Other
Scientific paper
Sep 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969gecoa..33.1113k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 33, Issue 9, pp.1113-1116
Other
1
Scientific paper
Black magnetic spherules, 30-150 in dia., extracted from crushed indochinites and other tektites, as well as magnetic fractions of various impact glasses were polished and studied under the reflecting microscope and by the electron microprobe. In the tektites, three kinds of spherules were found: type I, magnetic spherules consisting of magnetite skeletons embedded in a glass matrix with a small nucleus of pure iron; type II, intergrowths of magnetite and wüstite and some interstitial glass; and type III, a single glass spherule which contains finely distributed magnetite skeletons and idiomorphic magnetite crystals partially intergrown with wüstite. In impact glasses, magnetite does not occur in spherules but as type I (called primary magnetite), representing the more or less effected titanomagnetite of the original rock; and type II, intergrowths of glass and skeletal magnetite, in which iron and oxygen are the only constituents (interpreted as secondary and analogous to the magnetite spherules in tektites). The absence of nickel in the metallic phase and the lack of diffusion boundaries around the spherules in tektites is evidence that the spherules are not of meteoritic origin but formed within the tektite glass. The presence of skeletal magnetite in glass spherules indicates rapid cooling of a high temperature melt.
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