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The luminescence characteristics of volcanic plagioclase from an andesitic tephra (Hakone-Tokyo pumice, Hk-TP) from Japan were studied in order to assess if optical dating of plagioclase could be applied to Quaternary tephra. The tephra was shown to contain two kinds of plagioclase grains, labradorite which had a smooth surface and bytownite with a rough surface. The aliquots consisting of smaller...
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