Universidad Peruana Cayetano Heredia

Age and provenance of the Mio-Pleistocene sediments from the Sacaco area, Peruvian continental margin

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dc.contributor.author Ochoa, Diana
dc.contributor.author DeVries, T.J.
dc.contributor.author Quispe, Kelly
dc.contributor.author Barbosa-Espitia, A.
dc.contributor.author Salas Gismondi, Rodolfo Martín
dc.contributor.author Foster, D.A.
dc.contributor.author Gonzales, Renzo
dc.contributor.author Revillon, S.
dc.contributor.author Berrospi, R.
dc.contributor.author Pairazamán, L.
dc.contributor.author Cardich Salazar, Jorge Aquiles
dc.contributor.author Perez Segovia, Alexander
dc.contributor.author Romero, Pedro E.
dc.contributor.author Urbina, M.
dc.contributor.author Carré, Matthieu
dc.date.accessioned 2022-06-01T13:53:57Z
dc.date.available 2022-06-01T13:53:57Z
dc.date.issued 2022
dc.identifier.uri https://hdl.handle.net/20.500.12866/11745
dc.description.abstract Over the last decades, rocks from the East Pisco Basin (EPB), on the Central Peruvian coast (13°-16°S), have yielded an abundant and diverse collection of coastal-marine fossils, which are key for characterizing the onset and evolution of the modern Humboldt Current. Despite its paleontological richness, and after almost 40 years of study, the spatio-temporal context of the deposits of the southern part of the EPB (Sacaco area) remains only broadly constrained, being mostly tailored to particular vertebrate-rich levels occurring throughout the area. Here we build a composite stratigraphic section for the Sacaco area including three lithostratigraphic units (Pisco, Caracoles, and Pongo formations), which documents several discontinuities and intraformational unconformities. We infer depositional ages based on new radiometric (U–Pb), isotopic (Sr) and biostratigraphic data, synthesize previous litho-, chemo-, and bio-stratigraphic studies, and present a comprehensive chronostratigraphic review of the Mio-Pleistocene record for the Sacaco sub-basin that allows us to identify various local and basinal events. Our results indicate that, in the Sacaco area, the Pisco Formation ranges from ∼9.6 to 4.5 Ma, the overlying Caracoles Formation from 2.7 to ∼1.9 Ma, and the Pongo Formation accumulated from ∼1.9 up to at least 1.4 Ma. These sedimentary successions accumulated in a continually subsiding setting and show a shallowing-upwards trend. Zircon U–Pb provenance analysis mainly record Neoproterozoic, Cretaceous, and Mio-Pleistocene populations, revealing discrete up-section changes in source areas. Mio-Pleistocene and Cretaceous sources are continuously present, while older recycled-orogen sources vary through time in presence and abundance, indicating either paleogeographic changes or source exhaustion. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Journal of South American Earth Sciences
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Sacaco en_US
dc.subject Peruvian continental margin en_US
dc.subject Mio-pleistocene en_US
dc.subject Pisco basin en_US
dc.subject Provenance en_US
dc.subject U–Pb geochronology en_US
dc.title Age and provenance of the Mio-Pleistocene sediments from the Sacaco area, Peruvian continental margin en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.jsames.2022.103799
dc.relation.issn 1873-0647


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