Nov 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966ssrv....6..174o&link_type=abstract
Space Science Reviews, Volume 6, Issue 2, pp.174-221
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5
Scientific paper
The tektites called Muong Nong type by V. Barnes apparently represent the parent material from which other types are derived. In these tektites are found clues (coesite, angular voids) which indicate that they have not been substantially remelted since the event which detached them from the planet or satellite on which they were formed. From the nickel-iron spherules and the coesite it is deduced that the tektites were detached by meteorite impact. From the absence of cosmogenic isotopes and the distribution over the earth it is deduced that the source was either the earth or the moon. Calculations of rates of diffusion in silicates indicate that tektites could not have been produced from terrestrial sedimentary rocks; it has long been remarked that they are different from terrestrial igneous rocks. A lunar origin is therefore considered likely, in agreement with aerodynamic evidence. Contrary indications from the geochemical likeness of tektites to terrestrial materials, especially at the Ries Kessel and the Bosumtwi crater are noted, but these indications are considered to be outweighed by the difficulties of giving a physical account of a terrestrial origin. Interpreted as lunar materials, the tektites suggest that large portions of the lunar surface are covered with ash-flow tuff of a peculiar type, remarkably free of water and other volatiles. They also give evidence concerning the origin of the moon.
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