A Practical Approach for Identification of Magnetic Fabric Carriers in Rocks

D. Elhanati, R. Issachar, T. Levi, R. Weinberger

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Magnetic fabric analyses of rocks by anisotropy of magnetic susceptibility (AMS) are a robust petrofabric tool that has been used in varied geological environments and tectonic settings. A fundamental difficulty of this method is to define the dominant magnetic phases and their resulting geological interpretation. We study the magnetic behavior of rocks by simulating data of mixed magnetic phases (i.e., diamagnetic, paramagnetic, and ferromagnetic). We show that it is possible to recognize the dominant magnetic phases by measuring the mean susceptibility at room temperature (kmRT) and at low temperature (kmLT). Distinct regions of magnetic phase dominancy are demonstrated in kmLT/kmRT versus kmRT and kmLT versus kmRT plots. We present a comprehensive approach by coupling the magnetic phase dominancy with possible magnetic fabrics, which are obtained from AMS measured at room and low temperatures (RT-AMS and LT-AMS) and anisotropy of anhysteretic remanent magnetization, into a scenario table. Application of this table allows a robust procedure for determining which magnetic phases are dominant, and permits a fast and reliable geological interpretation in complex settings.

Original languageEnglish
Article numbere2020JB021105
JournalJournal of Geophysical Research: Solid Earth
Volume126
Issue number5
DOIs
StatePublished - 1 May 2021
Externally publishedYes

Keywords

  • AARM
  • anisotropy of magnetic susceptibility
  • diamagnetism
  • magnetic fabrics
  • magnetic phases
  • paramagnetism

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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