{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T06:23:00Z","timestamp":1775024580775,"version":"3.50.1"},"reference-count":44,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2024,3,26]],"date-time":"2024-03-26T00:00:00Z","timestamp":1711411200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"FCT\u2014Foundation for Science and Technology","award":["UIDP\/04683\/2020"],"award-info":[{"award-number":["UIDP\/04683\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Minerals"],"abstract":"<jats:p>Potassium (K), thorium (Th), and uranium (U) are good markers of magmatic or alteration processes and the surface concentrations of these radioelements can be mapped at the regional or local scale through radiometric (gamma) surveys. In this study, a radiometric survey was performed in a post-orogenic pluton located in North Portugal, namely the Lamas de Olo Pluton, composed by three granitic facies. This pluton has already been intensively studied, including magnetic susceptibility, gravimetric, geochemical, and petrographic studies. The main objective of this work is to evaluate the radiometric data and combine them with other characteristics, such as magnetic susceptibility, and gravimetry, as well as to elucidate structures such as faults and fractures, outline geological boundaries, and identify alteration zones within various granites of the pluton. The radiometric approach reveals the spatial distribution of radioelements, offering a more distinct portrayal of the geology in the studied area. The radioactive heat production rate was calculated for the studied pluton, showing that the mean value is 4.09 \u00b5W m\u22123, surpassing the known mean values for granites. Our study highlights that radiometric measurements unveil compositional variations within granitic pluton and aid in identifying feeder zones. Furthermore, these measurements can be correlated with each type of granites, demonstrating associations with surface concentrations of K-Th-U. Our findings indicate a spatial alignment between the NE feeder root and a U-rich granite (Barragem granite), as evidenced by its elevated concentration of this radioelement. Conversely, the other root displays a notable relative concentration of Th, consistent with the Th-rich characteristics observed of the two other granites (Lamas de Olo and Alto dos Cabe\u00e7os granites).<\/jats:p>","DOI":"10.3390\/min14040342","type":"journal-article","created":{"date-parts":[[2024,3,26]],"date-time":"2024-03-26T11:34:58Z","timestamp":1711452898000},"page":"342","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A Multi-Method Approach to Geophysical Imaging of a Composite Pluton in North Portugal"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2398-4869","authenticated-orcid":false,"given":"Cl\u00e1udia","family":"Cruz","sequence":"first","affiliation":[{"name":"Departamento de Geoci\u00eancias Ambiente e Ordenamento do Territ\u00f3rio, Instituto de Ci\u00eancias da Terra\u2014P\u00f3lo Porto, Faculdade de Ci\u00eancias, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8960-7228","authenticated-orcid":false,"given":"Fernando","family":"Noronha","sequence":"additional","affiliation":[{"name":"Departamento de Geoci\u00eancias Ambiente e Ordenamento do Territ\u00f3rio, Instituto de Ci\u00eancias da Terra\u2014P\u00f3lo Porto, Faculdade de Ci\u00eancias, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1884-7440","authenticated-orcid":false,"given":"Helena","family":"Sant\u2019Ovaia","sequence":"additional","affiliation":[{"name":"Departamento de Geoci\u00eancias Ambiente e Ordenamento do Territ\u00f3rio, Instituto de Ci\u00eancias da Terra\u2014P\u00f3lo Porto, Faculdade de Ci\u00eancias, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"98","DOI":"10.1016\/j.tecto.2011.02.003","article-title":"Granite petrogenesis revealed by combined gravimetric and radiometric imaging","volume":"501","author":"Boulvais","year":"2011","journal-title":"Tectonophysics"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Dentith, M., and Mudge, S.T. (2014). Geophysics for the Mineral Exploration Geoscientist, Cambridge University Press.","DOI":"10.1017\/CBO9781139024358"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1016\/j.jafrearsci.2018.03.026","article-title":"Multi-scale distribution of Potassium. Thorium and Uranium in Paleoproterozoic granites from eastern Senegal","volume":"148","author":"Fall","year":"2018","journal-title":"J. Afr. Earth Sci."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"653","DOI":"10.1080\/08123985.2019.1659102","article-title":"Geophysical interpretation of the geology of the Stanthorpe region using aeromagnetic, gravity and radiometric data","volume":"50","author":"Kumwenda","year":"2019","journal-title":"Explor. Geophys."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"104470","DOI":"10.1016\/j.jsg.2021.104470","article-title":"Unraveling the emplacement history of a Po tuguese post-tectonic Variscan pluton using fabrics and gravimetry","volume":"153","author":"Cruz","year":"2021","journal-title":"J. Struct. Geol."},{"key":"ref_6","first-page":"13","article-title":"Granite emplacement within a suture shear zone in the Southwestern Iberian Variscan Belt: The Santa Eul\u00e1lia Plutonic Complex","volume":"180","author":"Cruz","year":"2023","journal-title":"Geol. Soc."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"262","DOI":"10.1190\/1.1439174","article-title":"Natural radioactivity in Washington County, Maryland","volume":"28","author":"Moxham","year":"1963","journal-title":"Geophysics"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1326","DOI":"10.1190\/1.1442592","article-title":"Statistical analysis of airborne gamma-ray data for geologic mapping purposes: Crixas-Itapaci area, Goias, Brazil","volume":"54","author":"Pires","year":"1989","journal-title":"Geophysics"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"H\u00e4nel, R., Rybach, L.L. (1988). Handbook of Terrestrial Heat Flow Density Determination, Kluwer.","DOI":"10.1007\/978-94-009-2847-3"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"152","DOI":"10.1016\/j.tecto.2010.05.003","article-title":"Radiogenic heat production variability of some common lithological groups and its significance to lithospheric thermal modeling","volume":"490","year":"2010","journal-title":"Tectonophysics"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"235","DOI":"10.2113\/gselements.7.4.235","article-title":"How does the continental crust get really hot?","volume":"7","author":"Clark","year":"2011","journal-title":"Elements"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.earscirev.2017.07.003","article-title":"Heat production in granitic rocks: Global analysis based on a new data compilation GRANITE2017","volume":"172","author":"Artemieva","year":"2017","journal-title":"Earth-Sci. Rev."},{"key":"ref_13","unstructured":"Strens, R.G.J. (1976). The Physics and Chemistry of Minerals and Rocks, Wiley & Sons."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1344\/GeologicaActa2020.18.5","article-title":"Magnetic mineralogy of Variscan granites from northern Portugal: An approach to their petrogenesis and metallogenic potential","volume":"18","author":"Cruz","year":"2020","journal-title":"Geol. Acta"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1007\/s41513-020-00128-x","article-title":"Geostatistical approach in the study of the magnetic susceptibility variation: Lamas de Olo Pluton case study","volume":"46","author":"Cruz","year":"2020","journal-title":"J. Iber. Geol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1016\/0040-1951(89)90088-7","article-title":"Variscan plate tectonics in Central Europe\u2013current ideas and open questions","volume":"169","author":"Franke","year":"1989","journal-title":"Tectonophysics"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Dallmeyer, R.D., and Mart\u00ednez Garcia, E. (1990). Pre-Mesozoic Geology of Iberia, Springer.","DOI":"10.1007\/978-3-642-83980-1"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"298","DOI":"10.1016\/j.gr.2013.03.001","article-title":"Two plates-Many subduction zones: The Variscan orogeny reconsidered","volume":"24","author":"Kroner","year":"2013","journal-title":"Gondwana Res."},{"key":"ref_19","first-page":"87","article-title":"Essai de corr\u2019elation des phases de d\u2019eformation hercyniennes dans le NW de la p\u2019eninsule Ib\u00e9rique","volume":"52","author":"Noronha","year":"1981","journal-title":"Leidse Geol. Meded."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1016\/S0040-1951(97)00035-8","article-title":"Diachronous Variscan tectonothermal activity in the NW Iberian Massif: Evidence from 40Ar\/39Ar dating of regional fabrics","volume":"277","author":"Dallmeyer","year":"1997","journal-title":"Tectonophysics"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1007\/s00531-006-0167-6","article-title":"SHRIMP U-Pb zircon dating of anatexis in high-grade migmatite complexes of Central Spain: Implications in the Hercynian evolution of Central Iberia","volume":"97","author":"Villaseca","year":"2008","journal-title":"Int. J. Earth Sci."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"225","DOI":"10.1144\/SP405.1","article-title":"The Late Variscan HT\/LP Metamorphic Event in NW and Central Iberia: Relationships to Crustal Thickening, Extension, Orocline Development and Crustal Evolution","volume":"405","author":"Ayarza","year":"2014","journal-title":"Geol. Soc."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1016\/j.earscirev.2016.08.002","article-title":"Tectonic evolution of variscan Iberia: Gondwana\u2013Laurussia collision revisited","volume":"162","author":"Arenas","year":"2016","journal-title":"Earth Sci. Rev."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"251","DOI":"10.1007\/s00531-017-1488-3","article-title":"S-type granite generation and emplacement during a regional switch from extensional to contractional deformation (Central Iberian Zone, Iberian autochthonous domain, Variscan Orogeny)","volume":"107","author":"Pereira","year":"2018","journal-title":"Int. J. Earth Sci."},{"key":"ref_25","unstructured":"Bea, F., Carnicero, A., Gonzalo, J., Lopez Plaza, M., and Rodriguez Alonso, M. (1987). Geolog\u00eda de los Granitoides y Rocas Asociadas del Macizo Hesperico. Libro de Homenaje a L.C. Garc\u00eda de Figuerola, Editorial Rueda."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"255","DOI":"10.1016\/S0040-1951(02)00514-0","article-title":"The Late-Variscan fault network in central\u2013northern Portugal (NW Iberia): A re-evaluation","volume":"359","author":"Marques","year":"2002","journal-title":"Tectonophysics"},{"key":"ref_27","unstructured":"Ribeiro, A. (1974). Contribution \u00e0 l\u2019\u00e9tude de Tr\u00e1s-os-Montes Oriental. Servi\u00e7os Geol\u00f3gicos de Portugal. [Ph.D. Thesis, Mem\u00f3rias Servi\u00e7os Geol\u00f3gicos de Portugal]."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1016\/0040-1951(75)90014-1","article-title":"Les d\u00e9crochements Tardi-Hercyniens du Sud-ouest de l\u2019Europe. G\u00e9ometrie et essai de reconstitution des conditions de la d\u00e9formation","volume":"25","author":"Arthaud","year":"1975","journal-title":"Tectonophysics"},{"key":"ref_29","unstructured":"Cotelo Neiva, J.M., Ribeiro, A., Victor, M., Noronha, F., and Ramalho, M. (2010). Geologia Cl\u00e1ssica, Volume I\u2014Ci\u00eancias Geol\u00f3gicas: Ensino, Investiga\u00e7\u00e3o e sua Hist\u00f3ria, Geologia Cl\u00e1ssica, Lisboa, Escolar Editora."},{"key":"ref_30","unstructured":"Pereira, E., Silva, N., Moreira, A., and Ribeiro, A. (1987). Carta Geol\u00f3gica de Portugal \u00e0 Escala 1:50,000. Folha 10-A (Celorico de Basto), Servi\u00e7os Geol\u00f3gicos de Portugal."},{"key":"ref_31","unstructured":"Helal, B. (1992). Granito\u00efdes, Granites \u00e0 M\u00e9taux Rares et Hydrothermalisme Associe: G\u00e9ologie, Min\u00e9ralogie et G\u00e9ochimie de Plusieurs suites Tardi-Hercyniennes (Nord du Portugal). [Ph.D. Thesis, Ecole Nacionale Superieure des Mines de Saint-Etienne]."},{"key":"ref_32","unstructured":"Julivert, M., Fontbot\u00e9, J.M., Ribeiro, A., and Conde, L. (1974). Mapa Tect\u00f3nico de la Pen\u00ednsula Ib\u00e9rica y Baleares a Escala 1:1,000,000 y Memoria Explicativa, Instituto Geologico y Mineiro de Espa\u00f1a."},{"key":"ref_33","unstructured":"Farias, P., Gallastegui, G., Gonz\u00e1lez Lodeiro, L., Marqu\u00ednez, J., Mart\u00edn Parra, L.M., Mart\u00ednez Catal\u00e1n, J.R., Pablo Maci\u00e1, J.G., and Rodr\u00edguez Fern\u00e1ndez, L.R. (1987). Mem\u00f3rias n\u25e61, IX Reuni\u00e3o Sobre a Geologia do Oeste Peninsular, Museu Laborat\u00e1rio Mineralogia e Geologia-Faculdade de Ci\u00eancias da Universidade do Porto, Universidad de Oporto."},{"key":"ref_34","unstructured":"Pereira, E. (1989). Not\u00edcia Explicativa da Folha 10-A (Celorico de Basto) da Carta Geol\u00f3gica de Portugal: 1:50,000, Servi\u00e7os Geol\u00f3gicos de Portugal."},{"key":"ref_35","unstructured":"Fernandes, S., Gomes, M., Teixeira, R., and Corfu, F. (2013, January 7\u201312). Geochemistry of biotite granites from the Lamas de Olo Pluton, northern Portugal. Proceedings of the Geophysical Research Abstracts, EGU General Assembly, Vienna, Austria."},{"key":"ref_36","first-page":"779","article-title":"U-Pb zircon and monazite geochronology of the Hercynian two mica granite composite pluton of Cabeceiras de Basto (Northern Portugal)","volume":"326","author":"Almeida","year":"1998","journal-title":"C. R. L\u2019acad. Sci."},{"key":"ref_37","unstructured":"Baptista, J.C., Coke, C., Dias, R., and Ribeiro, A. (1993). Tect\u00f3nica e Geomorfologia da Regi\u00e3o de Pedras Salgadas\/Vidago e as Nascentes Minerais Associadas, Comunica\u00e7\u00f5es da XII Reuni\u00e3o de Geologia do Oeste Peninsular."},{"key":"ref_38","unstructured":"Baptista, J.C. (1998). Estudo Neotect\u00f3nico da Zona de Falha Penacova-R\u00e9gua-Verin. [Ph.D. Thesis, UTAD]."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"228863","DOI":"10.1016\/j.tecto.2021.228863","article-title":"Exhumation history of the Variscan orogen in western Iberia as inferred from new K-Ar and 40Ar\/39Ar data on granites from Portugal","volume":"812","author":"Hildenbrand","year":"2021","journal-title":"Tectonophysics"},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Sant\u2019Ovaia, H., Cruz, C., Gon\u00e7alves, A., Nogueira, P., and Noronha, F. (2024). Deciphering Iberian Variscan Orogen Magmatism Using the Anisotropy of Magnetic Susceptibility from Granites. Minerals, 14.","DOI":"10.3390\/min14030309"},{"key":"ref_41","unstructured":"Batista, M.J., Leote Torres, L., Leote, J., Prazeres, C., Saraiva, J., and Carvalho, J. (2013). Carta Radiom\u00e9trica de Portugal (1:500,000), Laborat\u00f3rio de Energia e Geologia."},{"key":"ref_42","first-page":"1","article-title":"The Composition of the Continental Crust","volume":"Volume 3","author":"Holland","year":"2003","journal-title":"Treatise on Geochemistry"},{"key":"ref_43","unstructured":"Teixeira, R.J.S., Gomes, M.E.P., Martins, L.M.O., Pereira, A.J.C.S., and Neves, L.J.P.F. (2014, January 8\u201313). Natural Radiation and Geochemistry of the Lamas de Olo Biotite Granite, Northern Portugal. Proceedings of the Goldschmidt, Sacramento, CA, USA."},{"key":"ref_44","first-page":"292","article-title":"The Magnetite-series and Ilmenite-series Granitic Rocks","volume":"27","author":"Ishihara","year":"1977","journal-title":"Min. Geol."}],"container-title":["Minerals"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2075-163X\/14\/4\/342\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T14:18:52Z","timestamp":1760105932000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2075-163X\/14\/4\/342"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,3,26]]},"references-count":44,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2024,4]]}},"alternative-id":["min14040342"],"URL":"https:\/\/doi.org\/10.3390\/min14040342","relation":{},"ISSN":["2075-163X"],"issn-type":[{"value":"2075-163X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,3,26]]}}}