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
ABSTRACT 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...
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crwiley:10.1111/1365-2478.12907 2024-09-30T14:40:05+00:00 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, A. Wijns, C. Montonen, M. 2019 http://dx.doi.org/10.1111/1365-2478.12907 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2478.12907 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2478.12907 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2478.12907 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Geophysical Prospecting volume 68, issue 1, page 82-102 ISSN 0016-8025 1365-2478 journal-article 2019 crwiley https://doi.org/10.1111/1365-2478.12907 2024-09-03T04:24:11Z ABSTRACT 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 Wiley Online Library Geophysical Prospecting 68 1 82 102 |
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English |
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ABSTRACT 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, A. Wijns, C. Montonen, M. |
spellingShingle |
Junno, N. Koivisto, E. Kukkonen, I. Malehmir, A. 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 |
author_facet |
Junno, N. Koivisto, E. Kukkonen, I. Malehmir, A. 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 |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1111/1365-2478.12907 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2478.12907 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2478.12907 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2478.12907 |
genre |
Northern Finland Lapland |
genre_facet |
Northern Finland Lapland |
op_source |
Geophysical Prospecting volume 68, issue 1, page 82-102 ISSN 0016-8025 1365-2478 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/1365-2478.12907 |
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Geophysical Prospecting |
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68 |
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1 |
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82 |
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102 |
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1811642633106227200 |