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The late Cenozoic evolution of the Humboldt Current System in coastal Peru: Insights from neodymium isotopes

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dc.contributor.author Kiel, S.
dc.contributor.author Jakubowicz, M.
dc.contributor.author Altamirano, A.
dc.contributor.author Belka, Z.
dc.contributor.author Dopieralska, J.
dc.contributor.author Urbina, M.
dc.contributor.author Salas Gismondi, Rodolfo Martín
dc.coverage.spatial Cuenca de Pisco
dc.coverage.spatial Cuenca de Sacaco
dc.date.accessioned 2023-02-20T13:28:09Z
dc.date.available 2023-02-20T13:28:09Z
dc.date.issued 2023
dc.identifier.uri https://hdl.handle.net/20.500.12866/13134
dc.description.abstract The Humboldt Current System along the Pacific coast of South America creates one of the most productive ecosystems on Earth. To trace the origin of the water masses in this area, we measured neodymium isotope compositions (ԑNd) in tooth enameloid of two genera of coastal sharks from latest Oligocene to early Pleistocene strata in the Pisco and Sacaco basins in southern Peru. Most ԑNd values range from −4 to −1, with a strong negative excursion in the late Miocene (∼8–7 million years ago [Ma]) with values as low as −9.2. The overall trend of the ԑNd values resembles that of equatorial Pacific deep waters, though with an offset of about +2 ԑNd units until about 6 Ma. With a major input of hinterland weathering considered unlikely, we interpret this pattern as reflecting a modern-type upwelling regime, though with a lower contribution of Antarctic waters than today. Starting about 6 Ma, the contribution of Antarctic waters to the upwelling waters increased approximately to present-day levels, coincident with, and possibly driven by, increased Antarctic glaciation and the Andes reaching their present-day elevation, both of which likely enhanced the counter-clockwise circulation in the South Pacific Ocean. The negative excursion of ԑNd values in the Pisco/Sacaco basins ∼8–7 Ma coincides with a late Miocene biogenic bloom in the Pacific Ocean and elsewhere, and with a strongly increased northward bottom current observed on the Nazca Drift System just offshore our sampling area. Thus, the negative excursion of ԑNd values in the Pisco/Sacaco basins likely resulted from a southern sourced input of nutrient-rich, unradiogenic water, which could have been an important contributor to the biogenic bloom. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Gondwana Research
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Cenozoic en_US
dc.subject El Nino en_US
dc.subject isotopic composition en_US
dc.subject Miocene en_US
dc.subject neodymium isotope en_US
dc.subject paleoceanography en_US
dc.subject Humboldt Current en_US
dc.subject Pacific Coast [South America] en_US
dc.subject Pacific Ocean en_US
dc.subject Peru en_US
dc.subject.mesh Isotope Labeling
dc.subject.mesh Neodymium
dc.subject.mesh Cold Currents
dc.subject.mesh South America
dc.subject.mesh Pacific Ocean
dc.subject.mesh Peru
dc.title The late Cenozoic evolution of the Humboldt Current System in coastal Peru: Insights from neodymium isotopes en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.gr.2022.12.008
dc.relation.issn 1878-0571


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