Origin of stable remanent magnetization in LL6 chondrite, St. Severin
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- Origin of stable remanent magnetization in LL6 chondrite, St. Severin
- Yu, Yongjae; Doh, Seong-Jae; Kim, Wonnyon; Min, Kyoungwon
- KIOST Author(s)
- Kim, Won Nyon(김원년)
- Thermal demagnetization has been carried out on 20 mutually oriented chips to unravel the stable paleomagnetic record of LL6 St. Severin. Whereas the higher unblocking fractions (520-560 degrees C) of natural remanent magnetization (NRM) are directionally scattered, the lower unblocking fractions (<520 degrees C) are relatively well constrained along a great circle in a stereographic projection. Microscopic analysis revealed St. Severin to contain paramagnetic troilite and a ferromagnetic Fe-Ni system. A sharp unblocking around 560 degrees C during thermal demagnetization strongly indicates that tetrataenite is the sole NRM carrier in St. Severin. The absence of kamacite contribution on NRM and the presence of a scattered higher unblocking fraction (520-560 degrees C) of NRM imply a sequence of brecciation and a shock-induced metamorphism rather than a thermal origin of NRM. (C) 2011 Elsevier B.V. All rights reserved.
- PHYSICS OF THE EARTH AND PLANETARY INTERIORS, v.187, no.3-4, pp.292 - 300, 2011
- ANALYTICAL ELECTRON-MICROSCOPY; STONY METEORITES; ORDERED FENI; PARENT BODY; CLASSIFICATION; TETRATAENITE; MAGNETISM; SHOCK; SUPERSTRUCTURE; SYSTEMATICS
- Chondrite; Meteorite; St. Severin; Tetrataenite; Taenite; Kamacite
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