Post-kinematic mafic dykes in southern part of Central Svecofennia, Finland
The geochemical composition of seven post-kinematic mafic dykes in southern part of Central Svecofennia have been studied. Two dykes have been selected for in situ zircon U-Pb geochronology and one for in situ zircon Lu-Hf isotope analysis.These c. 1.86 Ga dykes can be divided into two subgroups by...
Main Authors: | , , , |
---|---|
Other Authors: | , |
Language: | English |
Published: |
Finland
2022
|
Subjects: | |
Online Access: | https://www.utupub.fi/handle/10024/164900 http://www.seismo.helsinki.fi/pdf/Lito2016.pdf |
id |
ftunivturku:oai:www.utupub.fi:10024/164900 |
---|---|
record_format |
openpolar |
spelling |
ftunivturku:oai:www.utupub.fi:10024/164900 2023-05-15T16:11:53+02:00 Post-kinematic mafic dykes in southern part of Central Svecofennia, Finland Lithosphere 2016: Ninth symposium on the Structure, Composition and Evolution of the Lithosphere in Fennoscandia J. Kara M. Väisänen H. O’Brien Y. Lahaye geologia, Geology 2606902 2022-10-28T13:23:57Z 47 50 https://www.utupub.fi/handle/10024/164900 http://www.seismo.helsinki.fi/pdf/Lito2016.pdf en eng Finland Suomi FI Helsinki Report - institute of seismology. university of helsinki. s 65 Lithosphere Report - Institute of seismology. University of helsinki 978-952-10-5081-7 https://www.utupub.fi/handle/10024/164900 http://www.seismo.helsinki.fi/pdf/Lito2016.pdf URN:NBN:fi-fe2021042715689 978-952-10-9282-5 0357-3060 2022 ftunivturku 2022-11-03T00:01:08Z The geochemical composition of seven post-kinematic mafic dykes in southern part of Central Svecofennia have been studied. Two dykes have been selected for in situ zircon U-Pb geochronology and one for in situ zircon Lu-Hf isotope analysis.These c. 1.86 Ga dykes can be divided into two subgroups by their geochemical characteristics: i) an enriched type with Nb contents up to 42 ppm, high contents of certain fluid mobile elements such as F, Ba, Sr, K2O and LREE and elevated contents of Fe2O3, Ti2O and P2O5, and ii) a primitive type with high MgO and Cr content. The primitive dyke exhibit positive, average c. +3, initial εHf values. The geochemical data combined with the petrological and the field observations suggest that the dykes are juvenile and derived from a subduction-enriched mantle source in a within-plate environment during the post-kinematic stage of the Svecofennian orogeny. Other/Unknown Material Fennoscandia University of Turku: UTUPub |
institution |
Open Polar |
collection |
University of Turku: UTUPub |
op_collection_id |
ftunivturku |
language |
English |
description |
The geochemical composition of seven post-kinematic mafic dykes in southern part of Central Svecofennia have been studied. Two dykes have been selected for in situ zircon U-Pb geochronology and one for in situ zircon Lu-Hf isotope analysis.These c. 1.86 Ga dykes can be divided into two subgroups by their geochemical characteristics: i) an enriched type with Nb contents up to 42 ppm, high contents of certain fluid mobile elements such as F, Ba, Sr, K2O and LREE and elevated contents of Fe2O3, Ti2O and P2O5, and ii) a primitive type with high MgO and Cr content. The primitive dyke exhibit positive, average c. +3, initial εHf values. The geochemical data combined with the petrological and the field observations suggest that the dykes are juvenile and derived from a subduction-enriched mantle source in a within-plate environment during the post-kinematic stage of the Svecofennian orogeny. |
author2 |
geologia, Geology 2606902 |
author |
J. Kara M. Väisänen H. O’Brien Y. Lahaye |
spellingShingle |
J. Kara M. Väisänen H. O’Brien Y. Lahaye Post-kinematic mafic dykes in southern part of Central Svecofennia, Finland |
author_facet |
J. Kara M. Väisänen H. O’Brien Y. Lahaye |
author_sort |
J. Kara |
title |
Post-kinematic mafic dykes in southern part of Central Svecofennia, Finland |
title_short |
Post-kinematic mafic dykes in southern part of Central Svecofennia, Finland |
title_full |
Post-kinematic mafic dykes in southern part of Central Svecofennia, Finland |
title_fullStr |
Post-kinematic mafic dykes in southern part of Central Svecofennia, Finland |
title_full_unstemmed |
Post-kinematic mafic dykes in southern part of Central Svecofennia, Finland |
title_sort |
post-kinematic mafic dykes in southern part of central svecofennia, finland |
publisher |
Finland |
publishDate |
2022 |
url |
https://www.utupub.fi/handle/10024/164900 http://www.seismo.helsinki.fi/pdf/Lito2016.pdf |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_relation |
Report - institute of seismology. university of helsinki. s 65 Lithosphere Report - Institute of seismology. University of helsinki 978-952-10-5081-7 https://www.utupub.fi/handle/10024/164900 http://www.seismo.helsinki.fi/pdf/Lito2016.pdf URN:NBN:fi-fe2021042715689 978-952-10-9282-5 0357-3060 |
_version_ |
1765997088336773120 |