REE Anomalies Changes in Bottom Sediments Applied in the Western Equatorial Atlantic Since the Last Interglacial
We reconstruct paleoredox conditions in the Western Equatorial Atlantic (WEA) over the glacial-interglacial cycle (~130 ka) by using new high-resolution REEs data and their anomalies from a marine sediment core (GL-1248) collected from the equatorial margin off the continental shelf of NE Brazil. Th...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-05-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.846976/full |
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| author | Thiago A. Sousa Igor Martins Venancio Eduardo Duarte Marques Thiago S. Figueiredo Rodrigo Azevedo Nascimento Joseph M. Smoak Ana Luiza S. Albuquerque Claudio Morisson Valeriano Claudio Morisson Valeriano Emmanoel Vieira Silva-Filho |
| author_facet | Thiago A. Sousa Igor Martins Venancio Eduardo Duarte Marques Thiago S. Figueiredo Rodrigo Azevedo Nascimento Joseph M. Smoak Ana Luiza S. Albuquerque Claudio Morisson Valeriano Claudio Morisson Valeriano Emmanoel Vieira Silva-Filho |
| author_sort | Thiago A. Sousa |
| collection | DOAJ |
| description | We reconstruct paleoredox conditions in the Western Equatorial Atlantic (WEA) over the glacial-interglacial cycle (~130 ka) by using new high-resolution REEs data and their anomalies from a marine sediment core (GL-1248) collected from the equatorial margin off the continental shelf of NE Brazil. This approach aims to improve the understanding of the dynamics of paleoclimatic and sedimentary inputs on the coast of northeastern Brazil. Marine sediments were analyzed via Mass Spectrometry (ICP-MS) after total digestion with HF/HNO3. REEs proxies are a useful tool in understanding the transport and origin of sediments due to their physicochemical properties. Our data showed the Parnaíba River was the main source of REEs content in the western South Atlantic. Fe minerals (Fe-oxyhydroxides) produced via weathering of continental and tropical soils were the principal REE-carrier phase during transportation and ultimate deposition at core site GL-1248. Several regional climatic factors mainly rainfall changes contributed significantly to continental-REEs erosion of sedimentary layers of the Parnaíba Basin, and transport and deposition of the mobilized REEs from the continent to the study site. Furthermore, changes in the negative Ce-anomaly showed low variation along the core indicating a reduction in deep ocean oxygenation during the interglacial relative to the last glacial period. That variation, probably, was associated with glacial-interglacial variations in sea level with the exposure of the continental shelf. The origin of positive Eu anomalies in siliciclastic sediment, also observed in the core, was explained by preferential retention by feldspars such as plagioclases and potassium feldspars mostly from the assimilation of felspar during fractionation crystallization of felsic magma in the Parnaíba basin since the Last Interglacial. |
| first_indexed | 2024-04-12T11:21:29Z |
| format | Article |
| id | doaj.art-d696b9b01b3346fe86de5ef9c2a7ae5c |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-12T11:21:29Z |
| publishDate | 2022-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-d696b9b01b3346fe86de5ef9c2a7ae5c2022-12-22T03:35:22ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-05-01910.3389/fmars.2022.846976846976REE Anomalies Changes in Bottom Sediments Applied in the Western Equatorial Atlantic Since the Last InterglacialThiago A. Sousa0Igor Martins Venancio1Eduardo Duarte Marques2Thiago S. Figueiredo3Rodrigo Azevedo Nascimento4Joseph M. Smoak5Ana Luiza S. Albuquerque6Claudio Morisson Valeriano7Claudio Morisson Valeriano8Emmanoel Vieira Silva-Filho9Geoscience (Geochemistry) Graduate Program (Environmental Geochemistry), Fluminense Federal University, Niterói, BrazilGeoscience (Geochemistry) Graduate Program (Environmental Geochemistry), Fluminense Federal University, Niterói, BrazilGeological Survey of Brazil (SGB/CPRM), Belo Horizonte Regional Office, Belo Horizonte, BrazilGeoscience (Geochemistry) Graduate Program (Environmental Geochemistry), Fluminense Federal University, Niterói, BrazilGeoscience (Geochemistry) Graduate Program (Environmental Geochemistry), Fluminense Federal University, Niterói, BrazilSchool of Geosciences, University of South Florida, St. Petersburg, FL, United StatesGeoscience (Geochemistry) Graduate Program (Environmental Geochemistry), Fluminense Federal University, Niterói, BrazilSchool of Geosciences, University of South Florida, St. Petersburg, FL, United StatesTektos - Geotectonic Research Group of the Faculty of Geology, State University of Rio de Janeiro (UERJ), Rio de Janeiro, BrazilGeoscience (Geochemistry) Graduate Program (Environmental Geochemistry), Fluminense Federal University, Niterói, BrazilWe reconstruct paleoredox conditions in the Western Equatorial Atlantic (WEA) over the glacial-interglacial cycle (~130 ka) by using new high-resolution REEs data and their anomalies from a marine sediment core (GL-1248) collected from the equatorial margin off the continental shelf of NE Brazil. This approach aims to improve the understanding of the dynamics of paleoclimatic and sedimentary inputs on the coast of northeastern Brazil. Marine sediments were analyzed via Mass Spectrometry (ICP-MS) after total digestion with HF/HNO3. REEs proxies are a useful tool in understanding the transport and origin of sediments due to their physicochemical properties. Our data showed the Parnaíba River was the main source of REEs content in the western South Atlantic. Fe minerals (Fe-oxyhydroxides) produced via weathering of continental and tropical soils were the principal REE-carrier phase during transportation and ultimate deposition at core site GL-1248. Several regional climatic factors mainly rainfall changes contributed significantly to continental-REEs erosion of sedimentary layers of the Parnaíba Basin, and transport and deposition of the mobilized REEs from the continent to the study site. Furthermore, changes in the negative Ce-anomaly showed low variation along the core indicating a reduction in deep ocean oxygenation during the interglacial relative to the last glacial period. That variation, probably, was associated with glacial-interglacial variations in sea level with the exposure of the continental shelf. The origin of positive Eu anomalies in siliciclastic sediment, also observed in the core, was explained by preferential retention by feldspars such as plagioclases and potassium feldspars mostly from the assimilation of felspar during fractionation crystallization of felsic magma in the Parnaíba basin since the Last Interglacial.https://www.frontiersin.org/articles/10.3389/fmars.2022.846976/fullRare Earth Elementsglacial-interglacialweatheringParnaíba Basinsea levelNortheast Brazil |
| spellingShingle | Thiago A. Sousa Igor Martins Venancio Eduardo Duarte Marques Thiago S. Figueiredo Rodrigo Azevedo Nascimento Joseph M. Smoak Ana Luiza S. Albuquerque Claudio Morisson Valeriano Claudio Morisson Valeriano Emmanoel Vieira Silva-Filho REE Anomalies Changes in Bottom Sediments Applied in the Western Equatorial Atlantic Since the Last Interglacial Frontiers in Marine Science Rare Earth Elements glacial-interglacial weathering Parnaíba Basin sea level Northeast Brazil |
| title | REE Anomalies Changes in Bottom Sediments Applied in the Western Equatorial Atlantic Since the Last Interglacial |
| title_full | REE Anomalies Changes in Bottom Sediments Applied in the Western Equatorial Atlantic Since the Last Interglacial |
| title_fullStr | REE Anomalies Changes in Bottom Sediments Applied in the Western Equatorial Atlantic Since the Last Interglacial |
| title_full_unstemmed | REE Anomalies Changes in Bottom Sediments Applied in the Western Equatorial Atlantic Since the Last Interglacial |
| title_short | REE Anomalies Changes in Bottom Sediments Applied in the Western Equatorial Atlantic Since the Last Interglacial |
| title_sort | ree anomalies changes in bottom sediments applied in the western equatorial atlantic since the last interglacial |
| topic | Rare Earth Elements glacial-interglacial weathering Parnaíba Basin sea level Northeast Brazil |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.846976/full |
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