Anisotropy of Out-of-Phase Magnetic Susceptibility: A Non-Standard Approach for Magnetic Subfabrics Determination in Variscan Granites of Iberian Massif

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022

Autores

Cruz, C (Autor) Outra; Sant'Ovaia, H (Autor) FCUP; McCarthy, W (Autor) Outra; Noronha, F (Autor) FCUP

Revista

Título: Minerals

Vol. 153

Página Final: 1376

Editora: MDPI

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 1 Citação

Outras Informações

ID Authenticus: P-00X-CRY

DOI: 10.3390/min12111376

Abstract (EN): The magnetic susceptibility measured in an alternating field is made up of in-phase and out-of-phase components. The in-phase Anisotropy of Magnetic Susceptibility (ipAMS) measures the bulk response of all minerals in a sample; however, out-of-phase AMS (opAMS) is sensitive to only select ferromagnetic minerals such as hematite, titanomagnetite, and ultrafine magnetite. The opAMS can be harnessed as a tool for the direct determination of magnetic subfabrics defined by ferromagnetic minerals. This work focuses on the following three Portuguese plutons: Lamas de Olo, Lavadores-Madalena, and Santa Eulalia. The results show that the magnetic susceptibility is lower in opAMS, the degree of magnetic anisotropy is much higher in the opAMS, and the ellipsoid shape parameter has no significant differences. The ipAMS and opAMS tensors are, in general, coaxial, which indicates that the standard AMS fabric is parallel to the subfabric of minerals such as hematite, titanomagnetite, and ultrafine magnetite.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12