1.90-1.88Ga arc magmatism of central Fennoscandia
The earliest Svecofennian magmatism in southern Finland has been dated at 1.90-1.88Ga. As an example of this, the Orijärvi (ca. 1.89Ga) and Enklinge (ca. 1.88Ga) volcanic centres comprise bimodal plutonic batholiths surrounded by volcanic rocks of comparable ages and chemical compositions. Here, we...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:188597 |
| Acceso en línea: | https://ddd.uab.cat/record/188597 https://dx.doi.org/urn:doi:10.1344/GeologicaActa2018.16.1.1 |
| Access Level: | acceso abierto |
| Palabra clave: | Fennoscandian shield Svecofennian orogeny Lu-Hf U-Pb Sm-Nd Geochemistry |
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1.90-1.88Ga arc magmatism of central Fennoscandiageochemistry, U-Pb geochronology, Sm-Nd and Lu-Hf isotope systematics of plutonic-volcanic rocks from southern FinlandKara, J.Väisänen, M.Johansson, A.Lahaye, Y.O'Brien, H.Eklund, O.Fennoscandian shieldSvecofennian orogenyLu-HfU-PbSm-NdGeochemistryThe earliest Svecofennian magmatism in southern Finland has been dated at 1.90-1.88Ga. As an example of this, the Orijärvi (ca. 1.89Ga) and Enklinge (ca. 1.88Ga) volcanic centres comprise bimodal plutonic batholiths surrounded by volcanic rocks of comparable ages and chemical compositions. Here, we report geochemical and Sm-Nd isotope data from intrusive and extrusive samples, combined with zircon U-Pb and Lu-Hf isotopes for granodiorites from both study areas. The samples range from gabbros to granites and indicate a subduction-related continental margin setting. The zircons from the Orijärvi granodiorite define an age of 1892±4Ma whereas the Enklinge granodiorite yields an age of 1882±6Ma. Several inherited ages of 2.25-1.95Ga as well as younger ages of 1.86-1.80Ga were found in the Enklinge granodiorite. The initial εNd values from the mafic rocks from both locations fall in the range +1.1 to +2.9 whereas the felsic rocks exhibit initial εNd values of -0.4 to +1.2. The magmatic zircons from the Orijärvi and Enklinge granodiorites show average initial εHf values of -1.1 (at 1892Ma) and zero (at 1882Ma), respectively, each with a spread of about 7 ε-units. The initial εHf values for the inherited zircons from Enklinge range from +3.5 to +7.6 with increasing age. The Sm-Nd data indicate that the mafic rocks were derived from a "mildly depleted" mantle source while the felsic rocks show larger crustal contribution. Also, the variation in εHf values indicates minor mixing between mildly depleted mantle derived magmas and crustal sources. U-Pb ages and Hf isotopes for inherited zircons in the Enklinge granodiorite suggest the presence of juvenile Svecofennian "proto-crust" at depth. 22018-01-0120182018-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/188597https://dx.doi.org/urn:doi:10.1344/GeologicaActa2018.16.1.1reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:1885972026-06-06T12:50:31Z |
| dc.title.none.fl_str_mv |
1.90-1.88Ga arc magmatism of central Fennoscandia geochemistry, U-Pb geochronology, Sm-Nd and Lu-Hf isotope systematics of plutonic-volcanic rocks from southern Finland |
| title |
1.90-1.88Ga arc magmatism of central Fennoscandia |
| spellingShingle |
1.90-1.88Ga arc magmatism of central Fennoscandia Kara, J. Fennoscandian shield Svecofennian orogeny Lu-Hf U-Pb Sm-Nd Geochemistry |
| title_short |
1.90-1.88Ga arc magmatism of central Fennoscandia |
| title_full |
1.90-1.88Ga arc magmatism of central Fennoscandia |
| title_fullStr |
1.90-1.88Ga arc magmatism of central Fennoscandia |
| title_full_unstemmed |
1.90-1.88Ga arc magmatism of central Fennoscandia |
| title_sort |
1.90-1.88Ga arc magmatism of central Fennoscandia |
| dc.creator.none.fl_str_mv |
Kara, J. Väisänen, M. Johansson, A. Lahaye, Y. O'Brien, H. Eklund, O. |
| author |
Kara, J. |
| author_facet |
Kara, J. Väisänen, M. Johansson, A. Lahaye, Y. O'Brien, H. Eklund, O. |
| author_role |
author |
| author2 |
Väisänen, M. Johansson, A. Lahaye, Y. O'Brien, H. Eklund, O. |
| author2_role |
author author author author author |
| dc.subject.none.fl_str_mv |
Fennoscandian shield Svecofennian orogeny Lu-Hf U-Pb Sm-Nd Geochemistry |
| topic |
Fennoscandian shield Svecofennian orogeny Lu-Hf U-Pb Sm-Nd Geochemistry |
| description |
The earliest Svecofennian magmatism in southern Finland has been dated at 1.90-1.88Ga. As an example of this, the Orijärvi (ca. 1.89Ga) and Enklinge (ca. 1.88Ga) volcanic centres comprise bimodal plutonic batholiths surrounded by volcanic rocks of comparable ages and chemical compositions. Here, we report geochemical and Sm-Nd isotope data from intrusive and extrusive samples, combined with zircon U-Pb and Lu-Hf isotopes for granodiorites from both study areas. The samples range from gabbros to granites and indicate a subduction-related continental margin setting. The zircons from the Orijärvi granodiorite define an age of 1892±4Ma whereas the Enklinge granodiorite yields an age of 1882±6Ma. Several inherited ages of 2.25-1.95Ga as well as younger ages of 1.86-1.80Ga were found in the Enklinge granodiorite. The initial εNd values from the mafic rocks from both locations fall in the range +1.1 to +2.9 whereas the felsic rocks exhibit initial εNd values of -0.4 to +1.2. The magmatic zircons from the Orijärvi and Enklinge granodiorites show average initial εHf values of -1.1 (at 1892Ma) and zero (at 1882Ma), respectively, each with a spread of about 7 ε-units. The initial εHf values for the inherited zircons from Enklinge range from +3.5 to +7.6 with increasing age. The Sm-Nd data indicate that the mafic rocks were derived from a "mildly depleted" mantle source while the felsic rocks show larger crustal contribution. Also, the variation in εHf values indicates minor mixing between mildly depleted mantle derived magmas and crustal sources. U-Pb ages and Hf isotopes for inherited zircons in the Enklinge granodiorite suggest the presence of juvenile Svecofennian "proto-crust" at depth. |
| publishDate |
2018 |
| dc.date.none.fl_str_mv |
2 2018-01-01 2018 2018-01-01 |
| dc.type.none.fl_str_mv |
Article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
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article |
| dc.identifier.none.fl_str_mv |
https://ddd.uab.cat/record/188597 https://dx.doi.org/urn:doi:10.1344/GeologicaActa2018.16.1.1 |
| url |
https://ddd.uab.cat/record/188597 https://dx.doi.org/urn:doi:10.1344/GeologicaActa2018.16.1.1 |
| dc.language.none.fl_str_mv |
Inglés eng |
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Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by-sa/4.0/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by-sa/4.0/ |
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openAccess |
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application/pdf |
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