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Geosciences
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Rare Earth Elements (REEs) in Fluvial Sediments
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Rare Earth Elements (REEs) in Fluvial Sediments

A special issue of Geosciences (ISSN 2076-3263). This special issue belongs to the section "Geochemistry".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 5413

Special Issue Editor

Dr. Pedro Dinis

E-Mail Website
Guest Editor
MARE—Marine and Environmental Sciences Centre, Department of Earth Sciences, University of Coimbra, Rua Sílvio Lima, 3030-790 Coimbra, Portugal
Interests: clastic sedimentology; factors that control sediment composition; climate and weathering transformations; provenance studies; paleogeographic reconstructions; geological mapping

Special Issue Information

Dear Colleagues,

We are preparing a Special Issue for the Journal Geosciences focused on the exogenous factors that influence REEs (Rare Earth Elements) concentrations in fluvial sediments. REEs are a group of elements that has received major attention during the last few decades, namely because of their application in new technologies. In addition, REE patterns are frequently used in tracing the source of sedimentary deposits, especially in fine-grained units, for which other tools for provenance research cannot be adopted. REE concentrations are influenced by several exogenous processes. For example, weathering may not affect all REE in the same way, and the absolute concentration of different elements strongly depends on the sorting process, which rules the abundances of different clay and heavy minerals that host most REEs. It is also recognised that human activities account for the introduction of some REE in the environment. Understanding the processes taking place in the surface continental environments that influence REE concentrations has wide implications for paleogeographic reconstructions, environment studies and economic geology.

Dr. Pedro Dinis
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Geosciences is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Rare earth elements
  • REEs as provenance indicators
  • Weathering
  • Sorting
  • Pollution tracers

Published Papers (2 papers)

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Research

11 pages, 1790 KiB  
Article
Patterns and Abundance of Rare Earth Elements in Sediments of a Bedrock River (Miño River, NW Iberian Peninsula)
by Miguel Ángel Álvarez-Vázquez, Elena De Uña-Álvarez and Ricardo Prego
Geosciences 2022, 12(3), 105; https://doi.org/10.3390/geosciences12030105 - 24 Feb 2022
Cited by 4 | Viewed by 2282
Abstract
Bedrock rivers, whose sedimentary geochemistry has been scarcely investigated, are suitable to test geochemical approaches in order to assess the existence and extent of human alterations in the natural abundance of rare earth elements. This work presents the study of REE contents in [...] Read more.
Bedrock rivers, whose sedimentary geochemistry has been scarcely investigated, are suitable to test geochemical approaches in order to assess the existence and extent of human alterations in the natural abundance of rare earth elements. This work presents the study of REE contents in fine-grained sediments of the (bedrock) Miño River, in an urban reach of its middle course. Different statistical procedures were employed in order to decipher the abundances and patterns of distribution of REE in different environments, showing a higher REE accumulation in surface sediments trapped by potholes and other rock cavities. Background contents were estimated by iterative simple regression. After checking several possible reference elements, Y showed the highest potential for the series of REE from La to Lu. The regression result, namely background function, is very useful to minimize the effect of the natural variability in sediment contents. Background functions also allow for environmental assessment by the calculation of the so-called local enrichment factors. As a general conclusion, contamination, if it exists, is negligible in the area and low enrichments can be attributed to postdepositional processes related to organic matter and the geochemistry of Fe and Mn. Full article
(This article belongs to the Special Issue Rare Earth Elements (REEs) in Fluvial Sediments)
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18 pages, 5456 KiB  
Article
Influence of Sediment Cycling on the Rare-Earth Element Geochemistry of Fluvial Deposits (Caculuvar–Mucope, Cunene River Basin, Angola)
by Armanda Cruz, Pedro A. Dinis, Alberto Gomes and Paula Leite
Geosciences 2021, 11(9), 384; https://doi.org/10.3390/geosciences11090384 - 11 Sep 2021
Cited by 6 | Viewed by 2261
Abstract
The rare-earth element (REE) geochemistry of sedimentary deposits has been used in provenance investigations despite the transformation that this group of elements may suffer during a depositional cycle. In the present investigation, we used the geochemistry and XRD mineralogy of a set of [...] Read more.
The rare-earth element (REE) geochemistry of sedimentary deposits has been used in provenance investigations despite the transformation that this group of elements may suffer during a depositional cycle. In the present investigation, we used the geochemistry and XRD mineralogy of a set of sand and mud fluvial deposits to evaluate the ability of REE parameters in provenance tracing, and the changes in REE geochemistry associated with weathering and sorting. The analyzed deposits were generated in a subtropical drainage basin where mafic and felsic units are evenly represented, and these crystalline rocks are covered by sedimentary successions in a wide portion of the basin. A few element ratios appear to hold robust information about primary sources (Eu/Y, Eu/Eu*, LaN/YbN, LaN/SmN, and GdN/YbN), and the provenance signal is best preserved in sand than in mud deposits. Sediment cycles, however, change the REE geochemistry, affecting mud and sand deposits differently. They are responsible for significant REE depletion through quartz dilution in sands and may promote discernible changes in REE patterns in muds (e.g., increase in Ce content and some light REE depletion relative to heavy REE). Full article
(This article belongs to the Special Issue Rare Earth Elements (REEs) in Fluvial Sediments)
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