Granitic magmatism by melting of juvenile continental crust: new constraints on the source of Palaeoproterozoic granitoids in Fennoscandia from Hf isotopes in zircon
Zircons from nine Palaeoproterozoic granitoid intrusions within the southern part of the Fennoscandian Shield have been studied by laser ablation inductively coupled plasma source mass spectrometry to obtain U–Pb ages (in the range 1.88–1.68 Ga) and Hf isotope compositions. Six granitoids are from t...
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ftgeosoclonfig:oai:figshare.com:article/3454589 2023-05-15T16:11:44+02:00 Granitic magmatism by melting of juvenile continental crust: new constraints on the source of Palaeoproterozoic granitoids in Fennoscandia from Hf isotopes in zircon Tom Andersen Ulf Bertil Andersson Stuart Graham Göran Åberg Siri L. Simonsen 2016-06-21T12:13:43Z https://doi.org/10.6084/m9.figshare.3454589.v1 https://figshare.com/articles/Granitic_magmatism_by_melting_of_juvenile_continental_crust_new_constraints_on_the_source_of_Palaeoproterozoic_granitoids___in_Fennoscandia_from_Hf_isotopes_in_zircon/3454589 unknown doi:10.6084/m9.figshare.3454589.v1 https://figshare.com/articles/Granitic_magmatism_by_melting_of_juvenile_continental_crust_new_constraints_on_the_source_of_Palaeoproterozoic_granitoids___in_Fennoscandia_from_Hf_isotopes_in_zircon/3454589 CC BY 4.0 CC-BY Geology 10 6 km 3 granitic magmas Palaeoproterozoic granitoid intrusions Hf isotope compositions laser ablation inductively crust plasma source mass spectrometry Ga Dataset 2016 ftgeosoclonfig https://doi.org/10.6084/m9.figshare.3454589.v1 2020-02-21T07:23:24Z Zircons from nine Palaeoproterozoic granitoid intrusions within the southern part of the Fennoscandian Shield have been studied by laser ablation inductively coupled plasma source mass spectrometry to obtain U–Pb ages (in the range 1.88–1.68 Ga) and Hf isotope compositions. Six granitoids are from the 1.85–1.65 Ga Transscandinavian Igneous Belt; during that period more than 10 6 km 3 of granitoid magma intruded the pre-existing crust. The large majority of magmatic zircons from the nine granitoids have a limited initial range, 176 Hf/ 177 Hf = 0.2816–0.2818, and define an evolutionary trend given by an initial value of ε Hf(1.88Ga) ≈ +2 ± 3 at an average 176 Lu/ 177 Hf = 0.015. These data show that a geographically extensive, long-lived, relatively homogeneous, and dominant magma source resided within 2.1–1.86 Ga Svecofennian juvenile crust between 1.88 and 1.68 Ga. Zircon xenocrysts (1.91–1.98 Ga) with initial ε Hf = +0 to +2.5 from one of the intrusions provide additional evidence for such a long-lived crustal source of granitic magmas in central Fennoscandia. The granitoids were emplaced during a period of active mafic underplating that supplied heat to the anatectic zone in the lower–middle crust, but little or no mantle-derived Hf to the granitic magmas, in contrast to many mixed intermediate rocks. Dataset Fennoscandia Fennoscandian Geological Society of London: Figshare |
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Open Polar |
collection |
Geological Society of London: Figshare |
op_collection_id |
ftgeosoclonfig |
language |
unknown |
topic |
Geology 10 6 km 3 granitic magmas Palaeoproterozoic granitoid intrusions Hf isotope compositions laser ablation inductively crust plasma source mass spectrometry Ga |
spellingShingle |
Geology 10 6 km 3 granitic magmas Palaeoproterozoic granitoid intrusions Hf isotope compositions laser ablation inductively crust plasma source mass spectrometry Ga Tom Andersen Ulf Bertil Andersson Stuart Graham Göran Åberg Siri L. Simonsen Granitic magmatism by melting of juvenile continental crust: new constraints on the source of Palaeoproterozoic granitoids in Fennoscandia from Hf isotopes in zircon |
topic_facet |
Geology 10 6 km 3 granitic magmas Palaeoproterozoic granitoid intrusions Hf isotope compositions laser ablation inductively crust plasma source mass spectrometry Ga |
description |
Zircons from nine Palaeoproterozoic granitoid intrusions within the southern part of the Fennoscandian Shield have been studied by laser ablation inductively coupled plasma source mass spectrometry to obtain U–Pb ages (in the range 1.88–1.68 Ga) and Hf isotope compositions. Six granitoids are from the 1.85–1.65 Ga Transscandinavian Igneous Belt; during that period more than 10 6 km 3 of granitoid magma intruded the pre-existing crust. The large majority of magmatic zircons from the nine granitoids have a limited initial range, 176 Hf/ 177 Hf = 0.2816–0.2818, and define an evolutionary trend given by an initial value of ε Hf(1.88Ga) ≈ +2 ± 3 at an average 176 Lu/ 177 Hf = 0.015. These data show that a geographically extensive, long-lived, relatively homogeneous, and dominant magma source resided within 2.1–1.86 Ga Svecofennian juvenile crust between 1.88 and 1.68 Ga. Zircon xenocrysts (1.91–1.98 Ga) with initial ε Hf = +0 to +2.5 from one of the intrusions provide additional evidence for such a long-lived crustal source of granitic magmas in central Fennoscandia. The granitoids were emplaced during a period of active mafic underplating that supplied heat to the anatectic zone in the lower–middle crust, but little or no mantle-derived Hf to the granitic magmas, in contrast to many mixed intermediate rocks. |
format |
Dataset |
author |
Tom Andersen Ulf Bertil Andersson Stuart Graham Göran Åberg Siri L. Simonsen |
author_facet |
Tom Andersen Ulf Bertil Andersson Stuart Graham Göran Åberg Siri L. Simonsen |
author_sort |
Tom Andersen |
title |
Granitic magmatism by melting of juvenile continental crust: new constraints on the source of Palaeoproterozoic granitoids in Fennoscandia from Hf isotopes in zircon |
title_short |
Granitic magmatism by melting of juvenile continental crust: new constraints on the source of Palaeoproterozoic granitoids in Fennoscandia from Hf isotopes in zircon |
title_full |
Granitic magmatism by melting of juvenile continental crust: new constraints on the source of Palaeoproterozoic granitoids in Fennoscandia from Hf isotopes in zircon |
title_fullStr |
Granitic magmatism by melting of juvenile continental crust: new constraints on the source of Palaeoproterozoic granitoids in Fennoscandia from Hf isotopes in zircon |
title_full_unstemmed |
Granitic magmatism by melting of juvenile continental crust: new constraints on the source of Palaeoproterozoic granitoids in Fennoscandia from Hf isotopes in zircon |
title_sort |
granitic magmatism by melting of juvenile continental crust: new constraints on the source of palaeoproterozoic granitoids in fennoscandia from hf isotopes in zircon |
publishDate |
2016 |
url |
https://doi.org/10.6084/m9.figshare.3454589.v1 https://figshare.com/articles/Granitic_magmatism_by_melting_of_juvenile_continental_crust_new_constraints_on_the_source_of_Palaeoproterozoic_granitoids___in_Fennoscandia_from_Hf_isotopes_in_zircon/3454589 |
genre |
Fennoscandia Fennoscandian |
genre_facet |
Fennoscandia Fennoscandian |
op_relation |
doi:10.6084/m9.figshare.3454589.v1 https://figshare.com/articles/Granitic_magmatism_by_melting_of_juvenile_continental_crust_new_constraints_on_the_source_of_Palaeoproterozoic_granitoids___in_Fennoscandia_from_Hf_isotopes_in_zircon/3454589 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3454589.v1 |
_version_ |
1765996913647157248 |