Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland
We present new isotopic data (U-Pb and Sm-Nd) from the Neoarchean granitoids of the Lentua complex, which is a part of the Western Karelia subprovince of the Fennoscandian Shield. Compositionally, the samples are granitoids belonging to the sanukitoid suite and K-rich granitoids. Certain samples int...
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Geological Society of Finland
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ftdoajarticles:oai:doaj.org/article:680244ee5382467a8cde0a6503c6e079 2023-05-15T16:13:03+02:00 Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland P. Mikkola E. Heilimo H. Huhma 2014-06-01T00:00:00Z https://doi.org/10.17741/bgsf/86.1.002 https://doaj.org/article/680244ee5382467a8cde0a6503c6e079 EN eng Geological Society of Finland http://www.geologinenseura.fi/bulletin/Volume86/Bulletin_vol86_1_2014_Mikkola.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/86.1.002 0367-5211 1799-4632 https://doaj.org/article/680244ee5382467a8cde0a6503c6e079 Bulletin of the Geological Society of Finland, Vol 86, Iss 1, Pp 23-40 (2014) sanukitoids granites leucogranite partial melting geochemistry absolute age isotopes U/Pb zircon Archean Neoarchean Finland Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.17741/bgsf/86.1.002 2022-12-31T09:05:51Z We present new isotopic data (U-Pb and Sm-Nd) from the Neoarchean granitoids of the Lentua complex, which is a part of the Western Karelia subprovince of the Fennoscandian Shield. Compositionally, the samples are granitoids belonging to the sanukitoid suite and K-rich granitoids. Certain samples interpreted as partial melts of pre-existing crust in this study display more mafic compositions than previously described from the surrounding areas. This indicates, at least locally, a source poorer in SiO2 than the TTG (Tonalite-Trondhjemite-Granodiorite) suite granitoids, which are the likely sources for the majority of the anatectic granitoids within the Lentua complex. Based on new geochronological data (LA-MC-ICPMS U-Pb on zircon), the sanukitoids and anatectic granitoids are at least partly coeval (2.69 Ga) in the area, but interaction between the two felsic magmas was limited. The dated sanukitoid sample is distinctly younger (2687±8 Ma) than the average age of the sanukitoids of the Western Karelia subprovince (2718±3 Ma) indicating, together with one previously published sanukitoid age, the existence of a younger sanukitoid phase. This study gives new important constraints to understanding the formation of the Western Karelia subprovince by expanding the observed compositional heterogeneity and the temporal overlap of the different Neoarchean granitoid suites. Article in Journal/Newspaper Fennoscandian karelia* Directory of Open Access Journals: DOAJ Articles Bulletin of the Geological Society of Finland 86 1 23 40 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
sanukitoids granites leucogranite partial melting geochemistry absolute age isotopes U/Pb zircon Archean Neoarchean Finland Geology QE1-996.5 |
spellingShingle |
sanukitoids granites leucogranite partial melting geochemistry absolute age isotopes U/Pb zircon Archean Neoarchean Finland Geology QE1-996.5 P. Mikkola E. Heilimo H. Huhma Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland |
topic_facet |
sanukitoids granites leucogranite partial melting geochemistry absolute age isotopes U/Pb zircon Archean Neoarchean Finland Geology QE1-996.5 |
description |
We present new isotopic data (U-Pb and Sm-Nd) from the Neoarchean granitoids of the Lentua complex, which is a part of the Western Karelia subprovince of the Fennoscandian Shield. Compositionally, the samples are granitoids belonging to the sanukitoid suite and K-rich granitoids. Certain samples interpreted as partial melts of pre-existing crust in this study display more mafic compositions than previously described from the surrounding areas. This indicates, at least locally, a source poorer in SiO2 than the TTG (Tonalite-Trondhjemite-Granodiorite) suite granitoids, which are the likely sources for the majority of the anatectic granitoids within the Lentua complex. Based on new geochronological data (LA-MC-ICPMS U-Pb on zircon), the sanukitoids and anatectic granitoids are at least partly coeval (2.69 Ga) in the area, but interaction between the two felsic magmas was limited. The dated sanukitoid sample is distinctly younger (2687±8 Ma) than the average age of the sanukitoids of the Western Karelia subprovince (2718±3 Ma) indicating, together with one previously published sanukitoid age, the existence of a younger sanukitoid phase. This study gives new important constraints to understanding the formation of the Western Karelia subprovince by expanding the observed compositional heterogeneity and the temporal overlap of the different Neoarchean granitoid suites. |
format |
Article in Journal/Newspaper |
author |
P. Mikkola E. Heilimo H. Huhma |
author_facet |
P. Mikkola E. Heilimo H. Huhma |
author_sort |
P. Mikkola |
title |
Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland |
title_short |
Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland |
title_full |
Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland |
title_fullStr |
Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland |
title_full_unstemmed |
Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland |
title_sort |
relationships between sanukitoids and crust-derived melts and their implications for the diversity of neoarchaean granitoids: a case study from surmansuo and nearby areas, eastern finland |
publisher |
Geological Society of Finland |
publishDate |
2014 |
url |
https://doi.org/10.17741/bgsf/86.1.002 https://doaj.org/article/680244ee5382467a8cde0a6503c6e079 |
genre |
Fennoscandian karelia* |
genre_facet |
Fennoscandian karelia* |
op_source |
Bulletin of the Geological Society of Finland, Vol 86, Iss 1, Pp 23-40 (2014) |
op_relation |
http://www.geologinenseura.fi/bulletin/Volume86/Bulletin_vol86_1_2014_Mikkola.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/86.1.002 0367-5211 1799-4632 https://doaj.org/article/680244ee5382467a8cde0a6503c6e079 |
op_doi |
https://doi.org/10.17741/bgsf/86.1.002 |
container_title |
Bulletin of the Geological Society of Finland |
container_volume |
86 |
container_issue |
1 |
container_start_page |
23 |
op_container_end_page |
40 |
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1765998661477597184 |