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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

本研究的目的是利用名古屋大学的高性能AMS γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。在过去的两年中，机器的故障频繁发生，这阻碍了实验的顺利进行。然而，下面的研究是成功地进行的。(1)对中朝边境白东山火山喷发形成的火山碎屑流沉积物所埋藏的一根树干的连续年轮样品进行了AMS - D114 - D1C测年；(2)对湖泊沉积物中提取的有机碳进行了AMS - D114 - D1C测年；(3)对大量木本样品进行了AMS - D114 - D1C测年。首先，成功地对NBS草酸标准品进行了φ 114φ D1C/ φ 112φ D1C测量的重复性试验，重复性为±14 ~±33年。接下来，成功地对八个已知年龄的IAEA样品进行了勘定年系统的准确性测试。博东山火山在10世纪初爆发，这被认为对曾经统治中国东北部大片地区的博凯王朝的毁灭造成了悲剧性的破坏。福泽（1999）分析了青森县小原湖湖泊沉积物中出现的碎屑，估计火山喷发的年龄为公元937年或938年。37个年轮全部手工分离，外30个年轮用名古屋大学的Tandetron AMS测年。样品的外部显示出比预期的更古老的年龄，最好是由于样品周围的碳质物质被碳污染，当它被埋在沉积物中。的ィイD114ィエD1C 5 - 12日环从最外层的戒指,计算符合标准ィイD114ィエD1C年龄dendrochronologically过时木十的戒指,由Stuiver et al。(1998)。这说明福泽（1999）对博东山火山喷发的估计是可以接受的。对于年龄相对较低的其他木材样品，测年精度高于±至±60年。少