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Origin of Petrofabrics and Magnetic Anisotropy in Ordinary Chondrites
Author(s) -
Sneyd Deana S.,
McSween Harry Y.,
Sugiura Naoji,
Strangway David W.,
Nord Gordon L.
Publication year - 1988
Publication title -
meteoritics
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0026-1114
DOI - 10.1111/j.1945-5100.1988.tb00909.x
Subject(s) - lineation , chondrite , anisotropy , deformation (meteorology) , foliation (geology) , geology , ellipsoid , magnetic anisotropy , shock (circulatory) , metamorphic rock , finite strain theory , mineralogy , meteorite , magnetization , magnetic field , geochemistry , optics , physics , seismology , astrobiology , tectonics , medicine , oceanography , geodesy , quantum mechanics , finite element method , thermodynamics
— Three‐dimensional finite strain and magnetic susceptibility anisotropy have been determined for 15 ordinary chondrites. The axes of strain and magnetic ellipsoids roughly correlate in both magnitude and orientation. The shapes of these ellipsoids are generally oblate spheroids that define a dominant foliation and a weak lineation. These characteristics suggest deformation involving uniaxial compaction. The degree of uniaxial deformation correlates with intensity of shock, as indicated by optical, TEM and chemical criteria. These data, plus the lack of a relationship between foliation and metamorphic history, indicate that dynamic processes, i.e. , impacts, produced planar deformation fabrics in chondrites.