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The effect of crushing on the TL and OSL signals in quartz was investigated to examine the feasibility of using OSL and TL for dating of faulted rocks. 275°C TL signals were not reduced by crushing by hand (mortar and pestle), in a pellet die press, or using an automatic mortar and pestle, but the sensitivity of the 100°C TL signal to a test dose decreased in crushed samples. Green light-stimulated OSL signal intensities were not decreased after crushing, but showed strongly increased inter-aliquot variability after crushing. We concluded that OSL and TL in quartz might be useful to characterize the crushing history of quartz in fault rocks, but their usefulness in dating fault events was not evident because we did not find evidence of signal zeroing under the conditions used in this study.

We present the results of a pilot study in which ESR. TL and optical dating are intercompared to assess their suitabilities for application to measurement of the uplift rates of the Japanese Islands. Samples used were known-age marine ten-ace sediments collected from three sites in Central Japan. As a result of optical bleaching experiments, it was found that the TL residual intensity was identified by UV lamp, but we were not able to determine how the bleaching of the ESR Ti signal proceeded in antiquity. ESR, TL and optical dating were performed using the Ti signal. the red TL emission and the UV emissions measured during stimulation by the waveband 500±40 nm respectively. Equivalent doses were estimated using the additive-close method. Dose rates were calculated from radioisotope concentrations measured using neutron activation analysis. It was found that variation in pore water content over time was of major significance in age determinations for these sediments, on account of their history of deposition underwater, with subsequent uplift and drainage. It was concluded from the correspondence of ages estimated by TL and optical dating with geological expectation that the TL and optical dating methods are suitable for dating marine terrace sediments.

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Tl osl and esr dating techniques

Tl osl and esr dating techniques