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dc.contributor.author Moquet, Jean-Sébastien
dc.contributor.author Morera Julca, Sergio Byron
dc.contributor.author Turcq, Bruno
dc.contributor.author Poitrasson, Franck
dc.contributor.author Roddaz, Martin
dc.contributor.author Moreira-Turcq, Patricia
dc.contributor.author Espinoza, Jhan Carlo
dc.contributor.author Guyot, Jean-Loup
dc.contributor.author Takahashi, Ken
dc.contributor.author Orrillo-Vigo, Jhon
dc.contributor.author Petrick, Susana
dc.contributor.author Mounic, Stéphanie
dc.contributor.author Sondag, Francis
dc.date.accessioned 2020-02-28T12:24:06Z
dc.date.available 2020-02-28T12:24:06Z
dc.date.issued 2020-01
dc.identifier.citation Moquet, J. S., Morera, S., Turcq, B., Poitrasson, F., Roddaz, M., Moreira-Turcq, P., ... & Sondag, F. (2020). Control of seasonal and inter-annual rainfall distribution on the Strontium-Neodymium isotopic compositions of suspended particulate matter and implications for tracing ENSO events in the Pacific coast (Tumbes basin, Peru).==$Global and Planetary Change, 185,$==103080. https://doi.org/10.1016/j.gloplacha.2019.103080 es_ES
dc.identifier.govdoc index-oti2018
dc.identifier.issn 0921-8181
dc.identifier.uri http://repositorio.igp.gob.pe/handle/IGP/4771
dc.description.abstract “The geochemistry of riverine sediments exported to the oceans is important for paleo-hydro-climatic reconstruction. However, climate reconstruction requires a good understanding of the relationship between geochemistry and hydrological variability and sediment sources. In this study, we analyzed the major elements, the strontium neodymium radiogenic isotopes signatures (87Sr/86Sr and εNd) and the mineralogy of the suspended particulate matter (SPM) sampled monthly during two hydrologic years (2007–2008, a wet year, and 2010–2011, a normal hydrological year) upstream the Tumbes River outlet. The hydroclimate of this Ecuador-Peru binational basin is particularly sensitive to ENSO (El Niño Southern Oscillation) events. While mineralogy (dominated by illite) and the chemical alteration index (from 75 to 82) remain almost constant along the two hydrological years, 87Sr/86Sr (0.7115 to 0.7176) and εNd (−7.8 to −1.9) signatures are particularly sensitive to discharge and SPM concentration variations. Along the hydrological year, two sources control the εNd variability: (1) volcanic rocks, which dominate during the dry season, and (2) plutonic/metamorphic sources, whose contribution increases during the wet season. This behavior is confirmed by the correlation between εNd signature and the monthly rainfall contribution from volcanic area (R = 0.58; p-value < 0.01), and also with the daily discharge at the outlet (R = -0.73; p-value < 0.01). For most of the samples, 87Sr/86Sr is less variable along the hydrological year. However, two exceptional high discharge and SPM concentration conditions sampled exhibit more radiogenic (higher) 87Sr/86Sr signatures when plutonic/metamorphic rocks derived sediments are released in sufficient quantities to notably change the SPM isotopic Sr value of the Tumbes River. Hence, this study demonstrates that 87Sr/86Sr and εNd signatures can be used as powerful proxies for paleoclimate reconstructions based on sediment core's analysis in relation with spatial rainfall distribution and intensity in Pacific sedimentary basins submitted to the diversity of ENSO events”. es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher Elsevier es_ES
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.rights.uri http://creativecommons.org/licences/by-nc-nd/2.5/pe/ es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Suspended sediments es_ES
dc.subject Hydrology es_ES
dc.subject Radiogenic isotopes es_ES
dc.title Control of seasonal and inter-annual rainfall distribution on the Strontium-Neodymium isotopic compositions of suspended particulate matter and implications for tracing ENSO events in the Pacific coast (Tumbes basin, Peru) es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde Oceanografía, Hidrología, Recursos hídricos es_ES
dc.identifier.journal Global and Planetary Change es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.1016/j.gloplacha.2019.103080 es_ES

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