Structural deformation of the Leoville chondrite

Details Structural deformation of the Leoville chondrite Structural deformation of the Leoville chondrite

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..77..165c&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 77, no. 2, March 1986, p. 165-175. Research supported by the Universi

Computer Science

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Carbonaceous Chondrites, Chondrule, Microstructure, Plastic Deformation, Breccia, Fracture Mechanics, Olivine, Strain Measurement, Meteorites, Leoville, Structure, Deformation, Cv3 Chondrites, Clasts, Stony Meteorites, Chondrules, Foliation, Chondrules, Shape, Inclusions, Strain, Shock Effects, Thermal Effects, Impacts, Metamorphism, Flow, Compaction, Accretion, Formation, Parent Bodies, Temperature, Diffusion

Scientific paper

A petrofabric study of the Leoville chondrite was performed in order to gain an understanding of its deformation process. Strain values were determined from the chondrules' axial ratios or by the all-object-separation method, and the compaction required to deform Leoville chondrules was calculated from the decrease of radius in the circle-to-ellipse transformation. Structural and strain studies indicate the following order of events experienced by Leoville: (1) formation as an accretionary breccia, (2) compaction and development of foliation, (3) fracturing, possibly due to impact on earth, and (4) terrestrial weathering. Similarities between the axial ratios of chondrules (1.9-2.0) and of the whole meteorite (2.0) indicate either that Leoville deformed homogeneously or that it deformed as a framework of touching chondrules. This amount of strain corresponds to approximately 33 percent uniaxial shortening, assuming constant volume, and is likely to have been caused by compaction due to overburden from progressive accretion on the chondrite body. Diffusional flow is believed to be the mechanism by which olivines in these chondrules deformed.

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