Varieties and chemical composition of magnetite in the Varėna Iron Ore Deposit
Magnetites of the Varėna Iron Ore Deposit (VIOD) were thoroughly investigated by the Cameca SX-100 microprobe at the Warsaw University and by the Quanta 250 Energy Dispersive Spectroscopy (EDS) at the Nature Research Centre in Vilnius, Lithuania. Four generations of magnetite were distinguished in t...
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ftlitinstagrecon:oai:elaba:56547358 2023-05-15T17:04:11+02:00 Varieties and chemical composition of magnetite in the Varėna Iron Ore Deposit Prušinskienė, Sabina Šiliauskas, Laurynas Skridlaitė, Gražina 2017 application/pdf http://gtc.oai.elaba.lt/documents/56547358.pdf http://gtc.lvb.lt/GTC:ELABAPDB56547358&prefLang=en_US eng eng http://gtc.oai.elaba.lt/documents/56547358.pdf http://gtc.lvb.lt/GTC:ELABAPDB56547358&prefLang=en_US info:eu-repo/semantics/openAccess Chemija, Vilnius : Lietuvos Mokslų Akademija, 2017, vol. 28, no. 1, p. 39-57 ISSN 0235-7216 Crystalline basement Magnetite chemistry Metasomatism Ore chemistry Precambrian Scanning electron microscopy Varėna Iron Ore Deposit info:eu-repo/semantics/article 2017 ftlitinstagrecon 2021-12-02T00:49:12Z Magnetites of the Varėna Iron Ore Deposit (VIOD) were thoroughly investigated by the Cameca SX-100 microprobe at the Warsaw University and by the Quanta 250 Energy Dispersive Spectroscopy (EDS) at the Nature Research Centre in Vilnius, Lithuania. Four generations of magnetite were distinguished in the studied serpentine-magnetite ores (D8 drilling). The earliest, spinel inclusion-rich magnetite cores (Mag-1) might have formed during an early metamorphism and/or related skarn formation. They have the highest trace element (Si, Al, Mg, Ti, V, etc.) contents. Voluminous second magnetite (Mag-2) had replaced olivine, pyroxenes, spinel and other skarn minerals at c. 540 °C (Mag-Ilm geothermometer) and has trace elements washed out by hydrothermal fluids. The latest magnetites (Mag-3 and Mag-4) originated from the late thermal reworking by dissolution-reprecipitation processes. Some of the latest magnetites (Mag-4) are mostly related to the sulfide veins. As concerning the origin of the studied magnetites, they have similar trace element abundances as skarn magnetites, are in general Ti-poor. The Mag-1 is more than twice richer in Mg than the porphyry and Kiruna type iron ores. A slight enrichment in Al, Ti and V because of spinel and ilmenite inclusions may have caused the earliest Mag-1 to resemble the porphyry type ores, while the secondary Mag-2 has Al, Ca and Mn contents as low as the Kiruna type ores. Even though there are no precise age constructions for the iron ore formation process, it may be related to metamorphic, metasomatic and later hydrothermal processes, the last of which is assumed to have occurred during the c. 1.50 Ga within-plate AMCG magmatism. Article in Journal/Newspaper Kiruna LAEI VL (Lithuanian Institute of Agrarian Economics Virtual Library) Kiruna |
institution |
Open Polar |
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LAEI VL (Lithuanian Institute of Agrarian Economics Virtual Library) |
op_collection_id |
ftlitinstagrecon |
language |
English |
topic |
Crystalline basement Magnetite chemistry Metasomatism Ore chemistry Precambrian Scanning electron microscopy Varėna Iron Ore Deposit |
spellingShingle |
Crystalline basement Magnetite chemistry Metasomatism Ore chemistry Precambrian Scanning electron microscopy Varėna Iron Ore Deposit Prušinskienė, Sabina Šiliauskas, Laurynas Skridlaitė, Gražina Varieties and chemical composition of magnetite in the Varėna Iron Ore Deposit |
topic_facet |
Crystalline basement Magnetite chemistry Metasomatism Ore chemistry Precambrian Scanning electron microscopy Varėna Iron Ore Deposit |
description |
Magnetites of the Varėna Iron Ore Deposit (VIOD) were thoroughly investigated by the Cameca SX-100 microprobe at the Warsaw University and by the Quanta 250 Energy Dispersive Spectroscopy (EDS) at the Nature Research Centre in Vilnius, Lithuania. Four generations of magnetite were distinguished in the studied serpentine-magnetite ores (D8 drilling). The earliest, spinel inclusion-rich magnetite cores (Mag-1) might have formed during an early metamorphism and/or related skarn formation. They have the highest trace element (Si, Al, Mg, Ti, V, etc.) contents. Voluminous second magnetite (Mag-2) had replaced olivine, pyroxenes, spinel and other skarn minerals at c. 540 °C (Mag-Ilm geothermometer) and has trace elements washed out by hydrothermal fluids. The latest magnetites (Mag-3 and Mag-4) originated from the late thermal reworking by dissolution-reprecipitation processes. Some of the latest magnetites (Mag-4) are mostly related to the sulfide veins. As concerning the origin of the studied magnetites, they have similar trace element abundances as skarn magnetites, are in general Ti-poor. The Mag-1 is more than twice richer in Mg than the porphyry and Kiruna type iron ores. A slight enrichment in Al, Ti and V because of spinel and ilmenite inclusions may have caused the earliest Mag-1 to resemble the porphyry type ores, while the secondary Mag-2 has Al, Ca and Mn contents as low as the Kiruna type ores. Even though there are no precise age constructions for the iron ore formation process, it may be related to metamorphic, metasomatic and later hydrothermal processes, the last of which is assumed to have occurred during the c. 1.50 Ga within-plate AMCG magmatism. |
format |
Article in Journal/Newspaper |
author |
Prušinskienė, Sabina Šiliauskas, Laurynas Skridlaitė, Gražina |
author_facet |
Prušinskienė, Sabina Šiliauskas, Laurynas Skridlaitė, Gražina |
author_sort |
Prušinskienė, Sabina |
title |
Varieties and chemical composition of magnetite in the Varėna Iron Ore Deposit |
title_short |
Varieties and chemical composition of magnetite in the Varėna Iron Ore Deposit |
title_full |
Varieties and chemical composition of magnetite in the Varėna Iron Ore Deposit |
title_fullStr |
Varieties and chemical composition of magnetite in the Varėna Iron Ore Deposit |
title_full_unstemmed |
Varieties and chemical composition of magnetite in the Varėna Iron Ore Deposit |
title_sort |
varieties and chemical composition of magnetite in the varėna iron ore deposit |
publishDate |
2017 |
url |
http://gtc.oai.elaba.lt/documents/56547358.pdf http://gtc.lvb.lt/GTC:ELABAPDB56547358&prefLang=en_US |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
Kiruna |
genre_facet |
Kiruna |
op_source |
Chemija, Vilnius : Lietuvos Mokslų Akademija, 2017, vol. 28, no. 1, p. 39-57 ISSN 0235-7216 |
op_relation |
http://gtc.oai.elaba.lt/documents/56547358.pdf http://gtc.lvb.lt/GTC:ELABAPDB56547358&prefLang=en_US |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766058242278948864 |