32 documents found, page 1 of 4
Natural Hydrogen Prospectivity in Portugal: A first approach
Portillo, Juan C. C.; Ferreira, Pedro Tavares; Sampaio, José; Batista, Maria Joao; Represas, Patricia; Ramalho, Elsa; Machado, Susana; Carvalho, JoãoABSTRACT: This works presents the first maps of the prospectivity of natural hydrogen in continental Portugal and the methodological approach undertaken. The methodology used in this study follows the Chance of Sufficiency (COS) approach, which is also sometimes referred as the Chance of Success in exploration geoscience. It is a probabilistic estimate of whether a geological prospect contains a resource (e.g.,...
Detailed in-depth mapping of the world largest anorthositic complex: Magnetic a...
Merino-Martínez, E.; Rey-Moral, Carmen; Machadinho, Ana; Carvalho, João; Represas, Patricia; García-Lobón, J. L.; Feria, María CarmenABSTRACT: The Kunene Complex (KC) represents a very large Mesoproterozoic igneous body, mainly composed of anorthosites and gabbroic rocks that extends from SW Angola to NW Namibia (outcropping 18,000 km2 , NE-SW trend, and ca. 350 km long and up to 50 km wide). Little is known about its structure at depth. Here, we use recently acquired aerogeophysical data to accurately determine its hidden extent and to unra...
Age dependent variation of the magnetic fabric of dike swarms and implications ...
Moreira, Mário; Mata, João; Madeira, José; Represas, Patricia; Martins, SofiaABSTRACT: Magnetic fabric analysis of dikes is a powerful technique when assessing magma transfer processes. This study presents an integrated analysis combining magnetic susceptibility and anisotropy of magnetic susceptibility, magnetic mineralogy, geochemistry and new 40Ar/39 Ar dating of dikes intruding formations ranging from the Lower Cretaceous to the Miocene on the island of Maio, in the Cabo Verde archi...
3D Magnetic Inversion in Angola: Serra da Neve Alkaline Complex and Jamba Itabi...
Machadinho, Ana; Represas, Patricia; Alves, Daniela; Cordeiro, Domingos; Carvalho, João; Lopes, R.; Caessa, Paulo; Pereira, L. F; Osório, A.ABSTRACT: Demanding and speculative economies make it imperative to search for new areas of mineral exploration. Angola’s geological diversity presents an enormous potential for mineral resources. This potential can be assessed by applying different methods, such as geophysical prospecting, to discover new potential targets of areas to explore. For many years, the magnetic method has been successfully used in m...
AfricaMaVal : Mineral Potential Mapping Study of European Critical Raw Material...
Fullgraf, Thomas; Marques Prazeres, Cátia; Gonçalves, Pedro; Callec, Yannick; Fortes, Carla; Represas, Patricia; Vella, Alex; Guillaneau, Jean-ClaudeABSTRACT: The AfricaMaVal project, a 3.5-year initiative coordinated by the French Geological Survey (BRGM), fosters sustainable EU–Africa partnerships in the critical raw materials (CRM) sector. With 18 partners from 11 countries, it promotes responsible mineral sourcing for European industries while supporting Africa’s sustainable development. Work Package 1 (WP1), “Supply Potential,” led by the Portuguese Ge...
Estudos Geofísicos na Perspetiva de Otimização do Local de uma Captação Geotérm...
Ferreira Gomes, L. M.; Ramalho, Elsa; Carvalho, João; Sampaio, José; Francés, Alain Pascal; Represas, Patricia; Marques, Fábio; Morais, IgorRESUMO: As alterações climáticas têm gerado impactos significativos nos territórios termais, tanto de forma direta, por diminuição, desde logo, da recarga dos sistemas aquíferos, e indiretamente através da intensificação da procura de recursos hídricos subterrâneos e da transformação dos usos do solo, fatores que, em conjunto, podem comprometer a qualidade e a disponibilidade dos recursos hidrominerais e geotér...
Modelización magnética del Complejo de Cunene (SW Angola) [Resumo]
Mochales, Tania; Merino-Martínez, E.; Rey-Moral, Carmen; Machadinho, Ana; Carvalho, João; Represas, Patricia; García-Lobón, J. L.; Feria, María CarmenRESUMEN: El Complejo de Cunene (CC) representa un extenso macizo ígneo mesoproterozoico compuesto por rocas anortosíticas, gabroicas y ácidas contemporáneas, que aflora 18.000 km2 en dirección NNE-SSW desde el SW de Angola al NW de Namibia. Se han interpretado y modelizado en 2,5/3D los datos aerogeofísicos obtenidos en el proyecto PLANAGEO para investigar los límites no expuestos del CC, reconstruyendo la estr...
Geophysical characterization of the Cercal Paleozoic structure, Iberian Pyrite ...
Feitoza, L. M.; Carvalho, João; Represas, Patricia; Ramalho, Elsa; Sousa, Pedro; Matos, João Xavier; Albardeiro, Luís; Morais, IgorABSTRACT: The Cercal Volcano-Sedimentary Complex (Cercal VSC) structure is the westernmost sector of the Iberian Pyrite Belt (IPB) giant metallogenic province and was explored since Roman times for volcanogenic massive sulphides (VMS) and Fe–Mn (Ba) deposits. However, presently only a single deposit is known, the Salgadinho Cu-Ag-Au stockwork/disseminated deposit. Nevertheless, according to several mining compa...
Modelización magnética del Complejo de Cunene (SW Angola) [Resumo]
Mochales, Tania; Merino-Martínez, E.; Rey-Moral, Carmen; Machadinho, Ana; Carvalho, João; Represas, Patricia; García-Lobón, J. L.; Feria, María CarmenRESUMEN: El Complejo de Cunene (CC) representa un extenso macizo ígneo mesoproterozoico compuesto por rocas anortosíticas, gabroicas y ácidas contemporáneas, que aflora 18.000 km2 en dirección NNE-SSW desde el SW de Angola al NW de Namibia. Se han interpretado y modelizado en 2,5/3D los datos aerogeofísicos obtenidos en el proyecto PLANAGEO para investigar los límites no expuestos del CC, reconstruyendo la estr...
Geophysical characterization of the Cercal Paleozoic structure, Iberian Pyrite ...
Feitoza, L. M.; Carvalho, João; Represas, Patricia; Ramalho, Elsa; Sousa, Pedro; Matos, João Xavier; Albardeiro, Luís; Morais, IgorABSTRACT: The Cercal Volcano-Sedimentary Complex (Cercal VSC) structure is the westernmost sector of the Iberian Pyrite Belt (IPB) giant metallogenic province and was explored since Roman times for volcanogenic massive sulphides (VMS) and Fe–Mn (Ba) deposits. However, presently only a single deposit is known, the Salgadinho Cu-Ag-Au stockwork/disseminated deposit. Nevertheless, according to several mining compa...