CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND
Vermiculite is a mineral with many potential uses in various industrial areas, such as in insulation, horticulture, and environmental applications. The regolith of the Sokli carbonatite intrusion in northern Finland consists of weathered micas which reportedly contain vermiculite. The aim of the pre...
Published in: | Clays and Clay Minerals |
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2020
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Online Access: | https://research.abo.fi/en/publications/015215c4-6324-42b2-9458-946ec2aad669 https://doi.org/10.1007/s42860-019-00041-0 https://research.abo.fi/ws/files/27259647/Rama2019_Article_CHARACTERIZATIONOFALTEREDMICAF.pdf https://urn.fi/URN:NBN:fi-fe202201147524 |
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ftaboakademicris:oai:pure.atira.dk:publications/015215c4-6324-42b2-9458-946ec2aad669 2024-04-21T08:08:31+00:00 CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND Rama, Miradje Eklund, Olav Fröjdö, Sören Smått, Jan-Henrik Lastusaari, M. Laiho, T. 2020 application/pdf https://research.abo.fi/en/publications/015215c4-6324-42b2-9458-946ec2aad669 https://doi.org/10.1007/s42860-019-00041-0 https://research.abo.fi/ws/files/27259647/Rama2019_Article_CHARACTERIZATIONOFALTEREDMICAF.pdf https://urn.fi/URN:NBN:fi-fe202201147524 eng eng https://research.abo.fi/en/publications/015215c4-6324-42b2-9458-946ec2aad669 info:eu-repo/semantics/openAccess Rama , M , Eklund , O , Fröjdö , S , Smått , J-H , Lastusaari , M & Laiho , T 2020 , ' CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND ' , Clays and Clay Minerals , vol. 67 , no. 5 , pp. 428–438 . https://doi.org/10.1007/s42860-019-00041-0 article 2020 ftaboakademicris https://doi.org/10.1007/s42860-019-00041-0 2024-03-26T17:54:52Z Vermiculite is a mineral with many potential uses in various industrial areas, such as in insulation, horticulture, and environmental applications. The regolith of the Sokli carbonatite intrusion in northern Finland consists of weathered micas which reportedly contain vermiculite. The aim of the present study was to characterize the weathered mica in order to determine if the weathered regolith contains vermiculite. If so, the value of the apatite-rich Sokli intrusion may increase, because the vermiculite could be classified as an ore in Sokli. For the characterization, mica fractions were investigated using electron probe microanalysis (EPMA), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The EPMA results show that the potassium (K 2 O) content of the mica investigated varies between 6.20 and 0.31 wt.%. The XRD results provided evidence that the interlayer distances in the mica vary between 10.1 and 14.7 Å. The TGA shows that the dehydration of the samples varies between 6 and 12 wt.% for temperatures up to 170°C. Dehydroxylation takes place in three steps, as is characteristic for vermiculite. The results from this study revealed that mica in the weathered parts of the Sokli carbonatite is mostly vermiculite, and that the vermiculite was formed by the weathering of phlogopite. These results can be used to determine whether vermiculite is a possible future commodity at the Sokli carbonatite complex. Article in Journal/Newspaper Northern Finland Åbo Akademi University Research Portal Clays and Clay Minerals 67 5 428 438 |
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Åbo Akademi University Research Portal |
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ftaboakademicris |
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English |
description |
Vermiculite is a mineral with many potential uses in various industrial areas, such as in insulation, horticulture, and environmental applications. The regolith of the Sokli carbonatite intrusion in northern Finland consists of weathered micas which reportedly contain vermiculite. The aim of the present study was to characterize the weathered mica in order to determine if the weathered regolith contains vermiculite. If so, the value of the apatite-rich Sokli intrusion may increase, because the vermiculite could be classified as an ore in Sokli. For the characterization, mica fractions were investigated using electron probe microanalysis (EPMA), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The EPMA results show that the potassium (K 2 O) content of the mica investigated varies between 6.20 and 0.31 wt.%. The XRD results provided evidence that the interlayer distances in the mica vary between 10.1 and 14.7 Å. The TGA shows that the dehydration of the samples varies between 6 and 12 wt.% for temperatures up to 170°C. Dehydroxylation takes place in three steps, as is characteristic for vermiculite. The results from this study revealed that mica in the weathered parts of the Sokli carbonatite is mostly vermiculite, and that the vermiculite was formed by the weathering of phlogopite. These results can be used to determine whether vermiculite is a possible future commodity at the Sokli carbonatite complex. |
format |
Article in Journal/Newspaper |
author |
Rama, Miradje Eklund, Olav Fröjdö, Sören Smått, Jan-Henrik Lastusaari, M. Laiho, T. |
spellingShingle |
Rama, Miradje Eklund, Olav Fröjdö, Sören Smått, Jan-Henrik Lastusaari, M. Laiho, T. CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND |
author_facet |
Rama, Miradje Eklund, Olav Fröjdö, Sören Smått, Jan-Henrik Lastusaari, M. Laiho, T. |
author_sort |
Rama, Miradje |
title |
CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND |
title_short |
CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND |
title_full |
CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND |
title_fullStr |
CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND |
title_full_unstemmed |
CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND |
title_sort |
characterization of altered mica from sokli, northern finland |
publishDate |
2020 |
url |
https://research.abo.fi/en/publications/015215c4-6324-42b2-9458-946ec2aad669 https://doi.org/10.1007/s42860-019-00041-0 https://research.abo.fi/ws/files/27259647/Rama2019_Article_CHARACTERIZATIONOFALTEREDMICAF.pdf https://urn.fi/URN:NBN:fi-fe202201147524 |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
Rama , M , Eklund , O , Fröjdö , S , Smått , J-H , Lastusaari , M & Laiho , T 2020 , ' CHARACTERIZATION OF ALTERED MICA FROM SOKLI, NORTHERN FINLAND ' , Clays and Clay Minerals , vol. 67 , no. 5 , pp. 428–438 . https://doi.org/10.1007/s42860-019-00041-0 |
op_relation |
https://research.abo.fi/en/publications/015215c4-6324-42b2-9458-946ec2aad669 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s42860-019-00041-0 |
container_title |
Clays and Clay Minerals |
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67 |
container_issue |
5 |
container_start_page |
428 |
op_container_end_page |
438 |
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1796948874586226688 |