Micromagnetic and microstructural analyses in chondrules of the Allende meteorite
Results of micromagnetic and microstructural studies of individual chondrules from the Allende carbonaceous meteorite are presented. Allende is a member of the CV3 carbonaceous chondrites, and part of the oxidized meteorites with iron in silicates and oxides. Magnetic hysteresis data in terms of plo...
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Universidad Nacional Autónoma de México
2018-02-01
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| Series: | Revista Mexicana de Ciencias Geológicas |
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| Online Access: | https://rmcg.unam.mx/index.php/rmcg/article/view/731 |
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| author | Daniel Flores-Gutiérrez Jaime Urrutia-Fucugauchi Ligia Pérez-Cruz Carlos Linares-López |
| author_facet | Daniel Flores-Gutiérrez Jaime Urrutia-Fucugauchi Ligia Pérez-Cruz Carlos Linares-López |
| author_sort | Daniel Flores-Gutiérrez |
| collection | DOAJ |
| description | Results of micromagnetic and microstructural studies of individual chondrules from the Allende carbonaceous meteorite are presented. Allende is a member of the CV3 carbonaceous chondrites, and part of the oxidized meteorites with iron in silicates and oxides. Magnetic hysteresis data in terms of plots of parameter ratios give relationships with chondrule size and shape, in particular with magnetization ratio (Mr/Ms) and coercivity (Hc). Morphology, internal structure and elemental composition are investigated by scanning electron microscopy and spectrometric analyses. Chondrules show low ranges of magnetization ratios (Mr/Ms from 0 to 0.22) and coercivity (Hc from 3 to 24 mT). Low values suggest that chondrules are susceptible to alteration and re-magnetization, which affects paleointensity determinations for the early planetary magnetic fields A linear relation of Mr/Ms as a function of Hc is found up to values of 0.17 and 17 mT, respectively. This relation correlates with internal microstructure and composition, with compound chondrules showing higher hysteresis ratio and parameter values. Chondrules with hysteresis parameters falling outside the major trend show internal structures, composition and textures indicative of compound chondrules, and fragmentation and alteration processes. Microprobe analyses show distinct mineralogical assemblages with spatial compositional variation related to chondrule size, shape and microstructure.
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| format | Article |
| id | doaj-art-1c629f27ee554eb1af35af8d4eae8cb0 |
| institution | Kabale University |
| issn | 1026-8774 2007-2902 |
| language | English |
| publishDate | 2018-02-01 |
| publisher | Universidad Nacional Autónoma de México |
| record_format | Article |
| series | Revista Mexicana de Ciencias Geológicas |
| spelling | doaj-art-1c629f27ee554eb1af35af8d4eae8cb02025-08-20T03:44:54ZengUniversidad Nacional Autónoma de MéxicoRevista Mexicana de Ciencias Geológicas1026-87742007-29022018-02-01271Micromagnetic and microstructural analyses in chondrules of the Allende meteoriteDaniel Flores-Gutiérrez0Jaime Urrutia-Fucugauchi1Ligia Pérez-Cruz2Carlos Linares-López3Instituto de Astronomía, Universidad Nacional Autónoma de México, Cd. Universitaria, Del. Coyoacán, 04510 México D.F., Mexico.Laboratorio de Paleomagnetismo y Geofísica Nuclear, Instituto de Geofísica, Universidad Nacional Autónoma de México, Cd. Universitaria, Del. Coyoacán, 04510 México D.F., Mexico.Laboratorio de Paleomagnetismo y Geofísica Nuclear, Instituto de Geofísica, Universidad Nacional Autónoma de México, Cd. Universitaria, Del. Coyoacán, 04510 México D.F., Mexico.Laboratorio Universitario de Petrología, Instituto de Geofísica. Universidad Nacional Autónoma de México, Cd. Universitaria, Del. Coyoacán, 04510 México D.F., Mexico.Results of micromagnetic and microstructural studies of individual chondrules from the Allende carbonaceous meteorite are presented. Allende is a member of the CV3 carbonaceous chondrites, and part of the oxidized meteorites with iron in silicates and oxides. Magnetic hysteresis data in terms of plots of parameter ratios give relationships with chondrule size and shape, in particular with magnetization ratio (Mr/Ms) and coercivity (Hc). Morphology, internal structure and elemental composition are investigated by scanning electron microscopy and spectrometric analyses. Chondrules show low ranges of magnetization ratios (Mr/Ms from 0 to 0.22) and coercivity (Hc from 3 to 24 mT). Low values suggest that chondrules are susceptible to alteration and re-magnetization, which affects paleointensity determinations for the early planetary magnetic fields A linear relation of Mr/Ms as a function of Hc is found up to values of 0.17 and 17 mT, respectively. This relation correlates with internal microstructure and composition, with compound chondrules showing higher hysteresis ratio and parameter values. Chondrules with hysteresis parameters falling outside the major trend show internal structures, composition and textures indicative of compound chondrules, and fragmentation and alteration processes. Microprobe analyses show distinct mineralogical assemblages with spatial compositional variation related to chondrule size, shape and microstructure. https://rmcg.unam.mx/index.php/rmcg/article/view/731chondrulesmagnetismstructurechemical compositionAllende meteorite |
| spellingShingle | Daniel Flores-Gutiérrez Jaime Urrutia-Fucugauchi Ligia Pérez-Cruz Carlos Linares-López Micromagnetic and microstructural analyses in chondrules of the Allende meteorite Revista Mexicana de Ciencias Geológicas chondrules magnetism structure chemical composition Allende meteorite |
| title | Micromagnetic and microstructural analyses in chondrules of the Allende meteorite |
| title_full | Micromagnetic and microstructural analyses in chondrules of the Allende meteorite |
| title_fullStr | Micromagnetic and microstructural analyses in chondrules of the Allende meteorite |
| title_full_unstemmed | Micromagnetic and microstructural analyses in chondrules of the Allende meteorite |
| title_short | Micromagnetic and microstructural analyses in chondrules of the Allende meteorite |
| title_sort | micromagnetic and microstructural analyses in chondrules of the allende meteorite |
| topic | chondrules magnetism structure chemical composition Allende meteorite |
| url | https://rmcg.unam.mx/index.php/rmcg/article/view/731 |
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