Mineralogy of the Ibitira eucrite and comparison with other eucrites and lunar samples

Details Mineralogy of the Ibitira eucrite and comparison with other eucrites and lunar samples Mineralogy of the Ibitira eucrite and comparison with other eucrites and lunar samples

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..33...67s&link_type=abstract

Earth and Planetary Science Letters, vol. 33, Nov. 1976, p. 67-78.

Mathematics

Logic

24

Geochemistry, Lunar Rocks, Meteoritic Composition, Mineralogy, Chemical Composition, Crystal Structure, Crystallization, Lunar Surface, Olivine, Pyroxenes, Shock Loads, Single Crystals, Vapor Deposition, X Ray Analysis

Scientific paper

The mineralogy of the Ibitira meteorite is studied using single-crystal X-ray and energy-dispersive electron-probe techniques. It is shown that this strongly metamorphosed unbrecciated vesicular eucrite has a primary variolitic and secondary hornfelsic texture dominated by equant grains of pale-brown pyroxene (60%) set in an irregular matrix of plagioclase (30%). Minor phases are detected which indicate igneous crystallization, a prolonged metamorphic history, and vapor deposition. The following sequence of events is suggested as the simplest explanation for the mineralogical features observed: (1) crystallization of the meteorite in a lava flow; (2) prolonged annealing, reduction of primary spinel, and vapor deposition; (3) strong shock sufficient to modify the texture of the plagioclase grains; and (4) sufficient annealing to allow crystallization of the plagioclase as a subparallel mosaic and partial conversion to the low structural state. Evidence for this sequence is examined in detail, particularly in relation to the general features of eucrites, howardites, and mesosiderites

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