Origin of stable remanent magnetization in LL6 chondrite, St. Séverin

Yongjae Yu, Seong Jae Doh, Wonnyon Kim, Kyoungwon Min

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Thermal demagnetization has been carried out on 20 mutually oriented chips to unravel the stable paleomagnetic record of LL6 St. Séverin. Whereas the higher unblocking fractions (520-560 °C) of natural remanent magnetization (NRM) are directionally scattered, the lower unblocking fractions (<520 °C) are relatively well constrained along a great circle in a stereographic projection. Microscopic analysis revealed St. Séverin to contain paramagnetic troilite and a ferromagnetic Fe-Ni system. A sharp unblocking around 560 °C during thermal demagnetization strongly indicates that tetrataenite is the sole NRM carrier in St. Séverin. The absence of kamacite contribution on NRM and the presence of a scattered higher unblocking fraction (520-560 °C) of NRM imply a sequence of brecciation and a shock-induced metamorphism rather than a thermal origin of NRM.

Original languageEnglish
Pages (from-to)292-300
Number of pages9
JournalPhysics of the Earth and Planetary Interiors
Volume187
Issue number3-4
DOIs
Publication statusPublished - 2011 Aug

Keywords

  • Chondrite
  • Kamacite
  • Meteorite
  • St. Séverin
  • Taenite
  • Tetrataenite

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

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