Basement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana
U–Pb sensitive high-resolution ion microprobe data together with geochemical and Nd isotope analyses obtained in the basement complex of the Sierra de la Ventana Fold Belt indicate that the Early Palaeozoic passive margin history of the basin followed Cambrian magmatism related to rifting in a 600 M...
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Geological Society of London
2016
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ftdatacite:10.6084/m9.figshare.3454169 2023-05-15T13:34:28+02:00 Basement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana C.W. Rapela R.J. Pankhurst C.M. Fanning L.E. Grecco 2016 https://dx.doi.org/10.6084/m9.figshare.3454169 https://geolsoc.figshare.com/articles/dataset/Basement_evolution_of_the_Sierra_de_la_Ventana_Fold_Belt_new_evidence_for_Cambrian_continental_rifting_along_the_southern___margin_of_Gondwana/3454169 unknown Geological Society of London https://dx.doi.org/10.1144/0016-764902-112 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences dataset Dataset 2016 ftdatacite https://doi.org/10.6084/m9.figshare.3454169 https://doi.org/10.1144/0016-764902-112 2021-11-05T12:55:41Z U–Pb sensitive high-resolution ion microprobe data together with geochemical and Nd isotope analyses obtained in the basement complex of the Sierra de la Ventana Fold Belt indicate that the Early Palaeozoic passive margin history of the basin followed Cambrian magmatism related to rifting in a 600 Ma Neoproterozoic crust. The Cambrian episode started with intrusion of 531 ± 4 and 524 ± 5 Ma A- and I-type granites derived from a dehydrated infracrustal source ( ε Nd 530 −3.1 to −5.9), and culminated with eruption of high-Zr peralkaline spherulitic rhyolites derived from an undepleted lithospheric mantle (509 ± 5 Ma; ε Nd 509 +0.5 to +1.0). These rift-related magmatic rocks were covered by shelf sediments deposited along a once-continuous passive margin, encompassing the Sierra de la Ventana Fold Belt, the Cape Fold Belt, the Falkland/Malvinas microplate and the Ellsworth Mountains block in Antarctica. The Cambrian rifting event defined the outline shape of the southern part of Gondwana, and can be regarded as the initiation of the supercontinent stage, which lasted until Jurassic break-up. The conjugate continental fragments separated from Gondwana during the Cambrian rifting could be the source for microcontinents with c . 1000 Ma basement rocks that collided with the proto-Andean margin during Ordovician–Silurian times. Dataset Antarc* Antarctica DataCite Metadata Store (German National Library of Science and Technology) Ellsworth Mountains ENVELOPE(-85.000,-85.000,-78.750,-78.750) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences C.W. Rapela R.J. Pankhurst C.M. Fanning L.E. Grecco Basement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
U–Pb sensitive high-resolution ion microprobe data together with geochemical and Nd isotope analyses obtained in the basement complex of the Sierra de la Ventana Fold Belt indicate that the Early Palaeozoic passive margin history of the basin followed Cambrian magmatism related to rifting in a 600 Ma Neoproterozoic crust. The Cambrian episode started with intrusion of 531 ± 4 and 524 ± 5 Ma A- and I-type granites derived from a dehydrated infracrustal source ( ε Nd 530 −3.1 to −5.9), and culminated with eruption of high-Zr peralkaline spherulitic rhyolites derived from an undepleted lithospheric mantle (509 ± 5 Ma; ε Nd 509 +0.5 to +1.0). These rift-related magmatic rocks were covered by shelf sediments deposited along a once-continuous passive margin, encompassing the Sierra de la Ventana Fold Belt, the Cape Fold Belt, the Falkland/Malvinas microplate and the Ellsworth Mountains block in Antarctica. The Cambrian rifting event defined the outline shape of the southern part of Gondwana, and can be regarded as the initiation of the supercontinent stage, which lasted until Jurassic break-up. The conjugate continental fragments separated from Gondwana during the Cambrian rifting could be the source for microcontinents with c . 1000 Ma basement rocks that collided with the proto-Andean margin during Ordovician–Silurian times. |
format |
Dataset |
author |
C.W. Rapela R.J. Pankhurst C.M. Fanning L.E. Grecco |
author_facet |
C.W. Rapela R.J. Pankhurst C.M. Fanning L.E. Grecco |
author_sort |
C.W. Rapela |
title |
Basement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana |
title_short |
Basement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana |
title_full |
Basement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana |
title_fullStr |
Basement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana |
title_full_unstemmed |
Basement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana |
title_sort |
basement evolution of the sierra de la ventana fold belt: new evidence for cambrian continental rifting along the southern margin of gondwana |
publisher |
Geological Society of London |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.3454169 https://geolsoc.figshare.com/articles/dataset/Basement_evolution_of_the_Sierra_de_la_Ventana_Fold_Belt_new_evidence_for_Cambrian_continental_rifting_along_the_southern___margin_of_Gondwana/3454169 |
long_lat |
ENVELOPE(-85.000,-85.000,-78.750,-78.750) |
geographic |
Ellsworth Mountains |
geographic_facet |
Ellsworth Mountains |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://dx.doi.org/10.1144/0016-764902-112 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3454169 https://doi.org/10.1144/0016-764902-112 |
_version_ |
1766053175856463872 |