U-series Dating of a Speleothem from Inazumi Cave, Oita Prefecture, Japan
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概要
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Trace quantities of uranium and thorium were separated from a submerged calcite speleothem (stalactite) sample from Inazumi Cave, Oita Prefecture, using Fe (OH) <SUB>3</SUB> coprecipitation followed by anion-exchange separation with HNO<SUB>3</SUB> and HCl. The isotope ratios <SUP>234</SUP>U/<SUP>238</SUP>U and <SUP>230</SUP>Th/<SUP>234</SUP>U were determined by isotope-dilution thermal ionisation mass spectrometry. The speleothem became submerged by accumulation of the Aso welded-tuff, Aso-4, and a resulting rise in the local water table that occurred 85, 000-89, 000 years ago. The age of the analysed portion of the sample was 170, 000 years B.P., suggesting that it was deposited before the earlier Aso-2 and-3 eruptions and has been submerged at least three times.
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