Antarctic FRO090011 lodranite: Cooling history from pyroxene crystal chemistry and microstructure

Details Antarctic FRO090011 lodranite: Cooling history from pyroxene crystal chemistry and microstructure Antarctic FRO090011 lodranite: Cooling history from pyroxene crystal chemistry and microstructure

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.128..479m&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 128, no. 3-4, p. 479-487

Computer Science

8

Crystal Structure, Crystallography, Meteorites, Pyroxenes, Radiative Heat Transfer, Rocks, Electron Probes, Mass Spectrometers, Scattering Functions, Transmission Electron Microscopy, X Ray Diffraction

Scientific paper

The Antarctic FRO90011 lodranite shows an achondritic coarse granoblastic texture with an approximately chondritic composition. The crystal chemistry of Pbca and C2/c pyroxene single crystals and the transmission electron microscopy (TEM) texture of Pbca pyroxene were investigated reconstruct the evolutionary history of the meteorite parent body. The structural behaviour of orthopyroxene (En85Fs(12.4)Wo(2.6)) is well constrained in the En-Fs trend. Orthopyroxene Fe(2+)-Mg ordering in the M1 and M2 sites yields a closure temperature (Tc) of 570 +/- 20 C and a cooling rate 10 C/day near the Tc. Clinopyroxene is a low-iron augite (En51Fs5Wo44). Clinopyroxene Fe(2+)-Mg ordering in the M1 and M2 sites yields a Tc of 513 +/-50 C, which is compatible with the cooling rate derived from the orthopyroxene crystals. TEM investigation on orthopyroxene showed a few thin lamellae not larger than 20 A parallel to (100) and rare one unit cell Guinier-Preston zones. TEM-EDS analysis did not reveal significant chemical differences between lamella-rich and lamella-free zones. The above data are interpreted as being due to fast cooling resulting from radiative heat loss of small fragments ejected from a parent body, which were subsequently reassembled into a larger body.

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