E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||5|
|Section||Geochemical Cycles of Elements and Global Environmental Changes|
|Published online||07 June 2019|
Geochemistry and Fe speciation in active volcanic environments – the case of Fogo Island, Cape Verde
Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa, EN10 (139.7 km), 2695-066 Bobadela, Portugal
2 GeoBioTec, Univ. de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
3 Dep. Geociências, Univ. de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
4 Unidade de Recursos Minerais e Geofísica, LNEG, Estrada da Portela, Amadora, Portugal
5 Departamento de Ciencias de la Tierra, Universidad de Huelva, Huelva, Spain
* Corresponding author: firstname.lastname@example.org
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.
© The Authors, published by EDP Sciences, 2019
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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