Experimental testing of hypotheses for the origin of tektites

Details Experimental testing of hypotheses for the origin of tektites Experimental testing of hypotheses for the origin of tektites

Jun 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..999c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 6, pp.999-1000

Computer Science

1

Scientific paper

A letter to Nature by and (1955) reported the finding of highly siliceous spheres of glass embedded in glass of more basic composition in high-temperature quench runs made on tektite material. On this basis it was suggested that the "lechatelierite" inclusions in tektites represent a siliceous glass immiscible with the main body of more basic tektite glass. Work reported here contradicts the earlier results. Two quench samples are illustrated in which appear features looking remarkably like liquid-liquid equilibria. The earlier misrepresentation is attributed to one of these. A paper by Cassidy (1958) suggested a common origin for tektites and stony meteorites through segregation by liquid immiscibility. Experimental work reported in the present paper do not support this hypothesis, and it is discarded. The liquidus temperature of a natural australite was found to be 1347 ± 15° C and its primary crystalline phase was found to be SiO 2 (cristobalite). From this it is concluded that tektites are not igneous products derived from more basic rocks by the well-known process of crystal fractionation. They could have been formed by melting of sediments of the requisite composition or in a magma that had become highly siliceous by incorporation of appropriate xenolithic material.

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