RT Conference Proceedings
T1 Paleoenvironmental considerations based on geochemistry and mineralogy of a Miocene lacustrine calcrete, southern Portugal
A1 Rodrigues, Ana Luisa
A1 Dias, María Isabel
A1 Prudencio, María Isabel
A1 Rocha, Fernando
A1 Ruiz Muñoz, Francisco
A1 Marques, Rosa
A1 González-Regalado Montero, María Luz
A1 Russo, Dulce
A1 Cardoso, Guilherme
AB A lacustrine carbonate facies has been investigated in Middle Miocene successions of the western side of the Moura-Marmelar basin, Southern Portugal in order to evaluate paleoenvironments in which carbonates formed, by using geochemistry and mineralogy. The studied formation corresponds to a recent unearthed section of a calcrete with an homogeneous carbonate facies comprising fine, whitish, and powdery material, and the only detected difference is a slightly hardness decrease towards the top, as well as an increase of weathered rock fragments (schist). The calcrete is calcium rich, even some magnesium enrichment was observed at the middle level, which is differentiated by a general depletion of all chemical elements, particularly REE, in both the bulk and clay-size fraction. Regarding the mineralogy, calcite prevails, and dolomite is only present in the middle level of the calcrete, together with a smectite enrichment, suggesting changes to more alkaline and low drainage, lacustrine and arid to semi-arid conditions.
PB EDP Sciences
SN 2267-1242 (electrónico)
YR 2019
FD 2019-06
LK https://hdl.handle.net/10272/25353
UL https://hdl.handle.net/10272/25353
LA eng
NO Rodrigues, A. L., Dias, M. I., Prudêncio, M. I., Rocha, F., Ruiz Muñoz, F., Marques, R., González-Regalado, M.L., Russo, D., & Cardoso, G. (2019). Paleoenvironmental considerations based on geochemistry and mineralogy of a Miocene lacustrine calcrete, southern Portugal. In O. Chudaev, Y. Kharaka, R. Harmon, R. Millot, & O. Shouakar-Stash (Eds.), E3S Web of Conferences (Vol. 98, p. 06012). EDP Sciences. https://doi.org/10.1051/e3sconf/20199806012
NO The authors would like to thank the financial support by Fundação para a Ciência e Tecnologia (FCT, Portugal) through the projects UID/GEO/04035/2013 and UID/Multi/04349/2013.
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026