Geochemistry and Fe speciation in active volcanic environments – the case of Fogo Island, Cape Verde
Topsoils developed in different geological formations/ages, and the top layer of the lava flow from the most recent eruption (2014/2015) of Fogo Island (Cape Verde archipelago), were studied. The specific objectives of this work are: i) to estimate the REE contents and patterns in the whole sample o...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2019-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_06009.pdf |
| _version_ | 1819133011011043328 |
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| author | Marques Rosa Vieira Bruno J.C. Prudêncio Maria Isabel Waerenborgh João Carlos Dias Maria Isabel Russo Dulce Rocha Fernando Silva Teresa Ruiz Francisco |
| author_facet | Marques Rosa Vieira Bruno J.C. Prudêncio Maria Isabel Waerenborgh João Carlos Dias Maria Isabel Russo Dulce Rocha Fernando Silva Teresa Ruiz Francisco |
| author_sort | Marques Rosa |
| collection | DOAJ |
| description | Topsoils developed in different geological formations/ages, and the top layer of the lava flow from the most recent eruption (2014/2015) of Fogo Island (Cape Verde archipelago), were studied. The specific objectives of this work are: i) to estimate the REE contents and patterns in the whole sample of topsoils developed on different geological formations/ages and their correlation with the iron speciation; and ii) to study the top layer of a lava flow from the most recent eruption after two years of exposure. REE contents are in general higher in the topsoils of the pre-caldera than in those developed on the post-caldera formation, particularly the light REE probably due to their incorporation into hematite. Positive Eu anomalies found in recent topsoils suggest the existence of hydrothermal processes with intrusion of hot fluids with higher concentration of Eu2+. In the top layer of the lava flow of the most recent eruption, Fe is incorporated in pyroxenes and iron oxides (magnetite and/or maghemite). This study can be a benchmark for further knowledge of the chemical evolution and weathering rate in semi-arid climate of Fogo Island. |
| first_indexed | 2024-12-22T09:40:30Z |
| format | Article |
| id | doaj.art-346da4cc6acb4c41898f6050822b3552 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-22T09:40:30Z |
| publishDate | 2019-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-346da4cc6acb4c41898f6050822b35522022-12-21T18:30:42ZengEDP SciencesE3S Web of Conferences2267-12422019-01-01980600910.1051/e3sconf/20199806009e3sconf_wri-162018_06009Geochemistry and Fe speciation in active volcanic environments – the case of Fogo Island, Cape VerdeMarques Rosa0Vieira Bruno J.C.1Prudêncio Maria Isabel2Waerenborgh João Carlos3Dias Maria Isabel4Russo Dulce5Rocha FernandoSilva Teresa6Ruiz Francisco7Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de LisboaCentro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de LisboaCentro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de LisboaCentro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de LisboaCentro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de LisboaCentro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de LisboaUnidade de Recursos Minerais e Geofísica, LNEGDepartamento de Ciencias de la Tierra, Universidad de HuelvaTopsoils developed in different geological formations/ages, and the top layer of the lava flow from the most recent eruption (2014/2015) of Fogo Island (Cape Verde archipelago), were studied. The specific objectives of this work are: i) to estimate the REE contents and patterns in the whole sample of topsoils developed on different geological formations/ages and their correlation with the iron speciation; and ii) to study the top layer of a lava flow from the most recent eruption after two years of exposure. REE contents are in general higher in the topsoils of the pre-caldera than in those developed on the post-caldera formation, particularly the light REE probably due to their incorporation into hematite. Positive Eu anomalies found in recent topsoils suggest the existence of hydrothermal processes with intrusion of hot fluids with higher concentration of Eu2+. In the top layer of the lava flow of the most recent eruption, Fe is incorporated in pyroxenes and iron oxides (magnetite and/or maghemite). This study can be a benchmark for further knowledge of the chemical evolution and weathering rate in semi-arid climate of Fogo Island.https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_06009.pdf |
| spellingShingle | Marques Rosa Vieira Bruno J.C. Prudêncio Maria Isabel Waerenborgh João Carlos Dias Maria Isabel Russo Dulce Rocha Fernando Silva Teresa Ruiz Francisco Geochemistry and Fe speciation in active volcanic environments – the case of Fogo Island, Cape Verde E3S Web of Conferences |
| title | Geochemistry and Fe speciation in active volcanic environments – the case of Fogo Island, Cape Verde |
| title_full | Geochemistry and Fe speciation in active volcanic environments – the case of Fogo Island, Cape Verde |
| title_fullStr | Geochemistry and Fe speciation in active volcanic environments – the case of Fogo Island, Cape Verde |
| title_full_unstemmed | Geochemistry and Fe speciation in active volcanic environments – the case of Fogo Island, Cape Verde |
| title_short | Geochemistry and Fe speciation in active volcanic environments – the case of Fogo Island, Cape Verde |
| title_sort | geochemistry and fe speciation in active volcanic environments the case of fogo island cape verde |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_06009.pdf |
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