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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ftgeosoclonfig:oai:figshare.com:article/3454169 2023-05-15T13:33:01+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 2016-06-21T11:56:59Z https://doi.org/10.6084/m9.figshare.3454169.v1 https://figshare.com/articles/Basement_evolution_of_the_Sierra_de_la_Ventana_Fold_Belt_new_evidence_for_Cambrian_continental_rifting_along_the_southern___margin_of_Gondwana/3454169 unknown doi:10.6084/m9.figshare.3454169.v1 https://figshare.com/articles/Basement_evolution_of_the_Sierra_de_la_Ventana_Fold_Belt_new_evidence_for_Cambrian_continental_rifting_along_the_southern___margin_of_Gondwana/3454169 CC BY 4.0 CC-BY Geology Gondwana ion microprobe data shelf sediments Ventana supercontinent stage Cambrian rifting infracrustal source Cambrian episode 1000 Ma basement rocks Nd isotope analyses outline shape Cambrian magmatism Basement evolution 600 Ma Neoproterozoic crust Sierra margin history Cambrian rifting event Ellsworth Mountains block Dataset 2016 ftgeosoclonfig https://doi.org/10.6084/m9.figshare.3454169.v1 2020-02-21T07:23:43Z 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 Geological Society of London: Figshare Ellsworth Mountains ENVELOPE(-85.000,-85.000,-78.750,-78.750) |
institution |
Open Polar |
collection |
Geological Society of London: Figshare |
op_collection_id |
ftgeosoclonfig |
language |
unknown |
topic |
Geology Gondwana ion microprobe data shelf sediments Ventana supercontinent stage Cambrian rifting infracrustal source Cambrian episode 1000 Ma basement rocks Nd isotope analyses outline shape Cambrian magmatism Basement evolution 600 Ma Neoproterozoic crust Sierra margin history Cambrian rifting event Ellsworth Mountains block |
spellingShingle |
Geology Gondwana ion microprobe data shelf sediments Ventana supercontinent stage Cambrian rifting infracrustal source Cambrian episode 1000 Ma basement rocks Nd isotope analyses outline shape Cambrian magmatism Basement evolution 600 Ma Neoproterozoic crust Sierra margin history Cambrian rifting event Ellsworth Mountains block 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 Gondwana ion microprobe data shelf sediments Ventana supercontinent stage Cambrian rifting infracrustal source Cambrian episode 1000 Ma basement rocks Nd isotope analyses outline shape Cambrian magmatism Basement evolution 600 Ma Neoproterozoic crust Sierra margin history Cambrian rifting event Ellsworth Mountains block |
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 |
publishDate |
2016 |
url |
https://doi.org/10.6084/m9.figshare.3454169.v1 https://figshare.com/articles/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 |
doi:10.6084/m9.figshare.3454169.v1 https://figshare.com/articles/Basement_evolution_of_the_Sierra_de_la_Ventana_Fold_Belt_new_evidence_for_Cambrian_continental_rifting_along_the_southern___margin_of_Gondwana/3454169 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3454169.v1 |
_version_ |
1766037733272190976 |