Microtextures and microintergrowths of irontitanium-aluminium oxide minerals in a magmatic tinaniferous iron ore from Attu island, southwestern Finland
Microtextures of coexisting magnetite, ilmenite and aluminous spinel and their chemical composition have been studied in a magmatic titaniferous iron ore from Attu Island in south-western Finland. Primary ilmenite contains exsolution lamellae of magnetite and aluminous spinel, oriented along the bas...
Published in: | Bulletin of the Geological Society of Finland |
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Geological Society of Finland
1977
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ftdoajarticles:oai:doaj.org/article:ad80b610dbbc47bfbddc6ff7a46cad7c 2023-05-15T15:33:29+02:00 Microtextures and microintergrowths of irontitanium-aluminium oxide minerals in a magmatic tinaniferous iron ore from Attu island, southwestern Finland H. van Lamoen 1977-12-01T00:00:00Z https://doi.org/10.17741/bgsf/49.2.004 https://doaj.org/article/ad80b610dbbc47bfbddc6ff7a46cad7c EN eng Geological Society of Finland http://www.geologinenseura.fi/bulletin/Volume49/sgs_bt_049_2_pages_089_104.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/49.2.004 0367-5211 1799-4632 https://doaj.org/article/ad80b610dbbc47bfbddc6ff7a46cad7c Bulletin of the Geological Society of Finland, Vol 49, Iss 2, Pp 89-104 (1977) Geology QE1-996.5 article 1977 ftdoajarticles https://doi.org/10.17741/bgsf/49.2.004 2022-12-30T22:11:40Z Microtextures of coexisting magnetite, ilmenite and aluminous spinel and their chemical composition have been studied in a magmatic titaniferous iron ore from Attu Island in south-western Finland. Primary ilmenite contains exsolution lamellae of magnetite and aluminous spinel, oriented along the basal plane (0001). The microtextures of magnetite have been formed by exsolution of aluminous spinel and by oxidation-exsolution of ilmenite along {100} and {111} — planes respectively. To some extent the exsolutions have been formed preferentially along planar structures like grain interfaces and intragranular high angle boundaries. Primary magnetite forms intergrowths with secondary ilmenite and aluminous spinel in border zones adjacent to primary ilmenite. These intergrowths partly show a similarity with exsolution textures of primary magnetite. The available data suggest that they have been formed by privileged growth of exsolved ilmenite and aluminous spinel in the magnetite border zones adjacent to ilmenite. Corrosion of magnetite by the adjacent ilmenite is considered to be less probable for the genesis of these intergrowths. Article in Journal/Newspaper Attu Directory of Open Access Journals: DOAJ Articles Attu Island ENVELOPE(172.909,172.909,52.903,52.903) Bulletin of the Geological Society of Finland 49 2 89 104 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 |
spellingShingle |
Geology QE1-996.5 H. van Lamoen Microtextures and microintergrowths of irontitanium-aluminium oxide minerals in a magmatic tinaniferous iron ore from Attu island, southwestern Finland |
topic_facet |
Geology QE1-996.5 |
description |
Microtextures of coexisting magnetite, ilmenite and aluminous spinel and their chemical composition have been studied in a magmatic titaniferous iron ore from Attu Island in south-western Finland. Primary ilmenite contains exsolution lamellae of magnetite and aluminous spinel, oriented along the basal plane (0001). The microtextures of magnetite have been formed by exsolution of aluminous spinel and by oxidation-exsolution of ilmenite along {100} and {111} — planes respectively. To some extent the exsolutions have been formed preferentially along planar structures like grain interfaces and intragranular high angle boundaries. Primary magnetite forms intergrowths with secondary ilmenite and aluminous spinel in border zones adjacent to primary ilmenite. These intergrowths partly show a similarity with exsolution textures of primary magnetite. The available data suggest that they have been formed by privileged growth of exsolved ilmenite and aluminous spinel in the magnetite border zones adjacent to ilmenite. Corrosion of magnetite by the adjacent ilmenite is considered to be less probable for the genesis of these intergrowths. |
format |
Article in Journal/Newspaper |
author |
H. van Lamoen |
author_facet |
H. van Lamoen |
author_sort |
H. van Lamoen |
title |
Microtextures and microintergrowths of irontitanium-aluminium oxide minerals in a magmatic tinaniferous iron ore from Attu island, southwestern Finland |
title_short |
Microtextures and microintergrowths of irontitanium-aluminium oxide minerals in a magmatic tinaniferous iron ore from Attu island, southwestern Finland |
title_full |
Microtextures and microintergrowths of irontitanium-aluminium oxide minerals in a magmatic tinaniferous iron ore from Attu island, southwestern Finland |
title_fullStr |
Microtextures and microintergrowths of irontitanium-aluminium oxide minerals in a magmatic tinaniferous iron ore from Attu island, southwestern Finland |
title_full_unstemmed |
Microtextures and microintergrowths of irontitanium-aluminium oxide minerals in a magmatic tinaniferous iron ore from Attu island, southwestern Finland |
title_sort |
microtextures and microintergrowths of irontitanium-aluminium oxide minerals in a magmatic tinaniferous iron ore from attu island, southwestern finland |
publisher |
Geological Society of Finland |
publishDate |
1977 |
url |
https://doi.org/10.17741/bgsf/49.2.004 https://doaj.org/article/ad80b610dbbc47bfbddc6ff7a46cad7c |
long_lat |
ENVELOPE(172.909,172.909,52.903,52.903) |
geographic |
Attu Island |
geographic_facet |
Attu Island |
genre |
Attu |
genre_facet |
Attu |
op_source |
Bulletin of the Geological Society of Finland, Vol 49, Iss 2, Pp 89-104 (1977) |
op_relation |
http://www.geologinenseura.fi/bulletin/Volume49/sgs_bt_049_2_pages_089_104.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/49.2.004 0367-5211 1799-4632 https://doaj.org/article/ad80b610dbbc47bfbddc6ff7a46cad7c |
op_doi |
https://doi.org/10.17741/bgsf/49.2.004 |
container_title |
Bulletin of the Geological Society of Finland |
container_volume |
49 |
container_issue |
2 |
container_start_page |
89 |
op_container_end_page |
104 |
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1766364041483124736 |