The source of Proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ Hf–O isotopes of zircon in the Ahvenisto complex, southeastern Finland
The isotope compositions of massif-type anorthosites in Proterozoic anorthosite–mangerite–charnockite–granite (AMCG) complexes are commonly dominated by crustal values. Olivine-bearing anorthositic rocks in several AMCG suites have, however, been shown to display juvenile character, suggesting that...
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Geological Society of London
2016
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.3453818 https://geolsoc.figshare.com/articles/dataset/The_source_of_Proterozoic_anorthosite_and_rapakivi_granite_magmatism_evidence_from_combined_em_in_situ_em_Hf_O_isotopes_of_zircon_in_the_Ahvenisto_complex_southeastern_Finland/3453818 |
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ftdatacite:10.6084/m9.figshare.3453818 2023-05-15T16:12:59+02:00 The source of Proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ Hf–O isotopes of zircon in the Ahvenisto complex, southeastern Finland Heinonen, Aku Andersen, Tom O. Tapani Rämö Whitehouse, Martin 2016 https://dx.doi.org/10.6084/m9.figshare.3453818 https://geolsoc.figshare.com/articles/dataset/The_source_of_Proterozoic_anorthosite_and_rapakivi_granite_magmatism_evidence_from_combined_em_in_situ_em_Hf_O_isotopes_of_zircon_in_the_Ahvenisto_complex_southeastern_Finland/3453818 unknown Geological Society of London https://dx.doi.org/10.1144/jgs2014-013 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences dataset Dataset 2016 ftdatacite https://doi.org/10.6084/m9.figshare.3453818 https://doi.org/10.1144/jgs2014-013 2021-11-05T12:55:41Z The isotope compositions of massif-type anorthosites in Proterozoic anorthosite–mangerite–charnockite–granite (AMCG) complexes are commonly dominated by crustal values. Olivine-bearing anorthositic rocks in several AMCG suites have, however, been shown to display juvenile character, suggesting that variably depleted mantle reservoirs were involved in their genesis. A coupled in situ zircon Hf–O isotope dataset from the 1.64 Ga Ahvenisto AMCG complex in the 1.54–1.65 Ga Fennoscandian rapakivi granite–massif-type anorthosite province reveals correlated juvenile isotope signals (δ 18 O zrn = 5.4–6.6‰; initial ϵ Hf = −1.1 to +3.4) in the most primitive gabbroic rock type of the suite suggesting a depleted mantle origin for the anorthositic rocks. This signal is not as prominent in the more evolved co-magmatic anorthositic rocks (δ 18 O zrn = 6.3–7.8‰; initial ϵ Hf = −0.8 to +2.0), most probably owing to contamination of the mantle-derived primary magma by crustal material. A rapakivi granite associated with the anorthositic rocks has different isotope composition (δ 18 O zrn = 7.4–8.6‰; initial ϵ Hf = −2.1 to +0.5) that points to a crustal source. Dataset Fennoscandian DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Heinonen, Aku Andersen, Tom O. Tapani Rämö Whitehouse, Martin The source of Proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ Hf–O isotopes of zircon in the Ahvenisto complex, southeastern Finland |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
The isotope compositions of massif-type anorthosites in Proterozoic anorthosite–mangerite–charnockite–granite (AMCG) complexes are commonly dominated by crustal values. Olivine-bearing anorthositic rocks in several AMCG suites have, however, been shown to display juvenile character, suggesting that variably depleted mantle reservoirs were involved in their genesis. A coupled in situ zircon Hf–O isotope dataset from the 1.64 Ga Ahvenisto AMCG complex in the 1.54–1.65 Ga Fennoscandian rapakivi granite–massif-type anorthosite province reveals correlated juvenile isotope signals (δ 18 O zrn = 5.4–6.6‰; initial ϵ Hf = −1.1 to +3.4) in the most primitive gabbroic rock type of the suite suggesting a depleted mantle origin for the anorthositic rocks. This signal is not as prominent in the more evolved co-magmatic anorthositic rocks (δ 18 O zrn = 6.3–7.8‰; initial ϵ Hf = −0.8 to +2.0), most probably owing to contamination of the mantle-derived primary magma by crustal material. A rapakivi granite associated with the anorthositic rocks has different isotope composition (δ 18 O zrn = 7.4–8.6‰; initial ϵ Hf = −2.1 to +0.5) that points to a crustal source. |
format |
Dataset |
author |
Heinonen, Aku Andersen, Tom O. Tapani Rämö Whitehouse, Martin |
author_facet |
Heinonen, Aku Andersen, Tom O. Tapani Rämö Whitehouse, Martin |
author_sort |
Heinonen, Aku |
title |
The source of Proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ Hf–O isotopes of zircon in the Ahvenisto complex, southeastern Finland |
title_short |
The source of Proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ Hf–O isotopes of zircon in the Ahvenisto complex, southeastern Finland |
title_full |
The source of Proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ Hf–O isotopes of zircon in the Ahvenisto complex, southeastern Finland |
title_fullStr |
The source of Proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ Hf–O isotopes of zircon in the Ahvenisto complex, southeastern Finland |
title_full_unstemmed |
The source of Proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ Hf–O isotopes of zircon in the Ahvenisto complex, southeastern Finland |
title_sort |
source of proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ hf–o isotopes of zircon in the ahvenisto complex, southeastern finland |
publisher |
Geological Society of London |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.3453818 https://geolsoc.figshare.com/articles/dataset/The_source_of_Proterozoic_anorthosite_and_rapakivi_granite_magmatism_evidence_from_combined_em_in_situ_em_Hf_O_isotopes_of_zircon_in_the_Ahvenisto_complex_southeastern_Finland/3453818 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_relation |
https://dx.doi.org/10.1144/jgs2014-013 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3453818 https://doi.org/10.1144/jgs2014-013 |
_version_ |
1765998598909067264 |