Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica
Detrital zircons of eight sandstone samples from the Triassic–Early Jurassic Section Peak Formation (Victoria Group, Beacon Supergroup) in northern Victoria Land, Antarctica, were investigated by U–Pb LA–ICPMS dating. The basin was flanked by the East Antarctic craton, and by a magmatic arc at the p...
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ftgeosoclonfig:oai:figshare.com:article/3453359 2023-05-15T13:33:01+02:00 Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica Martin Elsner Robert Schöner Axel Gerdes Reinhard Gaupp 2016-06-21T11:20:22Z https://doi.org/10.6084/m9.figshare.3453359.v1 https://figshare.com/articles/Reconstruction_of_the_early_Mesozoic_plate_margin_of_Gondwana_by_U_Pb_ages_of_detrital_zircons_from_northern_Victoria_Land___Antarctica/3453359 unknown doi:10.6084/m9.figshare.3453359.v1 https://figshare.com/articles/Reconstruction_of_the_early_Mesozoic_plate_margin_of_Gondwana_by_U_Pb_ages_of_detrital_zircons_from_northern_Victoria_Land___Antarctica/3453359 CC BY 4.0 CC-BY Geology Gondwana detrital zircon age spectra Mesozoic plate margin East Antarctic craton Antarctica Detrital zircons Ma LA Victoria Land Dataset 2016 ftgeosoclonfig https://doi.org/10.6084/m9.figshare.3453359.v1 2020-02-21T07:24:19Z Detrital zircons of eight sandstone samples from the Triassic–Early Jurassic Section Peak Formation (Victoria Group, Beacon Supergroup) in northern Victoria Land, Antarctica, were investigated by U–Pb LA–ICPMS dating. The basin was flanked by the East Antarctic craton, and by a magmatic arc at the palaeo-Pacific margin of Gondwana. It accommodated sandstones ranging from quartzo-feldspathic to volcaniclastic in composition. The detrital zircon age spectra yield pronounced concentrations at c. 190–250 Ma, 500–700 Ma and 800–1200 Ma. The proportion of Triassic–Early Jurassic zircons increases from base to top of the formation, and correlates positively with the abundance of detrital volcanic rock fragments. The youngest zircon ages are close to the stratigraphic age of each sample, indicating contemporaneous magmatic activity along the active margin of Gondwana. Igneous rocks that formed during the Ross Orogeny ( c. 470–545 Ma) were a minor source only, suggesting that the Ross Orogen became progressively covered by sediments as the basin expanded. Pan-African ( c. 500–700 Ma) and Grenville ( c. 800–1200 Ma) age zircons may have been derived from crustal sources currently covered beneath the polar ice sheet, although recycling from Cambro-Ordovician units provides an alternative explanation. Dataset Antarc* Antarctic Antarctica Ice Sheet Victoria Land Geological Society of London: Figshare Antarctic Pacific Section Peak ENVELOPE(161.917,161.917,-73.233,-73.233) Victoria Land |
institution |
Open Polar |
collection |
Geological Society of London: Figshare |
op_collection_id |
ftgeosoclonfig |
language |
unknown |
topic |
Geology Gondwana detrital zircon age spectra Mesozoic plate margin East Antarctic craton Antarctica Detrital zircons Ma LA Victoria Land |
spellingShingle |
Geology Gondwana detrital zircon age spectra Mesozoic plate margin East Antarctic craton Antarctica Detrital zircons Ma LA Victoria Land Martin Elsner Robert Schöner Axel Gerdes Reinhard Gaupp Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica |
topic_facet |
Geology Gondwana detrital zircon age spectra Mesozoic plate margin East Antarctic craton Antarctica Detrital zircons Ma LA Victoria Land |
description |
Detrital zircons of eight sandstone samples from the Triassic–Early Jurassic Section Peak Formation (Victoria Group, Beacon Supergroup) in northern Victoria Land, Antarctica, were investigated by U–Pb LA–ICPMS dating. The basin was flanked by the East Antarctic craton, and by a magmatic arc at the palaeo-Pacific margin of Gondwana. It accommodated sandstones ranging from quartzo-feldspathic to volcaniclastic in composition. The detrital zircon age spectra yield pronounced concentrations at c. 190–250 Ma, 500–700 Ma and 800–1200 Ma. The proportion of Triassic–Early Jurassic zircons increases from base to top of the formation, and correlates positively with the abundance of detrital volcanic rock fragments. The youngest zircon ages are close to the stratigraphic age of each sample, indicating contemporaneous magmatic activity along the active margin of Gondwana. Igneous rocks that formed during the Ross Orogeny ( c. 470–545 Ma) were a minor source only, suggesting that the Ross Orogen became progressively covered by sediments as the basin expanded. Pan-African ( c. 500–700 Ma) and Grenville ( c. 800–1200 Ma) age zircons may have been derived from crustal sources currently covered beneath the polar ice sheet, although recycling from Cambro-Ordovician units provides an alternative explanation. |
format |
Dataset |
author |
Martin Elsner Robert Schöner Axel Gerdes Reinhard Gaupp |
author_facet |
Martin Elsner Robert Schöner Axel Gerdes Reinhard Gaupp |
author_sort |
Martin Elsner |
title |
Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica |
title_short |
Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica |
title_full |
Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica |
title_fullStr |
Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica |
title_full_unstemmed |
Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica |
title_sort |
reconstruction of the early mesozoic plate margin of gondwana by u–pb ages of detrital zircons from northern victoria land, antarctica |
publishDate |
2016 |
url |
https://doi.org/10.6084/m9.figshare.3453359.v1 https://figshare.com/articles/Reconstruction_of_the_early_Mesozoic_plate_margin_of_Gondwana_by_U_Pb_ages_of_detrital_zircons_from_northern_Victoria_Land___Antarctica/3453359 |
long_lat |
ENVELOPE(161.917,161.917,-73.233,-73.233) |
geographic |
Antarctic Pacific Section Peak Victoria Land |
geographic_facet |
Antarctic Pacific Section Peak Victoria Land |
genre |
Antarc* Antarctic Antarctica Ice Sheet Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Victoria Land |
op_relation |
doi:10.6084/m9.figshare.3453359.v1 https://figshare.com/articles/Reconstruction_of_the_early_Mesozoic_plate_margin_of_Gondwana_by_U_Pb_ages_of_detrital_zircons_from_northern_Victoria_Land___Antarctica/3453359 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3453359.v1 |
_version_ |
1766037757052846080 |