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

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

doi:10.1016/j.pepi.2011.06.004

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

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

Department of Earth and Environmental Sciences

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	292-300
Number of pages	9
Journal	Physics of the Earth and Planetary Interiors
Volume	187
Issue number	3-4
DOIs	https://doi.org/10.1016/j.pepi.2011.06.004
Publication status	Published - 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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10.1016/j.pepi.2011.06.004

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title = "Origin of stable remanent magnetization in LL6 chondrite, St. S{\'e}verin",

abstract = "Thermal demagnetization has been carried out on 20 mutually oriented chips to unravel the stable paleomagnetic record of LL6 St. S{\'e}verin. 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. S{\'e}verin 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. S{\'e}verin. 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.",

keywords = "Chondrite, Kamacite, Meteorite, St. S{\'e}verin, Taenite, Tetrataenite",

author = "Yongjae Yu and Doh, {Seong Jae} and Wonnyon Kim and Kyoungwon Min",

note = "Funding Information: This work was supported by the Mid-career Researcher Program through an NRF grant funded by the MEST (No. R01-2007-000-10517-0 ). The manuscript was greatly improved by constructive reviews of two an anonymous referees and editors K. Zhang and Y. Pan. ",

year = "2011",

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doi = "10.1016/j.pepi.2011.06.004",

language = "English",

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pages = "292--300",

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T1 - Origin of stable remanent magnetization in LL6 chondrite, St. Séverin

AU - Yu, Yongjae

AU - Doh, Seong Jae

AU - Kim, Wonnyon

AU - Min, Kyoungwon

N1 - Funding Information: This work was supported by the Mid-career Researcher Program through an NRF grant funded by the MEST (No. R01-2007-000-10517-0 ). The manuscript was greatly improved by constructive reviews of two an anonymous referees and editors K. Zhang and Y. Pan.

PY - 2011/8

Y1 - 2011/8

N2 - 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.

AB - 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.

KW - Chondrite

KW - Kamacite

KW - Meteorite

KW - St. Séverin

KW - Taenite

KW - Tetrataenite

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M3 - Article

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SN - 0031-9201

VL - 187

SP - 292

EP - 300

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

IS - 3-4

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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