Some studies of an unusual eucrite - Ibitira

Details Some studies of an unusual eucrite - Ibitira Some studies of an unusual eucrite - Ibitira

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1205w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Sept. 1975, p. 1205-1210.

Computer Science

13

Feldspars, Meteoritic Composition, Particle Tracks, Pyroxenes, Basalt, Chemical Composition, Cosmic Rays, Microanalysis, Radiation Effects

Scientific paper

The Ibitira eucrite is remarkable both for its vesicles and its unbrecciated nature. It consists of nearly 63 vol.% pyroxene (Wo14En38Fs48), 31% plagioclase (An95-96), nearly 2% of nickel-iron, troilite, ilmenite, titanian chromite, and 4% of a silica polymorph. It has a mean track density of 1.8 plus or minus 0.3 x 1,000,000 per sq cm, mainly due to cosmic rays. Its pre-atmospheric radius must have been at least 10 cm. The absence of complex radiation effects and presence of vesicles place constraints on the thickness of the Ibitira basalt flow. From the freezing time calculations of Provost and Bottinga, it appears that Ibitira came from a flow no less than 2.5 m and probably no more than 10 or 20 m thick. However, this estimate depends strongly on the viscosity of the melt, which is not well known.

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