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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Low field frequency dependent magnetic susceptibility inversion

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Ustra, Andrea [1] ; Mendonca, Carlos [1] ; Leite, Arua [2] ; Jaqueto, Plinio [1] ; Novello, Valdir Felipe [3]
Total Authors: 5
[1] Univ Sao Paulo, Inst Astron Geophys & Atmospher Sci, Dept Geophys, Rua Matao 1226, BR-05508090 Sao Paulo - Brazil
[2] Univ Paul Sabatier, Observ Midi Pyrenees, Geosci Environm Toulouse, 14 Ave Edouard Belin, F-31400 Toulouse - France
[3] Univ Sao Paulo, Geosci Inst, Dept Sedimentary & Environm Geol, Rua Lago 562, BR-05508080 Sao Paulo, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Computers & Geosciences; v. 133, DEC 2019.
Web of Science Citations: 0

In this work we present an open source implementation of the procedure proposed by Ustra et al. (2018) to invert frequency dependent susceptibility (FDS) data to obtain quantitative information on grain-size variations of magnetic particles in the transition of superparamagnetic (SP) to stable single domain (SSD). The software provides the inversion parameters (FDS asymptotes) as well as the limiting frequency effect and transition factor, which provide information regarding contribution of the SP particles to magnetic susceptibility as well as relative variation of the particle grain-size in the SP-SSD transition. Numerical simulations show the procedure's capability in retrieving modeled parameters and fitting data, and its limitation regarding the range of variation of relaxation times. Real data application illustrates the reliability of the procedure for a mineral assemblage in the SP-SSD range. (AU)

FAPESP's process: 16/24870-2 - Environmental significance of speleothem magnetism
Grantee:Plinio Francisco Jaqueto
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 16/00299-4 - Geochemistry of vadose percolation in karst systems: implications for paleoclimatic interpretations os speleothem records
Grantee:Ivo Karmann
Support type: Regular Research Grants
FAPESP's process: 16/06114-6 - The Neoproterozoic Earth System and the rise of biological complexity
Grantee:Ricardo Ivan Ferreira da Trindade
Support type: Research Projects - Thematic Grants