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GEOPHYSICAL EXPLORATION IN ARGEMELA DISTRICT, FUNDAO, PORTUGAL - VLF RESULTS
Abstract
Raw materials are essential for Europe-s industrial base, as they are used to produce vital goods and technologies. The European Comission-s assessment identifies lithium and tin as critical and strategic raw materials due to rising demand. A PhD thesis aims to create a 3D geological model of the Argemela District in Central Portugal to provide vital information about the genesis of the hydrothermal tin and lithium mineralizations founded in the region. The study places emphasis on the very-low-frequency (VLF) electromagnetic method as a tool to provide information about the mineralization, lithologic contacts, and structural features that can be related to the mineralizations. Argemela district has two main areas, the Argemela Tin and Lithium Mine and the Argemela Hill Top. VLF data was collected and analyzed, showing that low resistivity may be associated with mineralization in the Argemela Mine, while high resistivity may be linked to the Argemela microgranite in the Argemela Hill Top. This geophysical method is effective in non-invasively mapping subsurface features, assisting in the development of a comprehensive 3D geological model and enhancing resource evaluation.
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References5
European Commission, Directorate-General for Internal Market, Industry, Entrepreneurship and SMEs, Grohol, M., Veeh, C. (2023). Study on the critical raw materials for the EU 2023: final report, Publications Office of the European Union. https://data.europa.eu/doi/DOI: 10.2873/725585
Inverno, C., & Ribeiro, M. L. (1980). Fracturacao e cortejo filoneano nas Minas da Argemela (Fundao). Comun. Serv. Geolo. Portugal, 66, 185-193
Charoy, B., & Noronha, F. (1996). Multistage Growth of a Rare-Element, Volatile-Rich Microgranite at Argemela (Portugal). Journal of Petrology, 37(1), 73-94. DOI: 10.1093/petrology/37.1.73
Michaud, J. (2019). Rare Metal Granites - Origin, Emplacement and Mechanisms of the Magmatic-Hydrothermal Transition. University of Orlean. Orleans, France, p. 330.
Ribeiro, R., Capela, D., Ferreira, M., Martins, R., Jorge, P., Guimaraes, D., & Lima, A. (2021). X-ray Fluorescence and Laser-Induced Breakdown Spectroscopy Analysis of Li-Rich Minerals in Veins from Argemela Tin Mine, Central Portugal. Minerals, 11(11), 1169. https://www.mdpi.com/2075-163X/11/11/1169 DOI: 10.3390/min11111169
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