Rare Earth Elements abundance, fractionation, and anomalies in the sediments of the Cananéia-Iguape Estuarine-Lagoon Complex in Brazil
The Cananéia-Iguape Estuarine-Lagoon Complex (CIELC) is an extremely productive coastal ecosystem. It encloses the Valo Grande channel, built 160 years ago, which introduces water from the Ribeira River directly into the estuarine system, contributing to important biogeochemical changes in the regi...
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Instituto Oceanográfico da Universidade de São Paulo
2024-04-01
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| Series: | Ocean and Coastal Research |
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| Online Access: | https://www.journals.usp.br/ocr/article/view/222828 |
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| author | Vitor G. Chiozzini Deborah I. T. Fávaro Elisabete S. Braga |
| author_facet | Vitor G. Chiozzini Deborah I. T. Fávaro Elisabete S. Braga |
| author_sort | Vitor G. Chiozzini |
| collection | DOAJ |
| description |
The Cananéia-Iguape Estuarine-Lagoon Complex (CIELC) is an extremely productive coastal ecosystem. It encloses
the Valo Grande channel, built 160 years ago, which introduces water from the Ribeira River directly into the estuarine
system, contributing to important biogeochemical changes in the region. Many nutrients arrive at the estuary through
this channel, as well as metals and other slightly soluble elements that become part of the sediments. This study
aims to evaluate the processes that govern the distribution of rare earth elements (REE) in the sediments of the
complex by using fractionation patterns, anomalies, and the geochemical signature of minerals to evaluate sources,
natural levels, and the possible anthropogenic forcing to which CIELC is subjected. ∑REE* ranged from 14.2 to 285
mg kg-1 and showed a distribution related to depositional/textural characteristics influenced by the regional and local
lithological setting and a possible contamination. The REE/Al ratio indicated enrichment in the sea adjacent to the
estuary and at stations in the Ribeira River and Valo Grande. While the Hf/Al ratio indicated natural enrichment related
to the presence of heavy minerals in most of these stations, this ratio fails to justify enrichment at some stations in
the northern part of the estuary and the Ribeira River. Fractionation patterns and anomalies allowed us to identify
the main heavy minerals related to REE enrichment at CIELC. Cerium (Ce) anomalies showed a possible relation
with biologically mediated Ce+3 to Ce+4 oxidation processes in the most productive areas of the estuary. Europium
(Eu) anomalies were strongly associated with different mineral assemblies in several CIELC sectors. Abundance,
fractionation patterns, and REE anomalies corroborate the categorization of CIELC sediments as part of a pristine
system in its southern region and as subject to anthropogenic influences in its northern area.
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| format | Article |
| id | doaj-art-1d20133db118457e95e649922ee02d3c |
| institution | DOAJ |
| issn | 2675-2824 |
| language | English |
| publishDate | 2024-04-01 |
| publisher | Instituto Oceanográfico da Universidade de São Paulo |
| record_format | Article |
| series | Ocean and Coastal Research |
| spelling | doaj-art-1d20133db118457e95e649922ee02d3c2025-08-20T02:55:52ZengInstituto Oceanográfico da Universidade de São PauloOcean and Coastal Research2675-28242024-04-0171Suppl. 1Rare Earth Elements abundance, fractionation, and anomalies in the sediments of the Cananéia-Iguape Estuarine-Lagoon Complex in BrazilVitor G. ChiozziniDeborah I. T. FávaroElisabete S. Braga The Cananéia-Iguape Estuarine-Lagoon Complex (CIELC) is an extremely productive coastal ecosystem. It encloses the Valo Grande channel, built 160 years ago, which introduces water from the Ribeira River directly into the estuarine system, contributing to important biogeochemical changes in the region. Many nutrients arrive at the estuary through this channel, as well as metals and other slightly soluble elements that become part of the sediments. This study aims to evaluate the processes that govern the distribution of rare earth elements (REE) in the sediments of the complex by using fractionation patterns, anomalies, and the geochemical signature of minerals to evaluate sources, natural levels, and the possible anthropogenic forcing to which CIELC is subjected. ∑REE* ranged from 14.2 to 285 mg kg-1 and showed a distribution related to depositional/textural characteristics influenced by the regional and local lithological setting and a possible contamination. The REE/Al ratio indicated enrichment in the sea adjacent to the estuary and at stations in the Ribeira River and Valo Grande. While the Hf/Al ratio indicated natural enrichment related to the presence of heavy minerals in most of these stations, this ratio fails to justify enrichment at some stations in the northern part of the estuary and the Ribeira River. Fractionation patterns and anomalies allowed us to identify the main heavy minerals related to REE enrichment at CIELC. Cerium (Ce) anomalies showed a possible relation with biologically mediated Ce+3 to Ce+4 oxidation processes in the most productive areas of the estuary. Europium (Eu) anomalies were strongly associated with different mineral assemblies in several CIELC sectors. Abundance, fractionation patterns, and REE anomalies corroborate the categorization of CIELC sediments as part of a pristine system in its southern region and as subject to anthropogenic influences in its northern area. https://www.journals.usp.br/ocr/article/view/222828REE GeochemistryEstuarine RAMSAR AreaTrace MetalsBiogeochemistryPhosphogypsum |
| spellingShingle | Vitor G. Chiozzini Deborah I. T. Fávaro Elisabete S. Braga Rare Earth Elements abundance, fractionation, and anomalies in the sediments of the Cananéia-Iguape Estuarine-Lagoon Complex in Brazil Ocean and Coastal Research REE Geochemistry Estuarine RAMSAR Area Trace Metals Biogeochemistry Phosphogypsum |
| title | Rare Earth Elements abundance, fractionation, and anomalies in the sediments of the Cananéia-Iguape Estuarine-Lagoon Complex in Brazil |
| title_full | Rare Earth Elements abundance, fractionation, and anomalies in the sediments of the Cananéia-Iguape Estuarine-Lagoon Complex in Brazil |
| title_fullStr | Rare Earth Elements abundance, fractionation, and anomalies in the sediments of the Cananéia-Iguape Estuarine-Lagoon Complex in Brazil |
| title_full_unstemmed | Rare Earth Elements abundance, fractionation, and anomalies in the sediments of the Cananéia-Iguape Estuarine-Lagoon Complex in Brazil |
| title_short | Rare Earth Elements abundance, fractionation, and anomalies in the sediments of the Cananéia-Iguape Estuarine-Lagoon Complex in Brazil |
| title_sort | rare earth elements abundance fractionation and anomalies in the sediments of the cananeia iguape estuarine lagoon complex in brazil |
| topic | REE Geochemistry Estuarine RAMSAR Area Trace Metals Biogeochemistry Phosphogypsum |
| url | https://www.journals.usp.br/ocr/article/view/222828 |
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