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isotopic |
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| Instead, Stardust investigator Don Brownlee of the University of Washington in Seattle and his colleagues found that the isotopic composition of nearly every grain that they analyzed matched that of the inner solar system, demonstrating that the rocky material in Wild 2 indeed originated in the solar system. Because the concentration measurements indicated that this contamination was not naturally derived, we analyzed other materials for lead concentrations and lead isotopic composition to determine possible sources of the increase in lead in cocoa products. This is the challenge addressed by the contributors to an edited volume in the Geological Society Special Publication series entitled Geochronology: Linking the isotopic record with petrology and textures. |
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