Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...40..455t&link_type=abstract
Icarus, vol. 40, Dec. 1979, p. 455-470.
Astronomy and Astrophysics
Astronomy
28
Achondrites, Asteroids, Astronomical Models, Crusts, Meteoritic Composition, Breccia, Chemical Composition, Crystallization, Petrology, Pyroxenes, Quantitative Analysis, Reconstruction, Single Crystals, X Ray Diffraction
Scientific paper
A layered-crust model of a Howardite parent body which is a Vesta-like hypothetical asteroid composed of diogenites, eucrites, and howardites is presented. Single-crystal X-ray diffraction and microprobe studies of their pyroxenes indicate that their exsolution and inversion textures vary systematically with respect to their crystallization trend deduced from their Mg and Ca concentrations. Consideration of Mg-rich textures and Yamato pyroxenes found in Antarctica confirmed that they were originally cores of the rapidly cooled Pasamonte-like pigeonites. Based on these data, a layered-crust model was reconstructed from bottom to top as: (1) Mg-rich diogenite layer with orthopyroxenes with or without exsolution lamellae of augite with common (100) plane; (2) Fe-rich diogenite layer with inverted low-Ca pigeonites and orthopyroxenes; (3) cumulate eucrite layer with low-Ca pigeonites with blebby augite inclusions; (4) Moore County-like layer with partially inverted pigeonites with (001) augite lamellae and plagioclase
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