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The first 3D resistivity model for Portugal mainland is here reported using data from 31 broadband MT soundings spaced 50\u00a0\u00d7\u00a050\u00a0km apart. The model shows large crustal volumes with contrasting resistivity values. The central and northern regions are characterized by a high resistivity crustal domain spreading in\u2010depth (10<jats:sup>3<\/jats:sup>\u201310<jats:sup>5<\/jats:sup> \u03a9.m) that correlates well with voluminous granitoid bodies and high\u2010grade metamorphic rocks. To the west and the south, roughly corresponding to the Portuguese Western Shore and the South Portuguese Zone (SPZ) respectively, the crustal resistivity tends to decrease unevenly to values between 1 and 10<jats:sup>3<\/jats:sup> \u03a9.m. Interconnected graphite in structural discontinuities, possibly forming a regional mid\u2010crustal <jats:italic>d\u00e9collemen<\/jats:italic>t at \u224813\u201315\u00a0km depth, are highlighted by multiple low resistivity crustal domains (1\u2013100 \u03a9.m). Similarly, the model reveals a very large E\u2010W low resistivity crustal domain in SPZ possibly representing a deep\u2010seated major <jats:italic>d\u00e9collement<\/jats:italic>. The present study aims to contribute to a better understanding of the physical properties characterizing the concealed crust in Portugal mainland, providing also indirect information on its composition and structure.<\/jats:p>","DOI":"10.1029\/2022ea002732","type":"journal-article","created":{"date-parts":[[2023,7,26]],"date-time":"2023-07-26T17:41:26Z","timestamp":1690393286000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Crustal Imaging of Portugal Mainland Using Magnetotelluric Data"],"prefix":"10.1029","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1368-3096","authenticated-orcid":false,"given":"P.","family":"Baltazar\u2010Soares","sequence":"first","affiliation":[{"name":"Universidade de Lisboa Faculdade de Ci\u00eancias Instituto Dom Luiz  Lisboa Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9005-7905","authenticated-orcid":false,"given":"F. 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