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A study on accurate age measurement of buried wood by high-precision 14C dating and 14C wiggle matching

高精度14C测年和14C摆动匹配准确测量埋藏木材年龄的研究

基本信息

批准号：
10680174
负责人：
NAKAMURA Toshio
金额：
$ 2.11万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The purpose of this research is to conduct high precision ィイD114ィエD1C dating on buried wood samples, by using a high performance AMS ィイD114ィエD1C dating system at Nagoya University. Troubles of the machine took place frequently during the past two years and this hindered the smooth conduct of the experiment. However, the following studies were performed successfully. (1) AMS ィイD114ィエD1C dating of continuous annual ring samples of covering totally 30 years from a wood trunk, that was buried by the pyroclasic flow deposits produced by an eruption from the Hakuto-san volcano, located on the border of China and North Korea, (2) AMS ィイD114ィエD1C dating of organic carbon extracted from lake sediments, and (3) many woody samples.First of all, a reproducibility test of ィイD114ィエD1C/ィイD112ィエD1C measurement was performed successfully for NBS oxalic acid ィイD114ィエD1C standard, and reproducibilities ranged from ± 14 to ± 33 years. Next, accuracy of the ィイD114ィエD1C dating system was tested successfully … More for eight IAEA samples of known ages.The Hakuto-san volcano erupted in the early of the tenth century and this is considered to have caused a tragic damage to the destruction of Bokkai Dinasty which was once ruling a large area of north-east part of a China. The eruption age was estimated by Fukusawa (1999), who analyzed varves appeared in the lake sediment of Ogawara Lake, Aomori prefecture, to be 937 or 938 AD. All 37 annual rings were separated by hand and outer 30 rings were ィイD114ィエD1C dated with the Tandetron AMS at Nagoya University. The outer for samples showed older ages than expected preferably owing to carbon contamination from carbonaceous materials surrounding the sample, when it had been buried in the sediment. The ィイD114ィエD1C ages of the 5th to 12th rings counted from the outermost ring, were consistent with the standard ィイD114ィエD1C age for dendrochronologically dated wood decadal rings, presented by Stuiver et al. (1998). This suggested that the estimation of the eruption of Hakuto-san volcano by Fukusawa (1999) is acceptable. For other wood samples of relatively younger ages were dated with high precision better than ± to ± 60 years. Less

本研究的目的是使用名古屋大学的高性能AMS AMS D114同位素D1C测年系统对埋藏的木材样品进行高精度的同位素D114同位素D1C测年。在过去的两年中，这台机器经常发生故障，这妨碍了实验的顺利进行。但是，成功进行了以下研究。(1)对位于中朝边境的白户山火山喷发产生的火山碎屑流沉积物所掩埋的树干上覆盖了30年的连续年轮样品进行了AMSD114碳同位素D1C测年，（2）对湖泊沉积物中提取的有机碳进行了AMSD114碳同位素D1C测年，（3）对许多树木样品进行了AMSD114碳同位素D1C测年。成功地对NBS草酸标准品D114草酸D1C/D112草酸D1C进行了重复性试验，重复性范围为± 14~± 33年。其次，成功地测试了D114-D1C测年系统的准确性 ...更多信息 10世纪初，白藤山火山爆发，被认为对曾经统治中国东北大部分地区的Bokkai Dinasty的毁灭造成了悲惨的破坏。通过分析青森县小川原湖沉积物中出现的纹泥，由泽（1999）推测喷发年代为公元937年或938年。所有37个年轮都是用手分离的，外30个年轮是用名古屋大学的Tandetron AMS测年的D114年D1C。样本的外部显示出比预期更老的年龄，这可能是由于样本被埋在沉积物中时，样本周围的含碳物质造成的碳污染。从最外层开始计算的第5至第12轮的D114-D1C年龄与Stuiver等人（1998）提出的树木年代学年代测定的木材十年轮的标准D114-D1C年龄一致。这表明，Hakuusawa（1999）对白藤山火山喷发的估计是可以接受的。对于其他年龄相对较低的木材样品，其测年精度高于± 60年。少