Grenville-age continental arc magmatism and crustal evolution in central Dronning Maud Land (East Antarctica): Zircon geochronological and Hf-O isotopic evidence
This study focusses on the Grenville-age Maud Belt in Dronning Maud Land (DML), East Antarctica, which was located at the margin of the Proto-Kalahari Craton during the assembly of Rodinia. We present new U–Pb zircon ages and Hf–O isotope analyses of mafic and granitic gneisses exposed in the Orvin-...
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Online Access: | https://hdl.handle.net/1956/22590 https://doi.org/10.1016/j.gr.2019.12.004 |
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ftunivbergen:oai:bora.uib.no:1956/22590 2023-05-15T13:41:32+02:00 Grenville-age continental arc magmatism and crustal evolution in central Dronning Maud Land (East Antarctica): Zircon geochronological and Hf-O isotopic evidence Wang, Cheng-Cheng Jacobs, Joachim Elburg, Marlina A. Läufer, Andreas Thomas, Robert J. Elvevold, Synnøve 2020-02-17T09:34:24Z application/pdf https://hdl.handle.net/1956/22590 https://doi.org/10.1016/j.gr.2019.12.004 eng eng Elsevier Universitetet i Bergen: 812378 urn:issn:1342-937X urn:issn:1878-0571 https://hdl.handle.net/1956/22590 https://doi.org/10.1016/j.gr.2019.12.004 cristin:1778602 Gondwana Research. 2020, 82, 108-127. Attribution-NonCommercial-NoDerivs CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2019 Elsevier Gondwana Research VDP::Matematikk og naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural scienses: 400::Geosciences: 450 Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1016/j.gr.2019.12.004 2023-03-14T17:39:44Z This study focusses on the Grenville-age Maud Belt in Dronning Maud Land (DML), East Antarctica, which was located at the margin of the Proto-Kalahari Craton during the assembly of Rodinia. We present new U–Pb zircon ages and Hf–O isotope analyses of mafic and granitic gneisses exposed in the Orvin-Wohlthat Mountains and Gjelsvikfjella, central DML (cDML). The geochronological data indicate continuous magmatic activity from 1160 to 1070 Ma which culminated at 1110–1090 Ma, followed by high-grade metamorphism between 1080 and 1030 Ma. The majority of zircons from the Orvin-Wohlthat Mountains exhibit radiogenic Hf isotopic compositions corresponding to suprachondritic εHf (t) values and Mesoproterozoic model ages, indicating crystallization from predominantly juvenile magmas. However, the involvement of ancient sedimentary material, which were most likely derived from the adjacent Proto-Kalahari Craton, is revealed by a few samples with negative to neutral εHf (t) and significantly elevated δ18O values (8–10‰). Samples from further west, in Gjelsvikfjella have more mantle-like zircon O isotopic compositions and late Paleoproterozoic Hf model ages, indicating the incorporation of ancient, previously mantle-derived continental crust. The rocks in cDML, thus define part of an extensive Mesoproterozoic magmatic arc with subduction under the Proto-Kalahari margin. This involved significant growth of new continental crust, possibly related to slab retreat, accompanied by subordinate recycling of older crustal components. The Maud Belt has previously been correlated with the 1250–1030 Ma Natal Belt in southern Africa, which lay to the west in the context of Gondwana, although this assertion has recently been questioned. Our study supports the latter view in demonstrating that the continental arc magmatism in the Maud Belt appears to be temporally and tectonically unconnected to the accretion of (slightly older) juvenile oceanic islands in the Natal Belt, which, in contrast to the Maud Belt, show subduction polarity away ... Article in Journal/Newspaper Antarc* Antarctica DML Dronning Maud Land East Antarctica University of Bergen: Bergen Open Research Archive (BORA-UiB) Dronning Maud Land East Antarctica Gjelsvikfjella ENVELOPE(2.833,2.833,-72.083,-72.083) Wohlthat Mountains ENVELOPE(12.333,12.333,-71.583,-71.583) Gondwana Research 82 108 127 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural scienses: 400::Geosciences: 450 |
spellingShingle |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural scienses: 400::Geosciences: 450 Wang, Cheng-Cheng Jacobs, Joachim Elburg, Marlina A. Läufer, Andreas Thomas, Robert J. Elvevold, Synnøve Grenville-age continental arc magmatism and crustal evolution in central Dronning Maud Land (East Antarctica): Zircon geochronological and Hf-O isotopic evidence |
topic_facet |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural scienses: 400::Geosciences: 450 |
description |
This study focusses on the Grenville-age Maud Belt in Dronning Maud Land (DML), East Antarctica, which was located at the margin of the Proto-Kalahari Craton during the assembly of Rodinia. We present new U–Pb zircon ages and Hf–O isotope analyses of mafic and granitic gneisses exposed in the Orvin-Wohlthat Mountains and Gjelsvikfjella, central DML (cDML). The geochronological data indicate continuous magmatic activity from 1160 to 1070 Ma which culminated at 1110–1090 Ma, followed by high-grade metamorphism between 1080 and 1030 Ma. The majority of zircons from the Orvin-Wohlthat Mountains exhibit radiogenic Hf isotopic compositions corresponding to suprachondritic εHf (t) values and Mesoproterozoic model ages, indicating crystallization from predominantly juvenile magmas. However, the involvement of ancient sedimentary material, which were most likely derived from the adjacent Proto-Kalahari Craton, is revealed by a few samples with negative to neutral εHf (t) and significantly elevated δ18O values (8–10‰). Samples from further west, in Gjelsvikfjella have more mantle-like zircon O isotopic compositions and late Paleoproterozoic Hf model ages, indicating the incorporation of ancient, previously mantle-derived continental crust. The rocks in cDML, thus define part of an extensive Mesoproterozoic magmatic arc with subduction under the Proto-Kalahari margin. This involved significant growth of new continental crust, possibly related to slab retreat, accompanied by subordinate recycling of older crustal components. The Maud Belt has previously been correlated with the 1250–1030 Ma Natal Belt in southern Africa, which lay to the west in the context of Gondwana, although this assertion has recently been questioned. Our study supports the latter view in demonstrating that the continental arc magmatism in the Maud Belt appears to be temporally and tectonically unconnected to the accretion of (slightly older) juvenile oceanic islands in the Natal Belt, which, in contrast to the Maud Belt, show subduction polarity away ... |
format |
Article in Journal/Newspaper |
author |
Wang, Cheng-Cheng Jacobs, Joachim Elburg, Marlina A. Läufer, Andreas Thomas, Robert J. Elvevold, Synnøve |
author_facet |
Wang, Cheng-Cheng Jacobs, Joachim Elburg, Marlina A. Läufer, Andreas Thomas, Robert J. Elvevold, Synnøve |
author_sort |
Wang, Cheng-Cheng |
title |
Grenville-age continental arc magmatism and crustal evolution in central Dronning Maud Land (East Antarctica): Zircon geochronological and Hf-O isotopic evidence |
title_short |
Grenville-age continental arc magmatism and crustal evolution in central Dronning Maud Land (East Antarctica): Zircon geochronological and Hf-O isotopic evidence |
title_full |
Grenville-age continental arc magmatism and crustal evolution in central Dronning Maud Land (East Antarctica): Zircon geochronological and Hf-O isotopic evidence |
title_fullStr |
Grenville-age continental arc magmatism and crustal evolution in central Dronning Maud Land (East Antarctica): Zircon geochronological and Hf-O isotopic evidence |
title_full_unstemmed |
Grenville-age continental arc magmatism and crustal evolution in central Dronning Maud Land (East Antarctica): Zircon geochronological and Hf-O isotopic evidence |
title_sort |
grenville-age continental arc magmatism and crustal evolution in central dronning maud land (east antarctica): zircon geochronological and hf-o isotopic evidence |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/22590 https://doi.org/10.1016/j.gr.2019.12.004 |
long_lat |
ENVELOPE(2.833,2.833,-72.083,-72.083) ENVELOPE(12.333,12.333,-71.583,-71.583) |
geographic |
Dronning Maud Land East Antarctica Gjelsvikfjella Wohlthat Mountains |
geographic_facet |
Dronning Maud Land East Antarctica Gjelsvikfjella Wohlthat Mountains |
genre |
Antarc* Antarctica DML Dronning Maud Land East Antarctica |
genre_facet |
Antarc* Antarctica DML Dronning Maud Land East Antarctica |
op_source |
Gondwana Research |
op_relation |
Universitetet i Bergen: 812378 urn:issn:1342-937X urn:issn:1878-0571 https://hdl.handle.net/1956/22590 https://doi.org/10.1016/j.gr.2019.12.004 cristin:1778602 Gondwana Research. 2020, 82, 108-127. |
op_rights |
Attribution-NonCommercial-NoDerivs CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2019 Elsevier |
op_doi |
https://doi.org/10.1016/j.gr.2019.12.004 |
container_title |
Gondwana Research |
container_volume |
82 |
container_start_page |
108 |
op_container_end_page |
127 |
_version_ |
1766151839796953088 |