Review of the Cambrian Pampean orogeny of Argentina; a displaced orogen formerly attached to the Saldania Belt of South Africa?

The Pampean orogeny of northern Argentina resulted from Early Cambrian oblique collision of the Paleoproterozoic-Mesoproterozoic MARA block, formerly attached to Laurentia, with the Gondwanan Kalahari and Rio de la Plata cratons. The orogen is partially preserved because it is bounded by the younger...

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Autores principales: Casquet, César, Dahlquist, Juan Andrés, Verdecchia, Sebastián Osvaldo, Baldo, Edgardo Gaspar Agustín, Galindo, Carmen, Rapela, Carlos Washington, Pankhurst, Robert J., Morales Camera, Matías Martín, Murra, Juan Alberto Félix, Fanning, Christopher Mark
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2018
Materias:
Geología
Collisional orogeny
Gondwana
Mara terrane
Pampean orogeny
Saldanian orogeny
Sierras pampeanas
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/102591
https://ri.conicet.gov.ar/11336/45895
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-102591
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Collisional orogeny
Gondwana
Mara terrane
Pampean orogeny
Saldanian orogeny
Sierras pampeanas
spellingShingle Geología
Collisional orogeny
Gondwana
Mara terrane
Pampean orogeny
Saldanian orogeny
Sierras pampeanas
Casquet, César
Dahlquist, Juan Andrés
Verdecchia, Sebastián Osvaldo
Baldo, Edgardo Gaspar Agustín
Galindo, Carmen
Rapela, Carlos Washington
Pankhurst, Robert J.
Morales Camera, Matías Martín
Murra, Juan Alberto Félix
Fanning, Christopher Mark
Review of the Cambrian Pampean orogeny of Argentina; a displaced orogen formerly attached to the Saldania Belt of South Africa?
topic_facet Geología
Collisional orogeny
Gondwana
Mara terrane
Pampean orogeny
Saldanian orogeny
Sierras pampeanas
description The Pampean orogeny of northern Argentina resulted from Early Cambrian oblique collision of the Paleoproterozoic-Mesoproterozoic MARA block, formerly attached to Laurentia, with the Gondwanan Kalahari and Rio de la Plata cratons. The orogen is partially preserved because it is bounded by the younger Córdoba Fault on the east and by the Los Túneles-Guacha Corral Ordovician shear zone on the west. In this review we correlate the Pampean Belt with the Saldania orogenic belt of South Africa and argue that both formed at an active continental margin fed with sediments coming mainly from the erosion of the Brasiliano–Pan-African and East African–Antarctica orogens between ca. 570 and 537 Ma (Puncoviscana Formation) and between 557 and 552 Ma (Malmesbury Group) respectively. Magmatic arcs (I-type and S-type granitoids) formed at the margin between ca. 552 and 530 Ma. Further right-lateral oblique collision of MARA between ca. 530 and 520 Ma produced a westward verging thickened belt. This involved an upper plate with high P/T metamorphism and a lower plate with high-grade intermediate to high P/T metamorphism probably resulting from crustal delamination or root foundering. The Neoproterozoic to Early Cambrian sedimentary cover of MARA that was part of the lower plate is only recognized in the high-grade domain along with a dismembered mafic–ultramafic ophiolite probably obducted in the early stages of collision. Uplift was fast in the upper plate and slower in the lower plate. Eventually the Saldania and Pampean belts detached from each other along the right-lateral Córdoba Fault, juxtaposing the Rio de la Plata craton against the internal high-grade zone of the Pampean belt.
format Articulo
Preprint
author Casquet, César
Dahlquist, Juan Andrés
Verdecchia, Sebastián Osvaldo
Baldo, Edgardo Gaspar Agustín
Galindo, Carmen
Rapela, Carlos Washington
Pankhurst, Robert J.
Morales Camera, Matías Martín
Murra, Juan Alberto Félix
Fanning, Christopher Mark
author_facet Casquet, César
Dahlquist, Juan Andrés
Verdecchia, Sebastián Osvaldo
Baldo, Edgardo Gaspar Agustín
Galindo, Carmen
Rapela, Carlos Washington
Pankhurst, Robert J.
Morales Camera, Matías Martín
Murra, Juan Alberto Félix
Fanning, Christopher Mark
author_sort Casquet, César
title Review of the Cambrian Pampean orogeny of Argentina; a displaced orogen formerly attached to the Saldania Belt of South Africa?
title_short Review of the Cambrian Pampean orogeny of Argentina; a displaced orogen formerly attached to the Saldania Belt of South Africa?
title_full Review of the Cambrian Pampean orogeny of Argentina; a displaced orogen formerly attached to the Saldania Belt of South Africa?
title_fullStr Review of the Cambrian Pampean orogeny of Argentina; a displaced orogen formerly attached to the Saldania Belt of South Africa?
title_full_unstemmed Review of the Cambrian Pampean orogeny of Argentina; a displaced orogen formerly attached to the Saldania Belt of South Africa?
title_sort review of the cambrian pampean orogeny of argentina; a displaced orogen formerly attached to the saldania belt of south africa?
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/102591
https://ri.conicet.gov.ar/11336/45895
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