A transmission electron microscope study of pyroxene chondrules in equilibrated L-group chondrites

Details A transmission electron microscope study of pyroxene chondrules in equilibrated L-group chondrites A transmission electron microscope study of pyroxene chondrules in equilibrated L-group chondrites

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..72...87w&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 72, no. 1, Jan. 1985, p. 87-98.

Computer Science

16

Chondrule, Electron Microscopy, Meteoritic Composition, Meteoritic Microstructures, Pyroxenes, Calcium, Cooling, Fine Structure, Iron, Meteorites, Electron Microscopy, Tem, Pyroxene, Chondrules, L Chondrites, Equlibrated Meteorites, Structure, Chemistry, Composition, Comparisons, Calcium, Iron, Cooling Rate, Texture, Thermal History, Deformation, Shock, Diffusion, Decomposition, Heating, Models

Scientific paper

Analytical electron microscopy is used to investigate the fine structures and chemical compositions of pyroxenes in ion-thinned specimens of rock chips from the L chondrites Allan Hills 77252, Fukutomi, and Satsuma. The results are presented graphically and characterized in detail. The differences noted between the pyroxenes of L3 and those of L3-4 and L4-5 chondrules are interpreted as evidence for more rapid cooling in L3, while shock deformations obscure the original thermal history of L6. The similar periodicities of the spinodal decomposition textures in the Ca-rich pyroxenes of the L3, L3-4, and L4-5 chondrules are attributed to the lack of a significant reheating event in the equilibrated chondrites.

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