Isotopic composition of lead from tektites |
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| Affiliation: | 1. Department of Geosciences, Swedish Museum of Natural History, SE 104 05 Stockholm, Sweden;2. Department of Geological Sciences, Stockholm University, SE 106 91 Stockholm, Sweden;3. Department of Applied Geology, Curtin University, Perth, WA 6845, Australia;1. Department of Geological Sciences, Central Washington University, Ellensburg, WA, USA;2. Department of Geological Sciences, University of Colorado Boulder, CO, USA;1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;2. EGRU (Economic Geology Research Center), James Cook University, Townsville 4811, Australia;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The isotopic composition of lead in three tektites and Libyan Desert glass is compared with that in known terrestrial and extra-terrestrial sources. The lead contained in the glasses is similar to modern terrestrial lead, particularly lead from modern oceanic sediments. The uranium, thorium and lead concentrations were determined for one of the glasses, an australite. Evidence is given which indicates that within the last tens of millions of years differentiation of uranium, thorium and lead occurred in the parent material of the australite. These results are difficult to explain in terms of any extra-terrestrial origin involving fusion of materials from the moon, meteorites or comets, but they are readily explained if tektites are of terrestrial origin involving fusion of argillaceous sediments in some unspecified way. |
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