Other
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59..613c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 3, pp.613-624
Other
16
Scientific paper
Abundances of Li, Be, and B, as well as boron isotopic compositions, were determined in twenty-seven tektite and impact glass samples, using an ion microprobe. Samples included tektites from the Australasian, North American, and Ivory Coast strewn fields, and Aouelloul and Darwin impact glasses. Variations of B abundance and isotopic composition in a flanged australite were also studied. 11 B variations of only a few permil were found within the australite flange. The isotopic composition shows no correlation with the B contents or with the distance from the rim of the flange. The mean 11 B value for the flanged australite is very similar to that of Muong-Nong type tektites (-1.9 ± 1.9 ). Thus, vapor fractionation has been unimportant during tektite formation. This is supported by the observation that B contents and the 11 B values of the different samples from the Australasian tektite strewn field are not correlated with each other. Most tektites show a rather limited range of 11 B values (-9.3 ± 1.5 to +2.7 ± 1.5%o), which is small compared to the range observed for common terrestrial rocks (-30 to +40 ). The B abundance and isotopic data can be used to place constraints on the tektite source rocks. Australasian tektites have high B and Li abundances; only clay-rich sediments, such as pelagic and neritic sediments, as well as river and deltaic sediments have B contents (up to 100 ppm) and 11 B values that are in agreement with the range shown by Australasian tektites (-4.9 to + 1.4 ). 10 Be and Rb---Sr data indicate continental crustal source rocks and exclude pelagic and neritic sediments. However, deltaic sediments, e.g., from the Mekong river, which are of continental crustal origin, agree with 10 Be, Rb---Sr, and B data, and support a possible source locality close to the coast of SE Indochina in the South China Sea. On the other hand, one bediasite sample has a very high 11 B value of +15.1 ± 2.1 , requiring the presence of marine carbonates or evaporites among the source rocks. This finding supports an offshore locality for the North American tektite source crater.
Chaussidon Marc
Koeberl Christian
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