Integrated study to refine high-precision dating for the geomorphic and geologic time scales of the Late Quaternary

广岛大学高精度放射性碳测年用低本底液体膨胀计数器开始例行测量。显微镜观察与数字图像记录有助于检查放射性碳样品，以评估由年轻的有机物质污染的可能性。从地质剖面的一系列日期提交贝叶斯分析使用树木校正程序。利用这种方法，建立了确定火山爆发和地震等事件层年龄的客观可靠的程序。通过对九州中部阿索和九州全新世火山灰剖面的全部取心钻探，建立了高精度火山灰年代学的标准方法。该岩心还提供了九州中部火山活动的最佳地层序列和标准的地质地层信息。为了重建晚全新世的环境变化，从北方九州的三个钻孔中提取了一至两千年的完整地质剖面。放射性碳测年、微观和宏观古生物学分析正在进行中。

Low-background liquid-scintilation counter for high-precision radiocarbon dating in Hiroshima University began routine measurement. Microsopic observation with digital image records helps to examine radiocarbon samples to evaluate the possibility of contamination by young organic matters. Serial dates from geologic sections were submitted to Bayesian analyses using dendrocorrection programs. With this method, objective and reliable procedures were established to determine the ages of event horizons such as volcanic eruptions and earthquakes. Through all core boring of Aso and Kuju Holocene tephra sections in central Kyushu, standard method for high-precision tephrochronology was established. The core also brought the best stratigraphic sequence of volcaninc activities in central Kyushu and standard chrno-stratigraphic information. For the reconstruction of environmental changes in Late Holocene, complete geologic sections of one to two thousand years were retrieved from three bore holes in northern Kyushu. Radiocarbon dating, micro- and macro-paleontological analyses are underway.