Petrology, geochemistry, and geochronology of the leucogranites in southernmost Finland
In the southernmost part of the Svecofennian province in Finland, leucogranites and migmatites stemming from both igneous and sedimentary protoliths reflect the complex magmatic history of the Svecofennian orogeny between 1.89 and 1.82 Ga. Although the migmatites and leucogranites in southernmost Fi...
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Geological Society of Finland
2025-01-01
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| Series: | Bulletin of the Geological Society of Finland |
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| Online Access: | https://www.geologinenseura.fi/sites/geologinenseura.fi/files/pages_from_bulletin_vol96_part_2_2024_101_133_0.pdf |
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| author | Anna Saukko Kaisa Nikkilä Olav Eklund Sören Fröjdö Markku Väisänen |
| author_facet | Anna Saukko Kaisa Nikkilä Olav Eklund Sören Fröjdö Markku Väisänen |
| author_sort | Anna Saukko |
| collection | DOAJ |
| description | In the southernmost part of the Svecofennian province in Finland, leucogranites and migmatites stemming from both igneous and sedimentary protoliths reflect the complex magmatic history of the Svecofennian orogeny between 1.89 and 1.82 Ga. Although the migmatites and leucogranites in southernmost Finland display similar ages as their counterparts elsewhere in the Southern Finland Subprovince, they differ in field appearance and composition. Field and petrographical observations reveal K-feldspar megacrysts of varying sizes in the migmatized early Svecofennian (c. 1.89–1.87 Ga)
supracrustal rocks and granitoids. Whole-rock geochemical analyses likewise display anomalously high K-contents in the early Svecofennian granitoids. Zircon U-Pb dating of migmatites and related leucogranites shows that a late Svecofennian partial melting event occurred at 1.84–1.82 Ga, possibly in several pulses. The morphological features of the migmatites as well as neosome mineralogy indicate a formation mechanism different from the dehydration melting prevalent elsewhere in the Subprovince. |
| format | Article |
| id | doaj-art-1affebaa20304f61ae0c82baf55986ad |
| institution | Kabale University |
| issn | 0367-5211 1799-4632 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Geological Society of Finland |
| record_format | Article |
| series | Bulletin of the Geological Society of Finland |
| spelling | doaj-art-1affebaa20304f61ae0c82baf55986ad2025-01-24T08:40:52ZengGeological Society of FinlandBulletin of the Geological Society of Finland0367-52111799-46322025-01-0196210113410.17741/bgsf/96.2.001Petrology, geochemistry, and geochronology of the leucogranites in southernmost FinlandAnna Saukko0Kaisa Nikkilä1Olav Eklund2Sören Fröjdö3Markku Väisänen4Geology and Mineralogy, Åbo Akademi University, Turku, Finland Geology and Mineralogy, Åbo Akademi University, Turku, Finland Geology and Mineralogy, Åbo Akademi University, Turku, Finland Geology and Mineralogy, Åbo Akademi University, Turku, Finland Department of Geography and Geology, University of Turku, FinlandIn the southernmost part of the Svecofennian province in Finland, leucogranites and migmatites stemming from both igneous and sedimentary protoliths reflect the complex magmatic history of the Svecofennian orogeny between 1.89 and 1.82 Ga. Although the migmatites and leucogranites in southernmost Finland display similar ages as their counterparts elsewhere in the Southern Finland Subprovince, they differ in field appearance and composition. Field and petrographical observations reveal K-feldspar megacrysts of varying sizes in the migmatized early Svecofennian (c. 1.89–1.87 Ga) supracrustal rocks and granitoids. Whole-rock geochemical analyses likewise display anomalously high K-contents in the early Svecofennian granitoids. Zircon U-Pb dating of migmatites and related leucogranites shows that a late Svecofennian partial melting event occurred at 1.84–1.82 Ga, possibly in several pulses. The morphological features of the migmatites as well as neosome mineralogy indicate a formation mechanism different from the dehydration melting prevalent elsewhere in the Subprovince.https://www.geologinenseura.fi/sites/geologinenseura.fi/files/pages_from_bulletin_vol96_part_2_2024_101_133_0.pdfsvecofenniansouthern finland subprovincemigmatiteleucogranitek-feldspar megacrystzircon u-pbwhole-rock geochemistry |
| spellingShingle | Anna Saukko Kaisa Nikkilä Olav Eklund Sören Fröjdö Markku Väisänen Petrology, geochemistry, and geochronology of the leucogranites in southernmost Finland Bulletin of the Geological Society of Finland svecofennian southern finland subprovince migmatite leucogranite k-feldspar megacryst zircon u-pb whole-rock geochemistry |
| title | Petrology, geochemistry, and geochronology of the leucogranites in southernmost Finland |
| title_full | Petrology, geochemistry, and geochronology of the leucogranites in southernmost Finland |
| title_fullStr | Petrology, geochemistry, and geochronology of the leucogranites in southernmost Finland |
| title_full_unstemmed | Petrology, geochemistry, and geochronology of the leucogranites in southernmost Finland |
| title_short | Petrology, geochemistry, and geochronology of the leucogranites in southernmost Finland |
| title_sort | petrology geochemistry and geochronology of the leucogranites in southernmost finland |
| topic | svecofennian southern finland subprovince migmatite leucogranite k-feldspar megacryst zircon u-pb whole-rock geochemistry |
| url | https://www.geologinenseura.fi/sites/geologinenseura.fi/files/pages_from_bulletin_vol96_part_2_2024_101_133_0.pdf |
| work_keys_str_mv | AT annasaukko petrologygeochemistryandgeochronologyoftheleucogranitesinsouthernmostfinland AT kaisanikkila petrologygeochemistryandgeochronologyoftheleucogranitesinsouthernmostfinland AT olaveklund petrologygeochemistryandgeochronologyoftheleucogranitesinsouthernmostfinland AT sorenfrojdo petrologygeochemistryandgeochronologyoftheleucogranitesinsouthernmostfinland AT markkuvaisanen petrologygeochemistryandgeochronologyoftheleucogranitesinsouthernmostfinland |