Universidad Peruana Cayetano Heredia

Late Neogene evolution of the Peruvian margin and its ecosystems: a synthesis from the Sacaco record

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dc.contributor.author Ochoa, Diana
dc.contributor.author Salas-Gismondi, R.
dc.contributor.author DeVries, T.J.
dc.contributor.author Baby, P.
dc.contributor.author de Muizon, C.
dc.contributor.author Altamirano, A.
dc.contributor.author Barbosa-Espitia, A.
dc.contributor.author Foster, D.A.
dc.contributor.author Quispe, Kelly
dc.contributor.author Cardich Salazar, Jorge Aquiles
dc.contributor.author Gutierrez Aguilar, Dimitri Alexey
dc.contributor.author Perez Segovia, Alexander
dc.contributor.author Valqui, J.
dc.contributor.author Urbina, M.
dc.contributor.author Carré, Matthieu
dc.date.accessioned 2021-05-18T21:44:16Z
dc.date.available 2021-05-18T21:44:16Z
dc.date.issued 2021
dc.identifier.uri https://hdl.handle.net/20.500.12866/9385
dc.description.abstract The highly productive waters of the Humboldt Current System (HCS) host a particular temperate ecosystem within the tropics, whose history is still largely unknown. The Pisco Formation, deposited during Mio-Pliocene times in the Peruvian continental margin has yielded an outstanding collection of coastal-marine fossils, providing an opportunity to understand the genesis of the HCS ecosystem. We present a comprehensive review, completed with new results, that integrates geological and paleontological data from the last 10 My, especially focusing on the southern East Pisco Basin (Sacaco area). We discuss the depositional settings of the Pisco Formation and integrate new U/Pb radiometric ages into the chronostratigraphic framework of the Sacaco sub-basin. The last preserved Pisco sediments at Sacaco were deposited ~ 4.5 Ma, while the overlying Caracoles Formation accumulated from ~ 2.7 Ma onwards. We identified a Pliocene angular unconformity encompassing 1.7 My between these formations, associated with a regional phase of uplift. Local and regional paleoenvironmental indicators suggest that shallow settings influenced by the offshore upwelling of ventilated and warm waters prevailed until the early Pliocene. We present an extensive synthesis of the late Miocene–Pleistocene vertebrate fossil record, which allows for an ecological characterization of the coastal-marine communities, an assessment of biodiversity trends, and changes in coastal-marine lineages in relation to modern HCS faunas. Our synthesis shows that: (i) typical endemic coastal Pisco vertebrates persisted up to ~ 4.5 Ma, (ii) first modern HCS toothed cetaceans appear at ~ 7–6 Ma, coinciding with a decline in genus diversity, and (iii) a vertebrate community closer to the current HCS was only reached after 2.7 Ma. The genesis of the Peruvian coastal ecosystem seems to be driven by a combination of stepwise transformations of the coastal geomorphology related to local tectonic pulses and by a global cooling trend leading to the modern oceanic circulation system en_US
dc.language.iso eng
dc.publisher Springer
dc.relation.ispartofseries International Journal of 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 Biodiversity en_US
dc.subject Faunal turnover en_US
dc.subject Humboldt current system en_US
dc.subject Mio-Pliocene transition en_US
dc.subject Pisco Basin en_US
dc.subject Sacaco en_US
dc.title Late Neogene evolution of the Peruvian margin and its ecosystems: a synthesis from the Sacaco record en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1007/s00531-021-02003-1
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.00
dc.relation.issn 1437-3262


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