{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T00:26:43Z","timestamp":1772843203317,"version":"3.50.1"},"reference-count":66,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2025,8,7]],"date-time":"2025-08-07T00:00:00Z","timestamp":1754524800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,8,12]]},"abstract":"<jats:title>SUMMARY<\/jats:title>\n               <jats:p>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 archipelago. We show that the dikes, dated at\u00a0\u22489.2 Ma, intruding the younger Miocene Casas Velhas formation, display a Ti-rich titanomagnetite composition, higher whole-rock TiO2 content and very high magnetic anisotropy. They are clearly distinguished from the dikes, ranging in age from\u00a0\u22489.3 to 11.3 Ma, intruding older formations, which show a predominantly Ti-poor titanomagnetite composition with multiple magnetic phases, lower whole-rock TiO2 concentration, higher range of magnetic susceptibilities and very low anisotropy. Magnetic fabric is predominantly normal with no significant imbrication relative to the dike margins. Numerical analysis of fabric shows a dominant coaxiality between the magnetic lineation and the preferred orientation of opaques and phenocrystals suggesting that magnetic lineation is, therefore, the proxy of the magmatic flow axis orientation. Based on the orientation of the magnetic fabric, we infer that magmatic flow within the studied dikes is predominantly vertical. The differences observed between the younger dikes and all other dikes may be related to magma sourced from distinct magma chambers. One, probably shallow, underneath the Casas Velhas fm in the southwest of the island, which would explain the very high values of magnetic anisotropy and the inferred vertical flow, and another located in a central position in the island, responsible for the dikes intruding the older formations. The location of such magma reservoirs and the dikes ages suggest a hypothetical migration with age of the magmatic sources that fed the dikes from the central part of the island to the southwest region. The magnetic and mineralogical heterogeneities of the dikes intruding older Lower Cretaceous formations may also be a result of a wider age range of the intrusions.<\/jats:p>","DOI":"10.1093\/gji\/ggaf293","type":"journal-article","created":{"date-parts":[[2025,8,12]],"date-time":"2025-08-12T20:05:51Z","timestamp":1755029151000},"source":"Crossref","is-referenced-by-count":1,"title":["Age dependent variation of the magnetic fabric of dike swarms and implications for the volcanic structure of ocean islands: the example of the Maio Island, Cabo Verde archipelago"],"prefix":"10.1093","volume":"243","author":[{"given":"M\u00e1rio","family":"Moreira","sequence":"first","affiliation":[{"name":"Instituto Superior de Engenharia de Lisboa (ISEL), Instituto Polit\u00e9cnico de Lisboa Departamento de F\u00edsica, , rua Conselheiro Em\u00eddio Navarro 1, 1959-007 Lisboa ,","place":["Portugal"]},{"name":"Instituto Dom Luiz (IDL), Faculdade de Ci\u00eancias, Universidade de Lisboa , 1749-016 Lisboa ,","place":["Portugal"]}]},{"given":"Jo\u00e3o","family":"Mata","sequence":"additional","affiliation":[{"name":"Instituto Dom Luiz (IDL), Faculdade de Ci\u00eancias, Universidade de Lisboa , 1749-016 Lisboa ,","place":["Portugal"]},{"name":"Faculdade de Ci\u00eancias, Universidade de Lisboa Departamento de Geologia, , 1749-016 Lisboa ,","place":["Portugal"]}]},{"given":"Jos\u00e9","family":"Madeira","sequence":"additional","affiliation":[{"name":"Instituto Dom Luiz (IDL), Faculdade de Ci\u00eancias, Universidade de Lisboa , 1749-016 Lisboa ,","place":["Portugal"]},{"name":"Faculdade de Ci\u00eancias, Universidade de Lisboa Departamento de Geologia, , 1749-016 Lisboa ,","place":["Portugal"]}]},{"given":"Patr\u00edcia","family":"Represas","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio Nacional de Energia e Geologia (LNEG) , Estrada da Portela, Zambujal, Apartado 7586, 2611-901 Amadora ,","place":["Portugal"]}]},{"given":"Sofia","family":"Martins","sequence":"additional","affiliation":[{"name":"Faculdade de Ci\u00eancias, Universidade de Lisboa Departamento de Geologia, , 1749-016 Lisboa ,","place":["Portugal"]}]}],"member":"286","published-online":{"date-parts":[[2025,8,7]]},"reference":[{"issue":"7","key":"2025082304470459400_bib1","doi-asserted-by":"publisher","first-page":"941","DOI":"10.1016\/0191-8141(96)00011-9","article-title":"Shape fabrics of particles in low concentration suspensions: 2D analogue experiments and application to tiling in magma","volume":"18","author":"Arbaret","year":"1996","journal-title":"J. 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