Mineral magnetic properties of granodiorite, metagabbro and microgabbro of Petermann Island, West Antarctica
The research focuses on studying the magnetic properties and mineralogy of iron-bearing minerals of granodiorite, metagabbro, and microgabbro of Petermann Island, West Antarctica. The predominant iron-bearing minerals of the rocks are ilmenite, magnetite, and iron sulphides. Magnetite in metagabbro...
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ftmasarykunivojs:oai:ojs.journals.muni.cz:article/12918 2023-05-15T13:46:41+02:00 Mineral magnetic properties of granodiorite, metagabbro and microgabbro of Petermann Island, West Antarctica Ponomar, Vitalii Pavlovych Gavryliv, Liubomyr Igorovych 2018-01-01 application/pdf http://journals.muni.cz/CPR/article/view/12918 eng eng Masaryk Univerzity http://journals.muni.cz/CPR/article/view/12918/11270 http://journals.muni.cz/CPR/article/view/12918 Copyright (c) 2020 Czech Polar Reports https://creativecommons.org/licenses/by-nc-nd/4.0 CC-BY-NC-ND Czech Polar Reports; Vol 8 No 1 (2018); 94-106 Czech Polar Reports; Vol. 8 No. 1 (2018); 94-106 1805-0697 1805-0689 Graham Land rock magnetic properties magnetite thermomagnetic analysis info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2018 ftmasarykunivojs 2022-06-26T10:16:39Z The research focuses on studying the magnetic properties and mineralogy of iron-bearing minerals of granodiorite, metagabbro, and microgabbro of Petermann Island, West Antarctica. The predominant iron-bearing minerals of the rocks are ilmenite, magnetite, and iron sulphides. Magnetite in metagabbro and microgabbro is pointed out to be present as two morphological types with different grain size and morphology. The rocks owe their magnetic properties to the presence of different amounts of magnetite with the Curie temperatures of 570–575°C for granodiorite, 555–560°C for metagabbro and 560–565°C for microgabbro. Magnetite in the rocks is stable under heating to 650°C. A slight decrease in magnetisation at 350–400°C is attributed to the conversion of maghemite or maghemite-like phase into hematite. Variation of the magnetite content within each sample has a strong expression in the saturation magnetisation. The latter increases in sequence: granodiorite (0.8–1.3 Am2/kg), microgabbro (1.8–3 Am2/kg) and metagabbro (3.1–3.5 Am2/kg). The saturation magnetisation of rocks increases with the increasing content of iron. However, the inverse relation is observed for metagabbro and microgabbro due to the replacement of titanite for magnetite in the latter. The magnetic fraction of microgabbro reveals the wasp-waisted hysteresis loop suggesting bimodal size distribution. According to X-Ray Diffraction, the characteristic peaks (d-spacing) of pure magnetite are identified for magnetic fraction of granodiorite and metagabbro, while magnetite of microgabbro form stable intergrowth with titanite and chlorite. Article in Journal/Newspaper Antarc* Antarctica Graham Land Petermann Island West Antarctica Masaryk University Journals West Antarctica Graham Land ENVELOPE(-63.500,-63.500,-66.000,-66.000) Petermann Island ENVELOPE(-64.142,-64.142,-65.172,-65.172) |
institution |
Open Polar |
collection |
Masaryk University Journals |
op_collection_id |
ftmasarykunivojs |
language |
English |
topic |
Graham Land rock magnetic properties magnetite thermomagnetic analysis |
spellingShingle |
Graham Land rock magnetic properties magnetite thermomagnetic analysis Ponomar, Vitalii Pavlovych Gavryliv, Liubomyr Igorovych Mineral magnetic properties of granodiorite, metagabbro and microgabbro of Petermann Island, West Antarctica |
topic_facet |
Graham Land rock magnetic properties magnetite thermomagnetic analysis |
description |
The research focuses on studying the magnetic properties and mineralogy of iron-bearing minerals of granodiorite, metagabbro, and microgabbro of Petermann Island, West Antarctica. The predominant iron-bearing minerals of the rocks are ilmenite, magnetite, and iron sulphides. Magnetite in metagabbro and microgabbro is pointed out to be present as two morphological types with different grain size and morphology. The rocks owe their magnetic properties to the presence of different amounts of magnetite with the Curie temperatures of 570–575°C for granodiorite, 555–560°C for metagabbro and 560–565°C for microgabbro. Magnetite in the rocks is stable under heating to 650°C. A slight decrease in magnetisation at 350–400°C is attributed to the conversion of maghemite or maghemite-like phase into hematite. Variation of the magnetite content within each sample has a strong expression in the saturation magnetisation. The latter increases in sequence: granodiorite (0.8–1.3 Am2/kg), microgabbro (1.8–3 Am2/kg) and metagabbro (3.1–3.5 Am2/kg). The saturation magnetisation of rocks increases with the increasing content of iron. However, the inverse relation is observed for metagabbro and microgabbro due to the replacement of titanite for magnetite in the latter. The magnetic fraction of microgabbro reveals the wasp-waisted hysteresis loop suggesting bimodal size distribution. According to X-Ray Diffraction, the characteristic peaks (d-spacing) of pure magnetite are identified for magnetic fraction of granodiorite and metagabbro, while magnetite of microgabbro form stable intergrowth with titanite and chlorite. |
format |
Article in Journal/Newspaper |
author |
Ponomar, Vitalii Pavlovych Gavryliv, Liubomyr Igorovych |
author_facet |
Ponomar, Vitalii Pavlovych Gavryliv, Liubomyr Igorovych |
author_sort |
Ponomar, Vitalii Pavlovych |
title |
Mineral magnetic properties of granodiorite, metagabbro and microgabbro of Petermann Island, West Antarctica |
title_short |
Mineral magnetic properties of granodiorite, metagabbro and microgabbro of Petermann Island, West Antarctica |
title_full |
Mineral magnetic properties of granodiorite, metagabbro and microgabbro of Petermann Island, West Antarctica |
title_fullStr |
Mineral magnetic properties of granodiorite, metagabbro and microgabbro of Petermann Island, West Antarctica |
title_full_unstemmed |
Mineral magnetic properties of granodiorite, metagabbro and microgabbro of Petermann Island, West Antarctica |
title_sort |
mineral magnetic properties of granodiorite, metagabbro and microgabbro of petermann island, west antarctica |
publisher |
Masaryk Univerzity |
publishDate |
2018 |
url |
http://journals.muni.cz/CPR/article/view/12918 |
long_lat |
ENVELOPE(-63.500,-63.500,-66.000,-66.000) ENVELOPE(-64.142,-64.142,-65.172,-65.172) |
geographic |
West Antarctica Graham Land Petermann Island |
geographic_facet |
West Antarctica Graham Land Petermann Island |
genre |
Antarc* Antarctica Graham Land Petermann Island West Antarctica |
genre_facet |
Antarc* Antarctica Graham Land Petermann Island West Antarctica |
op_source |
Czech Polar Reports; Vol 8 No 1 (2018); 94-106 Czech Polar Reports; Vol. 8 No. 1 (2018); 94-106 1805-0697 1805-0689 |
op_relation |
http://journals.muni.cz/CPR/article/view/12918/11270 http://journals.muni.cz/CPR/article/view/12918 |
op_rights |
Copyright (c) 2020 Czech Polar Reports https://creativecommons.org/licenses/by-nc-nd/4.0 |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766245078524755968 |