Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup
Volcanism associated with the Kerguelen Large Igneous Province is found scattered in southwestern Australia (the ca 136 to ca 130 Ma Bunbury Basalts, and ca 124 Ma Wallaby Plateau), India ( ca 118 Ma Rajmahal Traps and Cona Basalts), and Tibet (the ca 132 Ma Comei Basalts), but apart from the ∼70 00...
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ftunivtasecite:oai:ecite.utas.edu.au:121618 2023-05-15T13:49:03+02:00 Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup Direen, NG Cohen, BE Maas, R Frey, FA Whittaker, JM Coffin, MF Meffre, S Halpin, JA Crawford, AJ 2017 https://doi.org/10.1080/08120099.2017.1367326 http://ecite.utas.edu.au/121618 en eng Blackwell Publishing Asia http://dx.doi.org/10.1080/08120099.2017.1367326 Direen, NG and Cohen, BE and Maas, R and Frey, FA and Whittaker, JM and Coffin, MF and Meffre, S and Halpin, JA and Crawford, AJ, Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup, Australian Journal of Earth Sciences, 64, (7) pp. 851-869. ISSN 0812-0099 (2017) [Refereed Article] http://ecite.utas.edu.au/121618 Earth Sciences Geology Tectonics Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.1080/08120099.2017.1367326 2019-12-13T22:20:33Z Volcanism associated with the Kerguelen Large Igneous Province is found scattered in southwestern Australia (the ca 136 to ca 130 Ma Bunbury Basalts, and ca 124 Ma Wallaby Plateau), India ( ca 118 Ma Rajmahal Traps and Cona Basalts), and Tibet (the ca 132 Ma Comei Basalts), but apart from the ∼70 000 km 2 Wallaby Plateau, these examples are spatially and volumetrically minor. Here, we report dredge, geochronological and geochemical results from the ∼90 000 km 2 Naturaliste Plateau, located ∼170 to ∼500km southwest of Australia. Dredged lavas and intrusive rocks range from mafic to felsic compositions, and prior geophysical analyses indicate these units comprise much of the plateau substrate. 40 Ar/ 39 Ar plagioclase ages from mafic units and UPb zircon ages from silicic rocks indicate magmatic emplacement from 130.6 1.2 to 129.4 1.3 Ma for mafic rocks and 131.8 3.9 to 128.2 2.3 Ma for silicic rocks (2σ). These Cretaceous Naturaliste magmas incorporated a significant component of continental crust, with relatively high 87 Sr/ 86 Sr (up to 0.78), high 207 Pb/ 204 Pb ratios (15.515.6), low 143 Nd/ 144 Nd (0.5110.512) and primitive-mantle normalised Th/Nb of 11.3 and La/Nb of 3.97. These geochemical results are consistent with the plateau being underlain by continental basement, as indicated by prior interpretations of seismic and gravity data, corroborated by dredging of Mesoproterozoic granites and gneisses on the southern plateau flank. The Cretaceous Naturaliste Plateau igneous rocks have signatures indicative of extraction from a depleted mantle, with trace-element and isotopic values that overlap with Kerguelen Plateau lavas reflect crustal contamination. Our chemical and geochronological results therefore show the Naturaliste Plateau contains evidence of an extensive igneous event representing some of the earliest voluminous Kerguelen hotspot magmas. Prior work reports that contemporaneous correlative volcanic sequences underlie the nearby Mentelle Basin, and the Enderby Basin and Princess Elizabeth Trough in the Antarctic. When combined, the igneous rocks in the Naturaliste, Mentelle, Wallaby, Enderby, Princess Elizabeth, Bunbury and Comei-Cona areas form a 136124 Ma Large Igneous Province covering >244 000 km 2 . Article in Journal/Newspaper Antarc* Antarctic eCite UTAS (University of Tasmania) Antarctic The Antarctic Kerguelen Princess Elizabeth Trough ENVELOPE(83.000,83.000,-64.167,-64.167) Australian Journal of Earth Sciences 64 7 851 869 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Tectonics |
spellingShingle |
Earth Sciences Geology Tectonics Direen, NG Cohen, BE Maas, R Frey, FA Whittaker, JM Coffin, MF Meffre, S Halpin, JA Crawford, AJ Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup |
topic_facet |
Earth Sciences Geology Tectonics |
description |
Volcanism associated with the Kerguelen Large Igneous Province is found scattered in southwestern Australia (the ca 136 to ca 130 Ma Bunbury Basalts, and ca 124 Ma Wallaby Plateau), India ( ca 118 Ma Rajmahal Traps and Cona Basalts), and Tibet (the ca 132 Ma Comei Basalts), but apart from the ∼70 000 km 2 Wallaby Plateau, these examples are spatially and volumetrically minor. Here, we report dredge, geochronological and geochemical results from the ∼90 000 km 2 Naturaliste Plateau, located ∼170 to ∼500km southwest of Australia. Dredged lavas and intrusive rocks range from mafic to felsic compositions, and prior geophysical analyses indicate these units comprise much of the plateau substrate. 40 Ar/ 39 Ar plagioclase ages from mafic units and UPb zircon ages from silicic rocks indicate magmatic emplacement from 130.6 1.2 to 129.4 1.3 Ma for mafic rocks and 131.8 3.9 to 128.2 2.3 Ma for silicic rocks (2σ). These Cretaceous Naturaliste magmas incorporated a significant component of continental crust, with relatively high 87 Sr/ 86 Sr (up to 0.78), high 207 Pb/ 204 Pb ratios (15.515.6), low 143 Nd/ 144 Nd (0.5110.512) and primitive-mantle normalised Th/Nb of 11.3 and La/Nb of 3.97. These geochemical results are consistent with the plateau being underlain by continental basement, as indicated by prior interpretations of seismic and gravity data, corroborated by dredging of Mesoproterozoic granites and gneisses on the southern plateau flank. The Cretaceous Naturaliste Plateau igneous rocks have signatures indicative of extraction from a depleted mantle, with trace-element and isotopic values that overlap with Kerguelen Plateau lavas reflect crustal contamination. Our chemical and geochronological results therefore show the Naturaliste Plateau contains evidence of an extensive igneous event representing some of the earliest voluminous Kerguelen hotspot magmas. Prior work reports that contemporaneous correlative volcanic sequences underlie the nearby Mentelle Basin, and the Enderby Basin and Princess Elizabeth Trough in the Antarctic. When combined, the igneous rocks in the Naturaliste, Mentelle, Wallaby, Enderby, Princess Elizabeth, Bunbury and Comei-Cona areas form a 136124 Ma Large Igneous Province covering >244 000 km 2 . |
format |
Article in Journal/Newspaper |
author |
Direen, NG Cohen, BE Maas, R Frey, FA Whittaker, JM Coffin, MF Meffre, S Halpin, JA Crawford, AJ |
author_facet |
Direen, NG Cohen, BE Maas, R Frey, FA Whittaker, JM Coffin, MF Meffre, S Halpin, JA Crawford, AJ |
author_sort |
Direen, NG |
title |
Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup |
title_short |
Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup |
title_full |
Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup |
title_fullStr |
Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup |
title_full_unstemmed |
Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup |
title_sort |
naturaliste plateau: constraints on the timing and evolution of the kerguelen large igneous province and its role in gondwana breakup |
publisher |
Blackwell Publishing Asia |
publishDate |
2017 |
url |
https://doi.org/10.1080/08120099.2017.1367326 http://ecite.utas.edu.au/121618 |
long_lat |
ENVELOPE(83.000,83.000,-64.167,-64.167) |
geographic |
Antarctic The Antarctic Kerguelen Princess Elizabeth Trough |
geographic_facet |
Antarctic The Antarctic Kerguelen Princess Elizabeth Trough |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://dx.doi.org/10.1080/08120099.2017.1367326 Direen, NG and Cohen, BE and Maas, R and Frey, FA and Whittaker, JM and Coffin, MF and Meffre, S and Halpin, JA and Crawford, AJ, Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous province and its role in Gondwana breakup, Australian Journal of Earth Sciences, 64, (7) pp. 851-869. ISSN 0812-0099 (2017) [Refereed Article] http://ecite.utas.edu.au/121618 |
op_doi |
https://doi.org/10.1080/08120099.2017.1367326 |
container_title |
Australian Journal of Earth Sciences |
container_volume |
64 |
container_issue |
7 |
container_start_page |
851 |
op_container_end_page |
869 |
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1766250734509096960 |