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...
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ftunivturku:oai:www.utupub.fi:10024/159035 2023-05-15T17:42:17+02:00 Characterization of altered mica from Sokli, northern Finland Eklund Olav Fröjdö S Laiho Taina Lastusaari Mika Rama Miradije Smått J.-H. kestävän kehityksen materiaalien kemia, Kestävän kehityksen materiaalien kemia materiaalitutkimuksen laboratorio, Materials Research Laboratory 2606302 2606706 2022-10-28T12:20:22Z 428 438 https://www.utupub.fi/handle/10024/159035 en eng Springer Switzerland Sveitsi CH 67 10.1007/s42860-019-00041-0 Clays and Clay Minerals 5 https://www.utupub.fi/handle/10024/159035 URN:NBN:fi-fe2021042824137 1552-8367 0009-8604 2022 ftunivturku 2022-11-30T23:59:50Z 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. Other/Unknown Material Northern Finland University of Turku: UTUPub |
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University of Turku: UTUPub |
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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. |
author2 |
kestävän kehityksen materiaalien kemia, Kestävän kehityksen materiaalien kemia materiaalitutkimuksen laboratorio, Materials Research Laboratory 2606302 2606706 |
author |
Eklund Olav Fröjdö S Laiho Taina Lastusaari Mika Rama Miradije Smått J.-H. |
spellingShingle |
Eklund Olav Fröjdö S Laiho Taina Lastusaari Mika Rama Miradije Smått J.-H. Characterization of altered mica from Sokli, northern Finland |
author_facet |
Eklund Olav Fröjdö S Laiho Taina Lastusaari Mika Rama Miradije Smått J.-H. |
author_sort |
Eklund Olav |
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 |
publisher |
Springer |
publishDate |
2022 |
url |
https://www.utupub.fi/handle/10024/159035 |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_relation |
67 10.1007/s42860-019-00041-0 Clays and Clay Minerals 5 https://www.utupub.fi/handle/10024/159035 URN:NBN:fi-fe2021042824137 1552-8367 0009-8604 |
_version_ |
1766144128452657152 |