Exploring Smoothing and Interpolation in Thellier-Type Paleointensity Determinations
Casas Duocastella, Lluís (Universitat Autònoma de Barcelona. Departament de Geologia)
Ortiz, Marc (Geo-Min)
Di Febo, Roberta (Universitat Autònoma de Barcelona. Departament de Geologia)

Data:	2025
Resum:	Smoothing and interpolation of zero-field (Z) and infield (I) heating steps in Thellier-type paleointensity determinations have been tested. Paleomagnetic samples of different materials were artificially magnetized with an applied field of 50 µT. Six samples were measured following the standard double-heating Coe-variation experimental protocol, and the obtained results were used to test several mathematical functions to smooth the experimental data. The best smoothed results were obtained using a Five Parameters Logistic (5PL) function that resulted in field estimates of good quality, although not better than those obtained experimentally. Therefore, the smoothing of de- and remagnetization data appears unnecessary. In addition to smoothing, the tested functions can be used to interpolate additional Z and, indirectly, also I steps. Interpolation using cubic Hermite splines (without any smoothing) displays a better performance than interpolation (and smoothing) using the 5PL function. A new single-step heating method is presented, combining experimental and interpolated de- and remagnetization steps. The new method would not be applicable for retrieving reliable ancient field intensities on its own, but it could save measuring time under some circumstances.
Ajuts:	Ministerio de Economía y Competitividad CGL2013-42167-P
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Paleomagnetic intensity ; Thellier ; Smoothing ; Interpolation ; Single-step
Publicat a:	Minerals, Vol. 15, Issue 8 (August 2025) , art. 873, ISSN 2075-163X

DOI: 10.3390/min15080873

19 p, 10.3 MB

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