Rare-earth elements in Precambrian iron formations in Väyrylänkylä, South Puolanka area, Finland
Partial rare-earth element (REE) and ore analyses of 19 samples of oxide-, carbonate-, silicate-, and sulphide-facies rocks from the Superior-type Precambrian (Karelian) iron formations and associated rocks (pelitic metasediments, dolomite, basic tuffite and metadiabase) are given. For comparison on...
Published in: | Bulletin of the Geological Society of Finland |
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Geological Society of Finland
1975
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ftdoajarticles:oai:doaj.org/article:ed636c9d37c34217a9d479c78fa7f098 2023-05-15T17:00:20+02:00 Rare-earth elements in Precambrian iron formations in Väyrylänkylä, South Puolanka area, Finland K. Laajoki 1975-12-01T00:00:00Z https://doi.org/10.17741/bgsf/47.1-2.011 https://doaj.org/article/ed636c9d37c34217a9d479c78fa7f098 EN eng Geological Society of Finland http://www.geologinenseura.fi/bulletin/Volume47/sgs_bt_047_pages_093_107.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/47.1-2.011 0367-5211 1799-4632 https://doaj.org/article/ed636c9d37c34217a9d479c78fa7f098 Bulletin of the Geological Society of Finland, Vol 47, Iss 1-2, Pp 93-107 (1975) Geology QE1-996.5 article 1975 ftdoajarticles https://doi.org/10.17741/bgsf/47.1-2.011 2022-12-31T08:37:46Z Partial rare-earth element (REE) and ore analyses of 19 samples of oxide-, carbonate-, silicate-, and sulphide-facies rocks from the Superior-type Precambrian (Karelian) iron formations and associated rocks (pelitic metasediments, dolomite, basic tuffite and metadiabase) are given. For comparison one analysis of an Archean (Prekarelidic) iron formation of the Algoma type is also included. The Karelian iron formations are relatively rich in REE and their REE distribution patterns show depletion of Ce. This is due to the regularly occurring apatite, in which these features are multiplied as is indicated by the analysis of the apatite-rich band. This stratum is interpreted as a marine phosphorite interband and, consequently, the apatite in the iron formations as of marine origin. With the exception of Ce, the REE distribution patterns in iron formations and associated pelitic metasediments and dolomite are relatively similar. All these rocks show a clear trend towards relative depletion of the lighter REE and Yb and Lu in comparison with the North American shale (NAS). Metadiabase and basic tuffite are poor in REE and depleted in the lighter REE in the same way as are tholeitic basalts. Archean iron formations seem to have a greater Eu:Sm ratio than the younger iron formations. More REE data from geologically wellknown iron formations are needed, however, before any definitive conclusions can be drawn. Article in Journal/Newspaper karelia* karelian Directory of Open Access Journals: DOAJ Articles Bulletin of the Geological Society of Finland 47 1-2 93 107 |
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topic |
Geology QE1-996.5 |
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Geology QE1-996.5 K. Laajoki Rare-earth elements in Precambrian iron formations in Väyrylänkylä, South Puolanka area, Finland |
topic_facet |
Geology QE1-996.5 |
description |
Partial rare-earth element (REE) and ore analyses of 19 samples of oxide-, carbonate-, silicate-, and sulphide-facies rocks from the Superior-type Precambrian (Karelian) iron formations and associated rocks (pelitic metasediments, dolomite, basic tuffite and metadiabase) are given. For comparison one analysis of an Archean (Prekarelidic) iron formation of the Algoma type is also included. The Karelian iron formations are relatively rich in REE and their REE distribution patterns show depletion of Ce. This is due to the regularly occurring apatite, in which these features are multiplied as is indicated by the analysis of the apatite-rich band. This stratum is interpreted as a marine phosphorite interband and, consequently, the apatite in the iron formations as of marine origin. With the exception of Ce, the REE distribution patterns in iron formations and associated pelitic metasediments and dolomite are relatively similar. All these rocks show a clear trend towards relative depletion of the lighter REE and Yb and Lu in comparison with the North American shale (NAS). Metadiabase and basic tuffite are poor in REE and depleted in the lighter REE in the same way as are tholeitic basalts. Archean iron formations seem to have a greater Eu:Sm ratio than the younger iron formations. More REE data from geologically wellknown iron formations are needed, however, before any definitive conclusions can be drawn. |
format |
Article in Journal/Newspaper |
author |
K. Laajoki |
author_facet |
K. Laajoki |
author_sort |
K. Laajoki |
title |
Rare-earth elements in Precambrian iron formations in Väyrylänkylä, South Puolanka area, Finland |
title_short |
Rare-earth elements in Precambrian iron formations in Väyrylänkylä, South Puolanka area, Finland |
title_full |
Rare-earth elements in Precambrian iron formations in Väyrylänkylä, South Puolanka area, Finland |
title_fullStr |
Rare-earth elements in Precambrian iron formations in Väyrylänkylä, South Puolanka area, Finland |
title_full_unstemmed |
Rare-earth elements in Precambrian iron formations in Väyrylänkylä, South Puolanka area, Finland |
title_sort |
rare-earth elements in precambrian iron formations in väyrylänkylä, south puolanka area, finland |
publisher |
Geological Society of Finland |
publishDate |
1975 |
url |
https://doi.org/10.17741/bgsf/47.1-2.011 https://doaj.org/article/ed636c9d37c34217a9d479c78fa7f098 |
genre |
karelia* karelian |
genre_facet |
karelia* karelian |
op_source |
Bulletin of the Geological Society of Finland, Vol 47, Iss 1-2, Pp 93-107 (1975) |
op_relation |
http://www.geologinenseura.fi/bulletin/Volume47/sgs_bt_047_pages_093_107.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/47.1-2.011 0367-5211 1799-4632 https://doaj.org/article/ed636c9d37c34217a9d479c78fa7f098 |
op_doi |
https://doi.org/10.17741/bgsf/47.1-2.011 |
container_title |
Bulletin of the Geological Society of Finland |
container_volume |
47 |
container_issue |
1-2 |
container_start_page |
93 |
op_container_end_page |
107 |
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1766052984334057472 |