Patterns of rare earth and other trace elements in Paleogene and Miocene clayey sediments from the Mondego platform (Central Portugal) |
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| Institution: | 1. Laboratório Nacional de Energia e Geologia, I.P. (LNEG), Portugal;2. Geobiotec, Geosciences Dep., Univ. Aveiro, 3810-193 Aveiro, Portugal;1. Institute of Mineralogy, Freiberg University of Mining and Technology, Brennhausgasse 14, 09596 Freiberg, Germany;2. Helmholtz-Institut Freiberg für Ressourcentechnologie, Halsbrücker Straße 34, 09599 Freiberg, Germany;1. Institute of Energy Systems, Faculty of Mechanical Engineering, Technische Universität München, Boltzmannstra ße 15, 85748 Garching, Germany;2. The Bavarian Center for Applied Energy Research (ZAE Bayern), Division 1: Technology for Energy Systems and Renewable Energy, Walther-Meissner-Str. 6, 85748 Garching, Germany;1. Institute of Cybernetics at Tallinn University of Technology, Akadeemia tee 21, Tallinn 12618, Estonia;2. Embry-Riddle Aeronautical University, 600 S. Clyde Morris Boulevard, Daytona Beach, FL 32114, USA;1. Dipartimento di Matematica “Guido Castelnuovo”, SAPIENZA Università di Roma, P.le A. Moro 5, 00185 Roma, Italy;2. Dipartimento di Matematica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy;3. DICATAM, Sezione di Matematica, Università degli studi di Brescia, Via Branze, 38, 25123 Brescia, Italy;1. Laboratoire CRISMAT, ENSICAEN UMR6508, 6 Bd Maréchal Juin, Cedex 4, Caen 14050, France;2. Department of Chemistry, Institute of Natural Sciences, Ural Federal University, Lenin av. 51, Yekaterinburg 620000, Russia;1. Dipartimento di Scienze della Terra, University of Rome “La Sapienza”, Piazzale A. Moro 5, I-00185 Rome, Italy;2. IGAG – Istituto di Geologia Ambientale e Geoingegneria – CNR c/o Dipartimento di Scienze della Terra, University of Rome “La Sapienza”, Piazzale A. Moro 5, I-00185 Rome, Italy |
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| Abstract: | In the present study the origin of clay deposits occurring in an inland platform, in central Portugal, was investigated by their mineralogical and chemical composition. The clay deposits, exploited for ceramic industry are composed of silt-clay facies, the Monteira Member and the Arroça Member, which are assigned to the Coja Formation (Paleogene) and the Campelo Formation (Miocene), respectively. These clayey facies show almost compositional homogeneity, especially concerning texture. The mineralogical composition of the Monteira Member displays slightly higher content in smectite and interstratified clay minerals, which is supported by the chemical composition of samples analyzed. Both members present similar REE patterns, displaying an intense weathering record and little variation in the source area composition. Minor element geochemistry suggests low content in heavy minerals and transition metals. REE patterns and ratios of geochemical parameters support the dominant metasedimentary provenance, with a granite source contribution and also mature recycled sediments of continental origin. The study results’ suggest that the clays of these two members have the same source in terms of lithology and recycled sediments from the Hesperian massif. During the deposition of the Arroça Member, a major remobilization of the Monteira Member is suggested, explaining the geochemical similarity of both facies. |
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| Keywords: | Clay Rare earth elements Trace elements Monteira Member Arroça Member Provenance |
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