An exploitation of new obsidian hydration dating toward the establishment of reliable chronology in prehistoric sites and the estimation of paleoclimatic conditions

本研究旨在探索黑曜石水化测年新的研究方向。为了建立可靠的史前遗址年表和古气候条件的估计，我研究了OHD是否以及在多大程度上起作用。通过系统地比较试件内和试件间的边缘厚度变化，提出了一种选择可靠测量值的方法。通过使用从样本中系统选择的平均边缘厚度来估计站点日期。采用Rogers（2007）提出的估算有效水化温度（EHT）的数学公式。研究的早全新世站点的EHT和当地气象资料的平均温度之间的差异表明，全新世气候最大值和响应于沉积物积累的样品深度的变化对EHT有影响。

The goal of present research is to explore the new research direction of obsidian hydration dating (OHD). Toward the establishment of reliable chronology of prehistoric sites and estimation of paleoclimatic conditions, I examined as to whether and to what extent OHD works. A procedure to choose reliable measurement was proposed through a systematic comparison of variation in rim thicknesses within and between the specimens. Site dates were estimated by using the mean rim thickness that was systematically chosen from the samples. The mathematical formula to estimate the effective hydration temperature (EHT) proposed by Rogers (2007) was employed. The difference between EHT for studied early Holocene site and mean temperature based on the local meteorological data indicated that both Holocene climatic maximum and changes in depths of samples in response to the accumulation of sediments had effects on EHT.