REE geochemistry of neogene–holocene sediments of La Fontanilla Cove (Tinto Estuary, SW Spain)
Author
Prudêncio, Maria Isabel; Ruiz, Francisco; Marques, Rosa; Dias, Maria Isabel; Rodriguez Vidal, Joaquín; Rodrigues, Ana Luisa; Cáceres, Luis Miguel; González-Regalado, María Luz; Muñoz, Juan Manuel; Pozo Rodríguez, Manuel
Entity
UAM. Departamento de Geología y GeoquímicaPublisher
MPDIDate
2022-03-29Citation
10.3390/min12040417
Minerals 12.4 (2022): 417
ISSN
2075-163XDOI
10.3390/min12040417Project
eu-repo/granAgreement/EC/FEDER/ UHU-1260298Editor's Version
https://www.mdpi.com/2075-163X/12/4/417Subjects
rare earth elements; estuarine sediments cores; sedimentary facies; acid drainage; paleoenvironmental reconstruction; Tinto River; GeologíaRights
© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) licenseAbstract
The Tinto and Odiel rivers (SW Spain) drain from a vast sulfide mining district and join at a 20-km-long estuary that enters the Atlantic Ocean. In this work, the contents of rare earth elements (REE) and fractionation in Neogene–Holocene sediment cores from La Fontanilla cove (Tinto estuary) were studied. The sediments were collected from a depth of 18 m at different distances from the recent river flow and were analyzed for new information on the temporal development of the REE load in the sediment column. Results show that the ∑ REE is higher in the finer sediments and during periods of mining activity from prehistoric to recent times. Marine influence appears to increase the light REE (LREE) relative to the heavy REE (HREE). The REE patterns of these estuarine sediments show convex curvatures in the MREE relative to the LREE and HREE, indicating the presence of acid-mixing processes between the fluvial waters affected by acid mine drainage (AMD) and seawater, as well as the precipitation of poorly crystalline mineral phases. Significant positive Eu anomalies were found in ebb-tide channels and marsh deposits, which can reflect the mineralogical composition and/or a strong localized salinity gradient combined with organic matter degradation. Sedimentological characteristics of the deposits appear to play the main role in accumulation and fractionation of the REE
Files in this item
Google Scholar:Prudêncio, Maria Isabel
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Ruiz, Francisco
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Marques, Rosa
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Dias, Maria Isabel
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Rodriguez Vidal, Joaquín
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Rodrigues, Ana Luisa
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Cáceres, Luis Miguel
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González-Regalado, María Luz
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Muñoz, Juan Manuel
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Pozo Rodríguez, Manuel
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Gómez, Paula
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Toscano, Antonio
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Abad, Manuel
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Izquierdo, Tatiana
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Arroyo, Marta
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Romero, Verónica
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Gómez, Gabriel
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