Petrophysical Characterization of Non-Magnetic Granites; Density and Magnetic Susceptibility Relationships

Pueyo, Emilio L. ; Román-Berdiel, Teresa (Universidad de Zaragoza) ; Calvín, Pablo ; Bouchez, Jean Luc ; Beamud, Elisabet ; Ayala, Conxi ; Loi, Francesca ; Soto, Ruth ; Clariana, Pilar ; Margalef, Aina ; Bach, Nuria ; Schamuells, Nia ; Rubio, Félix M. ; Gimeno, Ana ; Fernández de Arévalo, Elena ; Rey-Moral, Carmen ; García, Arturo ; Martí, Joan ; Casas, Antonio M. (Universidad de Zaragoza) ; García-Lobón, José Luis

Resumen: In this work we establish reliable correlations between density and magnetic susceptibility in three paramagnetic granites from the Pyrenees. In total, 128 sites (310 density measurements and >2600 susceptibility ones) were studied in the Mont Louis-Andorra, Maladeta and Marimanha granitic plutons covering the main range of variability of magnetic susceptibility. Regressions were calculated for every granitic body and an integrated linear function was obtained for the entire dataset: \u03c1 (kgm3) = 2566 (kgm3) + 0.541\u03ba (10\u22126 S.I.) (R:0.97). This relationship is only valid in the paramagnetic domain, where iron is mostly fractioned in iron-bearing phyllosilicates and the occurrence of magnetite is negligible (or at least its contribution to the bulk susceptibility). This relationship, likely different in other bodies, allows for transforming magnetic susceptibility data into density data, helping to constrain gravity modelling when density data from rock samples are scarce. Given the large amount of AMS studies worldwide, together with the quickness and cost-effectiveness of susceptibility measurements with portable devices, this methodology allows for densifying and homogenizing the petrophysical data when modelling granite rock volumes based on both magnetic and gravimetric signals.

Idioma: Inglés

DOI: 10.3390/geosciences12060240

Año: 2022

Publicado en: Geosciences (Switzerland) 12, 6 (2022), 240 [26 pp.]
ISSN: 2076-3263

Factor impacto CITESCORE: 5.2 - Earth and Planetary Sciences (Q1)

Factor impacto SCIMAGO: 0.66 - Earth and Planetary Sciences (miscellaneous) (Q2)

Financiación: info:eu-repo/grantAgreement/EC/H2020/731166/EU/Establishing the European Geological Surveys Research Area to deliver a Geological Service for Europe/GeoERA
Financiación: info:eu-repo/grantAgreement/ES/MCIU/CGL2017-84901-C2-2-P
Financiación: info:eu-repo/grantAgreement/ES/MICINN/FJC-2019-041058-I
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2020-104693GB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2020-114273GB-C22
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PTA2017-14779-I

Tipo y forma: Article (Published version)

Área (Departamento): Área Geodinámica Interna (Dpto. Ciencias de la Tierra)