New U-Pb zircon data for Maarianvaara granite and Tohmajärvi volcanic complex, eastern Finland: geologic implications
New U-Pb zircon ages reported for samples from the Maarianvaara granite and Tohmajärvi volcanic complex (TVC) corroborate previous estimates of their magmatic emplacement at ca. 1.85 Ga and 2.11 Ga, respectively. The ca. 1.85 Ga age of the largely undeformed Maarianvaara granite, which cuts the Prot...
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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_171_179.pdf |
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| author | Asko Kontinen Jarmo Kohonen Perttu Mikkola Matti Kurhila |
| author_facet | Asko Kontinen Jarmo Kohonen Perttu Mikkola Matti Kurhila |
| author_sort | Asko Kontinen |
| collection | DOAJ |
| description | New U-Pb zircon ages reported for samples from the Maarianvaara granite and Tohmajärvi volcanic complex (TVC) corroborate previous estimates of their magmatic emplacement at ca. 1.85 Ga and 2.11 Ga, respectively. The ca. 1.85 Ga age of the largely undeformed Maarianvaara granite, which cuts the Proterozoic protomylonitic foliation in the Archean basement gneisses, sets a minimum age for the basement-involved thrusting in North Karelia. Geological evidence and geochemical data for the Kylmäkallio sill, dated at ca. 2.11 Ga from Tohmajärvi, indicate it is cogenetic/coeval with mafic metavolcanic/hypabyssal intercalations occurring in both the TVC and the surrounding black schist layered metasedimentary rocks of the Tohmajärvi suite. Thus, burial of organic carbon in the sedimentary protoliths of the Tohmajärvi succession was evidently occurring at ca. 2.11 Ga, about 50 Ma earlier than has been assumed in some recent time-stratigraphic interpretations. |
| format | Article |
| id | doaj-art-bb968b944d3946e182607d8436e5b8cf |
| 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-bb968b944d3946e182607d8436e5b8cf2025-01-24T08:58:10ZengGeological Society of FinlandBulletin of the Geological Society of Finland0367-52111799-46322025-01-0196217118010.17741/bgsf/96.2.004New U-Pb zircon data for Maarianvaara granite and Tohmajärvi volcanic complex, eastern Finland: geologic implicationsAsko Kontinen0Jarmo Kohonen1Perttu Mikkola2Matti Kurhila3Salmintie 3, 71800 Siilinjärvi, FinlandUniversity of Helsinki, Department of Geosciences and Geography, FinlandGeological Survey of Finland, KuopioGeological Survey of Finland, EspooNew U-Pb zircon ages reported for samples from the Maarianvaara granite and Tohmajärvi volcanic complex (TVC) corroborate previous estimates of their magmatic emplacement at ca. 1.85 Ga and 2.11 Ga, respectively. The ca. 1.85 Ga age of the largely undeformed Maarianvaara granite, which cuts the Proterozoic protomylonitic foliation in the Archean basement gneisses, sets a minimum age for the basement-involved thrusting in North Karelia. Geological evidence and geochemical data for the Kylmäkallio sill, dated at ca. 2.11 Ga from Tohmajärvi, indicate it is cogenetic/coeval with mafic metavolcanic/hypabyssal intercalations occurring in both the TVC and the surrounding black schist layered metasedimentary rocks of the Tohmajärvi suite. Thus, burial of organic carbon in the sedimentary protoliths of the Tohmajärvi succession was evidently occurring at ca. 2.11 Ga, about 50 Ma earlier than has been assumed in some recent time-stratigraphic interpretations.https://www.geologinenseura.fi/sites/geologinenseura.fi/files/pages_from_bulletin_vol96_part_2_2024_171_179.pdfzirconu-pb agepaleoproterozoicmaarianvaara granitetohmajärvi volcanic complexregional deformationstratigraphycarbon burial |
| spellingShingle | Asko Kontinen Jarmo Kohonen Perttu Mikkola Matti Kurhila New U-Pb zircon data for Maarianvaara granite and Tohmajärvi volcanic complex, eastern Finland: geologic implications Bulletin of the Geological Society of Finland zircon u-pb age paleoproterozoic maarianvaara granite tohmajärvi volcanic complex regional deformation stratigraphy carbon burial |
| title | New U-Pb zircon data for Maarianvaara granite and Tohmajärvi volcanic complex, eastern Finland: geologic implications |
| title_full | New U-Pb zircon data for Maarianvaara granite and Tohmajärvi volcanic complex, eastern Finland: geologic implications |
| title_fullStr | New U-Pb zircon data for Maarianvaara granite and Tohmajärvi volcanic complex, eastern Finland: geologic implications |
| title_full_unstemmed | New U-Pb zircon data for Maarianvaara granite and Tohmajärvi volcanic complex, eastern Finland: geologic implications |
| title_short | New U-Pb zircon data for Maarianvaara granite and Tohmajärvi volcanic complex, eastern Finland: geologic implications |
| title_sort | new u pb zircon data for maarianvaara granite and tohmajarvi volcanic complex eastern finland geologic implications |
| topic | zircon u-pb age paleoproterozoic maarianvaara granite tohmajärvi volcanic complex regional deformation stratigraphy carbon burial |
| url | https://www.geologinenseura.fi/sites/geologinenseura.fi/files/pages_from_bulletin_vol96_part_2_2024_171_179.pdf |
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