Petrochronology of the Terre Adélie Craton (East Antarctica) evidences a long-lasting Proterozoic (1.7–1.5 Ga) tectono-metamorphic evolution — Insights for the connections with the Gawler Craton and Laurentia
The Terre Adélie Craton displays superimposed strain fields related to the Neoarchean (2.6–2.4 Ga, M1) and Paleo-Mesoproterozoic (1.7–1.5 Ga, M2) metamorphic events. M1 is a regional granulite facies event, constrained by P-T modelling at ~0.8–1.0 GPa – 800–850 °C, followed by a decompressional retr...
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ftarchimer:oai:archimer.ifremer.fr:71145 2023-05-15T13:47:36+02:00 Petrochronology of the Terre Adélie Craton (East Antarctica) evidences a long-lasting Proterozoic (1.7–1.5 Ga) tectono-metamorphic evolution — Insights for the connections with the Gawler Craton and Laurentia Naumenko-dèzes, M.o. Rolland, Y. Lamarque, Gaelle Duclaux, G. Gallet, S. Bascou, J. Ménot, R.p. 2020-05 application/pdf https://archimer.ifremer.fr/doc/00599/71145/69465.pdf https://doi.org/10.1016/j.gr.2019.11.010 https://archimer.ifremer.fr/doc/00599/71145/ eng eng Elsevier BV https://archimer.ifremer.fr/doc/00599/71145/69465.pdf doi:10.1016/j.gr.2019.11.010 https://archimer.ifremer.fr/doc/00599/71145/ info:eu-repo/semantics/openAccess restricted use Gondwana Research (1342-937X) (Elsevier BV), 2020-05 , Vol. 81 , P. 21-57 East Antarctica Ar-40/Ar-39 dating Shear zones HT metamorphism P-T modelling Mafic magmatism text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1016/j.gr.2019.11.010 2021-09-23T20:34:09Z The Terre Adélie Craton displays superimposed strain fields related to the Neoarchean (2.6–2.4 Ga, M1) and Paleo-Mesoproterozoic (1.7–1.5 Ga, M2) metamorphic events. M1 is a regional granulite facies event, constrained by P-T modelling at ~0.8–1.0 GPa – 800–850 °C, followed by a decompressional retrogression in the upper amphibolite facies at ~0.6 GPa – 750 °C. M2 Stage 1 P-T peak is constrained at 0.6–0.7 GPa – 670–700 °C, followed by a steep P-T path down to 0.3 GPa – 550 °C. Retrogression after M2 PT peak occurred in a context of dextral shearing along the Mertz Shear Zone along with thrust motions within the eastern Terre Adélie Craton. In this paper, we present a series of 63 new 40Ar/39Ar ages of biotite and amphibole pairs in mafic rocks from a complete traverse of the Terre Adélie Craton. 40Ar/39Ar dating constrains M2 amphibolite facies metamorphism at a regional scale between 1700 and 1650 Ma, during stage 1 peak metamorphism. During retrogression, lower amphibolite facies recrystallization mainly occurred along vertical shear zones and mafic dykes between 1650 and 1600 Ma (Stage 2), followed by amphibolite to greenschist facies metamorphism until after 1500 Ma (Stage 3). At the scale of the Mawson continent, this event is related to the growth of an active margin above an oblique subduction zone. The supra-subduction model best explains opening of Dumont D'Urville and Hunter basins at 1.71 Ga followed by their rapid closure and metamorphism at 1.70 Ga. In this context, episodic shear zone reactivation and magmatic dyke emplacement led to a partial reequilibration of the 40Ar/39Ar system until <1500 Ma. This latter phase of mafic magmatism largely coincides with a hot spot event at the scale of the Gawler Craton and western Laurentia paleocontinent. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Dumont d'Urville ENVELOPE(140.017,140.017,-66.667,-66.667) Dumont-d'Urville ENVELOPE(140.013,140.013,-66.667,-66.667) East Antarctica Terre Adélie ENVELOPE(139.000,139.000,-67.000,-67.000) Terre-Adélie ENVELOPE(138.991,138.991,-59.999,-59.999) Gondwana Research 81 21 57 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
East Antarctica Ar-40/Ar-39 dating Shear zones HT metamorphism P-T modelling Mafic magmatism |
spellingShingle |
East Antarctica Ar-40/Ar-39 dating Shear zones HT metamorphism P-T modelling Mafic magmatism Naumenko-dèzes, M.o. Rolland, Y. Lamarque, Gaelle Duclaux, G. Gallet, S. Bascou, J. Ménot, R.p. Petrochronology of the Terre Adélie Craton (East Antarctica) evidences a long-lasting Proterozoic (1.7–1.5 Ga) tectono-metamorphic evolution — Insights for the connections with the Gawler Craton and Laurentia |
topic_facet |
East Antarctica Ar-40/Ar-39 dating Shear zones HT metamorphism P-T modelling Mafic magmatism |
description |
The Terre Adélie Craton displays superimposed strain fields related to the Neoarchean (2.6–2.4 Ga, M1) and Paleo-Mesoproterozoic (1.7–1.5 Ga, M2) metamorphic events. M1 is a regional granulite facies event, constrained by P-T modelling at ~0.8–1.0 GPa – 800–850 °C, followed by a decompressional retrogression in the upper amphibolite facies at ~0.6 GPa – 750 °C. M2 Stage 1 P-T peak is constrained at 0.6–0.7 GPa – 670–700 °C, followed by a steep P-T path down to 0.3 GPa – 550 °C. Retrogression after M2 PT peak occurred in a context of dextral shearing along the Mertz Shear Zone along with thrust motions within the eastern Terre Adélie Craton. In this paper, we present a series of 63 new 40Ar/39Ar ages of biotite and amphibole pairs in mafic rocks from a complete traverse of the Terre Adélie Craton. 40Ar/39Ar dating constrains M2 amphibolite facies metamorphism at a regional scale between 1700 and 1650 Ma, during stage 1 peak metamorphism. During retrogression, lower amphibolite facies recrystallization mainly occurred along vertical shear zones and mafic dykes between 1650 and 1600 Ma (Stage 2), followed by amphibolite to greenschist facies metamorphism until after 1500 Ma (Stage 3). At the scale of the Mawson continent, this event is related to the growth of an active margin above an oblique subduction zone. The supra-subduction model best explains opening of Dumont D'Urville and Hunter basins at 1.71 Ga followed by their rapid closure and metamorphism at 1.70 Ga. In this context, episodic shear zone reactivation and magmatic dyke emplacement led to a partial reequilibration of the 40Ar/39Ar system until <1500 Ma. This latter phase of mafic magmatism largely coincides with a hot spot event at the scale of the Gawler Craton and western Laurentia paleocontinent. |
format |
Article in Journal/Newspaper |
author |
Naumenko-dèzes, M.o. Rolland, Y. Lamarque, Gaelle Duclaux, G. Gallet, S. Bascou, J. Ménot, R.p. |
author_facet |
Naumenko-dèzes, M.o. Rolland, Y. Lamarque, Gaelle Duclaux, G. Gallet, S. Bascou, J. Ménot, R.p. |
author_sort |
Naumenko-dèzes, M.o. |
title |
Petrochronology of the Terre Adélie Craton (East Antarctica) evidences a long-lasting Proterozoic (1.7–1.5 Ga) tectono-metamorphic evolution — Insights for the connections with the Gawler Craton and Laurentia |
title_short |
Petrochronology of the Terre Adélie Craton (East Antarctica) evidences a long-lasting Proterozoic (1.7–1.5 Ga) tectono-metamorphic evolution — Insights for the connections with the Gawler Craton and Laurentia |
title_full |
Petrochronology of the Terre Adélie Craton (East Antarctica) evidences a long-lasting Proterozoic (1.7–1.5 Ga) tectono-metamorphic evolution — Insights for the connections with the Gawler Craton and Laurentia |
title_fullStr |
Petrochronology of the Terre Adélie Craton (East Antarctica) evidences a long-lasting Proterozoic (1.7–1.5 Ga) tectono-metamorphic evolution — Insights for the connections with the Gawler Craton and Laurentia |
title_full_unstemmed |
Petrochronology of the Terre Adélie Craton (East Antarctica) evidences a long-lasting Proterozoic (1.7–1.5 Ga) tectono-metamorphic evolution — Insights for the connections with the Gawler Craton and Laurentia |
title_sort |
petrochronology of the terre adélie craton (east antarctica) evidences a long-lasting proterozoic (1.7–1.5 ga) tectono-metamorphic evolution — insights for the connections with the gawler craton and laurentia |
publisher |
Elsevier BV |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00599/71145/69465.pdf https://doi.org/10.1016/j.gr.2019.11.010 https://archimer.ifremer.fr/doc/00599/71145/ |
long_lat |
ENVELOPE(140.017,140.017,-66.667,-66.667) ENVELOPE(140.013,140.013,-66.667,-66.667) ENVELOPE(139.000,139.000,-67.000,-67.000) ENVELOPE(138.991,138.991,-59.999,-59.999) |
geographic |
Dumont d'Urville Dumont-d'Urville East Antarctica Terre Adélie Terre-Adélie |
geographic_facet |
Dumont d'Urville Dumont-d'Urville East Antarctica Terre Adélie Terre-Adélie |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
Gondwana Research (1342-937X) (Elsevier BV), 2020-05 , Vol. 81 , P. 21-57 |
op_relation |
https://archimer.ifremer.fr/doc/00599/71145/69465.pdf doi:10.1016/j.gr.2019.11.010 https://archimer.ifremer.fr/doc/00599/71145/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.gr.2019.11.010 |
container_title |
Gondwana Research |
container_volume |
81 |
container_start_page |
21 |
op_container_end_page |
57 |
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1766247515520237568 |