newspaper |
author |
Junno, N. Koivisto, E. Kukkonen, I Malehmir, Alireza Wijns, C. Montonen, M. |
author_facet |
Junno, N. Koivisto, E. Kukkonen, I Malehmir, Alireza Wijns, C. Montonen, M. |
author_sort |
Junno, N. |
title |
Data mining of petrophysical and lithogeochemical borehole data to elucidate the origin of seismic reflectivity within the Kevitsa Ni-Cu-PGE bearing intrusion, northern Finland |
title_short |
Data mining of petrophysical and lithogeochemical borehole data to elucidate the origin of seismic reflectivity within the Kevitsa Ni-Cu-PGE bearing intrusion, northern Finland |
title_full |
Data mining of petrophysical and lithogeochemical borehole data to elucidate the origin of seismic reflectivity within the Kevitsa Ni-Cu-PGE bearing intrusion, northern Finland |
title_fullStr |
Data mining of petrophysical and lithogeochemical borehole data to elucidate the origin of seismic reflectivity within the Kevitsa Ni-Cu-PGE bearing intrusion, northern Finland |
title_full_unstemmed |
Data mining of petrophysical and lithogeochemical borehole data to elucidate the origin of seismic reflectivity within the Kevitsa Ni-Cu-PGE bearing intrusion, northern Finland |
title_sort |
data mining of petrophysical and lithogeochemical borehole data to elucidate the origin of seismic reflectivity within the kevitsa ni-cu-pge bearing intrusion, northern finland |
publisher |
Uppsala universitet, Geofysik |
publishDate |
2020 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-406199 https://doi.org/10.1111/1365-2478.12907 |
genre |
Northern Finland Lapland |
genre_facet |
Northern Finland Lapland |
op_relation |
Geophysical Prospecting, 0016-8025, 2020, 68:1, s. 82-102 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-406199 doi:10.1111/1365-2478.12907 ISI:000505379700006 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/1365-2478.12907 |
container_title |
Geophysical Prospecting |
container_volume |
68 |
container_issue |
1 |
container_start_page |
82 |
op_container_end_page |
102 |
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1766144175892332544 |