U-Pb geochronology and paleogeography of the Valanginian–Hauterivian Neuquén Basin: Implications for Gondwana-scale source areas

Sedimentary basins located at the margins of continents act as the final base level for con­tinental-scale catchments that are sometimes located thousands of kilometers away from the basin, and this condition of exceptionally long sediment transfer zones is probably reinforced in supercontinents, su...

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Autores principales: Schwarz, Ernesto, Finzel, Emily S., Veiga, Gonzalo Diego, Rapela, Carlos Washington, Echevarría, C., Spalletti, Luis Antonio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Ciencias Naturales
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124088
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124088
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
spellingShingle Ciencias Naturales
Schwarz, Ernesto
Finzel, Emily S.
Veiga, Gonzalo Diego
Rapela, Carlos Washington
Echevarría, C.
Spalletti, Luis Antonio
U-Pb geochronology and paleogeography of the Valanginian–Hauterivian Neuquén Basin: Implications for Gondwana-scale source areas
topic_facet Ciencias Naturales
description Sedimentary basins located at the margins of continents act as the final base level for con­tinental-scale catchments that are sometimes located thousands of kilometers away from the basin, and this condition of exceptionally long sediment transfer zones is probably reinforced in supercontinents, such as Gondwana. One of the most prominent marine basins in southwestern Gondwana during the Jurassic and Early Cretaceous was the Neuquén Basin (west-central Argentina), but its role as a sediment repository of far-flung source areas has not been extensively considered. This contribution provides the first detailed detrital-zircon U-Pb geochronology of the Valanginian–Hauterivian Pilmatué Member of the Agrio Formation, which is combined with sedimentology and paleogeographic reconstructions of the unit within the Neuquén Basin for a better understanding of the fluvial delivery systems. Our detrital-zircon signatures suggest that Triassic–Permian zircon populations were probably sourced from the adjacent western sector of the North Patagonian Massif, whereas Early Jurassic, Cambrian, Ordovician, and Proterozoic grains were most likely derived from farther east, in the eastern sector of the North Patagonian Massif, as well as presently remote terranes such as the Saldania Belt in southern Africa. We thus propose a Valanginian–Hauterivian longitudinal delivery system that, starting in the mid-continent region of southwestern Gondwana and by effective sorting, was bringing fine-grained or finer caliber sand to the Neuquén Basin shoreline. This delivery system was probably active (though not necessarily continuously) from Early Jurassic to Early Cretaceous until finally coming to an end during the opening of the South Atlantic Ocean in the latest Early Cretaceous.
format Articulo
Articulo
author Schwarz, Ernesto
Finzel, Emily S.
Veiga, Gonzalo Diego
Rapela, Carlos Washington
Echevarría, C.
Spalletti, Luis Antonio
author_facet Schwarz, Ernesto
Finzel, Emily S.
Veiga, Gonzalo Diego
Rapela, Carlos Washington
Echevarría, C.
Spalletti, Luis Antonio
author_sort Schwarz, Ernesto
title U-Pb geochronology and paleogeography of the Valanginian–Hauterivian Neuquén Basin: Implications for Gondwana-scale source areas
title_short U-Pb geochronology and paleogeography of the Valanginian–Hauterivian Neuquén Basin: Implications for Gondwana-scale source areas
title_full U-Pb geochronology and paleogeography of the Valanginian–Hauterivian Neuquén Basin: Implications for Gondwana-scale source areas
title_fullStr U-Pb geochronology and paleogeography of the Valanginian–Hauterivian Neuquén Basin: Implications for Gondwana-scale source areas
title_full_unstemmed U-Pb geochronology and paleogeography of the Valanginian–Hauterivian Neuquén Basin: Implications for Gondwana-scale source areas
title_sort u-pb geochronology and paleogeography of the valanginian–hauterivian neuquén basin: implications for gondwana-scale source areas
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/124088
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