Origin of stable remanent magnetization in LL6 chondrite, St. Severin
- Authors
- Yu, Yongjae; Doh, Seong-Jae; Kim, Wonnyon; Min, Kyoungwon
- Issue Date
- 8월-2011
- Publisher
- ELSEVIER
- Keywords
- Chondrite; Meteorite; St. Severin; Tetrataenite; Taenite; Kamacite
- Citation
- PHYSICS OF THE EARTH AND PLANETARY INTERIORS, v.187, no.3-4, pp.292 - 300
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICS OF THE EARTH AND PLANETARY INTERIORS
- Volume
- 187
- Number
- 3-4
- Start Page
- 292
- End Page
- 300
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/111908
- DOI
- 10.1016/j.pepi.2011.06.004
- ISSN
- 0031-9201
- Abstract
- 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.
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