Tectono-thermal evolution of the Maud Belt: New SHRIMP U-Pb data from Gjelsvikfjella, Dronning Maud Land, East Antarctica
The Maud Belt in Dronning Maud Land (western East Antarctic Craton) preserves a high-grade polyphase tectono-thermal history with two orogenic episodes of Mesoproterozoic (1.2-1.0 Ga) and Neoproterozoic (0.6-0.5 Ga) age. New SHRIMP U-Pb zircon data from southern Gjelsvikfjella in the northeastern pa...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/27273 2023-05-15T13:56:14+02:00 Tectono-thermal evolution of the Maud Belt: New SHRIMP U-Pb data from Gjelsvikfjella, Dronning Maud Land, East Antarctica Bisnath, Avinash Frimmel, H E Armstrong, Richard Board, W.S. 2015-12-07T22:51:02Z http://hdl.handle.net/1885/27273 unknown Elsevier 0301-9268 http://hdl.handle.net/1885/27273 Precambrian Research Keywords: data set dike granite granitoid island arc mafic rock magmatic differentiation magmatism mesotrophic environment metamorphism orogeny Proterozoic recrystallization SHRIMP dating tectonophysics uranium-lead dating zircon Antarctica East A East Antarctica Gjelsvikfjella Gondwana Maud Belt Zircon geochronology Journal article 2015 ftanucanberra 2015-12-28T23:21:57Z The Maud Belt in Dronning Maud Land (western East Antarctic Craton) preserves a high-grade polyphase tectono-thermal history with two orogenic episodes of Mesoproterozoic (1.2-1.0 Ga) and Neoproterozoic (0.6-0.5 Ga) age. New SHRIMP U-Pb zircon data from southern Gjelsvikfjella in the northeastern part of the belt make it possible to differentiate between a series of magmatic and metamorphic events. The oldest event recorded is the formation of an extensive 1140-1130 Ma volcanic arc. This was followed by 1104 ± 8 Ma granitoids that might represent, together with so far undated mafic dykes, part of a decompression melting-related bimodal suite that reflects the sub-continental Umkondo igneous event. The first high-grade metamorphism is constrained at 1070 Ma. The metamorphic age data are similar to those obtained from other parts of the Maud Belt, but also from the Namaqua-Natal Belt in South Africa, but the preceding arc formation was diachronous in the two belts. This indicates that the two belts did not form a continuous volcanic arc unit as suggested in previous models, but became connected only at the end of the Mesoproterozoic. Intense reworking during the Neoproterozoic, probably as a result of continent-continent collision between components of Gondwana, is indicated by ductile refliation, further high-grade metamorphic recrystallisation and metamorphic zircon overgrowths at approximately 530 Ma. This was followed by late- to post-tectonic magmatism, reflected by 500 Ma granite bodies and 490 Ma aplite dykes as well as a 480 Ma gabbro body. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Australian National University: ANU Digital Collections Antarctic Dronning Maud Land East Antarctica Gjelsvikfjella ENVELOPE(2.833,2.833,-72.083,-72.083) |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: data set dike granite granitoid island arc mafic rock magmatic differentiation magmatism mesotrophic environment metamorphism orogeny Proterozoic recrystallization SHRIMP dating tectonophysics uranium-lead dating zircon Antarctica East A East Antarctica Gjelsvikfjella Gondwana Maud Belt Zircon geochronology |
spellingShingle |
Keywords: data set dike granite granitoid island arc mafic rock magmatic differentiation magmatism mesotrophic environment metamorphism orogeny Proterozoic recrystallization SHRIMP dating tectonophysics uranium-lead dating zircon Antarctica East A East Antarctica Gjelsvikfjella Gondwana Maud Belt Zircon geochronology Bisnath, Avinash Frimmel, H E Armstrong, Richard Board, W.S. Tectono-thermal evolution of the Maud Belt: New SHRIMP U-Pb data from Gjelsvikfjella, Dronning Maud Land, East Antarctica |
topic_facet |
Keywords: data set dike granite granitoid island arc mafic rock magmatic differentiation magmatism mesotrophic environment metamorphism orogeny Proterozoic recrystallization SHRIMP dating tectonophysics uranium-lead dating zircon Antarctica East A East Antarctica Gjelsvikfjella Gondwana Maud Belt Zircon geochronology |
description |
The Maud Belt in Dronning Maud Land (western East Antarctic Craton) preserves a high-grade polyphase tectono-thermal history with two orogenic episodes of Mesoproterozoic (1.2-1.0 Ga) and Neoproterozoic (0.6-0.5 Ga) age. New SHRIMP U-Pb zircon data from southern Gjelsvikfjella in the northeastern part of the belt make it possible to differentiate between a series of magmatic and metamorphic events. The oldest event recorded is the formation of an extensive 1140-1130 Ma volcanic arc. This was followed by 1104 ± 8 Ma granitoids that might represent, together with so far undated mafic dykes, part of a decompression melting-related bimodal suite that reflects the sub-continental Umkondo igneous event. The first high-grade metamorphism is constrained at 1070 Ma. The metamorphic age data are similar to those obtained from other parts of the Maud Belt, but also from the Namaqua-Natal Belt in South Africa, but the preceding arc formation was diachronous in the two belts. This indicates that the two belts did not form a continuous volcanic arc unit as suggested in previous models, but became connected only at the end of the Mesoproterozoic. Intense reworking during the Neoproterozoic, probably as a result of continent-continent collision between components of Gondwana, is indicated by ductile refliation, further high-grade metamorphic recrystallisation and metamorphic zircon overgrowths at approximately 530 Ma. This was followed by late- to post-tectonic magmatism, reflected by 500 Ma granite bodies and 490 Ma aplite dykes as well as a 480 Ma gabbro body. |
format |
Article in Journal/Newspaper |
author |
Bisnath, Avinash Frimmel, H E Armstrong, Richard Board, W.S. |
author_facet |
Bisnath, Avinash Frimmel, H E Armstrong, Richard Board, W.S. |
author_sort |
Bisnath, Avinash |
title |
Tectono-thermal evolution of the Maud Belt: New SHRIMP U-Pb data from Gjelsvikfjella, Dronning Maud Land, East Antarctica |
title_short |
Tectono-thermal evolution of the Maud Belt: New SHRIMP U-Pb data from Gjelsvikfjella, Dronning Maud Land, East Antarctica |
title_full |
Tectono-thermal evolution of the Maud Belt: New SHRIMP U-Pb data from Gjelsvikfjella, Dronning Maud Land, East Antarctica |
title_fullStr |
Tectono-thermal evolution of the Maud Belt: New SHRIMP U-Pb data from Gjelsvikfjella, Dronning Maud Land, East Antarctica |
title_full_unstemmed |
Tectono-thermal evolution of the Maud Belt: New SHRIMP U-Pb data from Gjelsvikfjella, Dronning Maud Land, East Antarctica |
title_sort |
tectono-thermal evolution of the maud belt: new shrimp u-pb data from gjelsvikfjella, dronning maud land, east antarctica |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/27273 |
long_lat |
ENVELOPE(2.833,2.833,-72.083,-72.083) |
geographic |
Antarctic Dronning Maud Land East Antarctica Gjelsvikfjella |
geographic_facet |
Antarctic Dronning Maud Land East Antarctica Gjelsvikfjella |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica |
op_source |
Precambrian Research |
op_relation |
0301-9268 http://hdl.handle.net/1885/27273 |
_version_ |
1766263610561003520 |