New 14C Determinations from Lake Suigetsu, Japan: 12,000 to 0 Cal BP
New 14C Determinations from Lake Suigetsu, Japan: 12,000 to 0 Cal BP
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DOI：
10.1017/s0033822200034627
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发表时间：
2011-09
期刊：
影响因子：
8.3
通讯作者：
R. Staff;C. Bronk Ramsey;C. Bryant;F. Brock;R. L. Payne;G. Schlolaut;M. Marshall;A. Brauer;H. Lamb;P. Tarasov;Y. Yokoyama;T. Haraguchi;K. Gotanda;H. Yonenobu;T. Nakagawa
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文献类型：
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作者：
R. Staff;C. Bronk Ramsey;C. Bryant;F. Brock;R. L. Payne;G. Schlolaut;M. Marshall;A. Brauer;H. Lamb;P. Tarasov;Y. Yokoyama;T. Haraguchi;K. Gotanda;H. Yonenobu;T. Nakagawa
校准是放射性碳（14 C）定年过程的一个基本阶段，如果要从样品的14 C测量结果中得出有意义的日历年龄。IntCal 09校准曲线（Reimer等人，2009年）首次提供了国际认可的校准数据集，几乎涵盖了14 C时标的整个范围（0至50，000 cal BP）。然而，只有最后的12,550卡年的记录是由陆地数据，留下约四分之三的14 C时标必须通过不太安全的，海洋记录（包括有关的时间变量的假设“海洋水库效应”）校准。日本中部水月湖的主要年度层压（纹状）沉积物剖面提供了一个理想的机会，通过对陆地植物宏化石样品（从沉积物中提取）的14 C测量值与通过计算其年度层压提供的独立年表配对，在整个方法范围内获得大气14 C的扩展陆地记录。本文介绍了新的数据（182 14 C测定）从上（主要是非纹）15米的水月湖（SG 06）沉积地层。这些测量提供了证据，证明在过去的~ 12，000 cal/年（即完全基于陆地数据的IntCal部分）中，水月14 C数据和IntCal 09校准曲线之间具有良好的一致性。这种一致性表明，从水月湖沉积物中采集的陆地植物材料提供了可靠的大气14 C档案，因此支持该地点能够提供高分辨率扩展“全陆地”（即非水库校正）校准曲线，超出其目前的12，550 cal BP限值。
Calibration is a fundamental stage of the radiocarbon (14C) dating process if one is to derive meaningful calendar ages from samples' 14C measurements. For the first time, the IntCal09 calibration curve (Reimer et al. 2009) provided an internationally ratified calibration data set across almost the complete range (0 to 50,000 cal BP) of the 14C timescale. However, only the last 12,550 cal yr of this record are composed of terrestrial data, leaving approximately three quarters of the 14C timescale necessarily calibrated via less secure, marine records (incorporating assumptions pertaining to the temporally variable “marine reservoir effect”). The predominantly annually laminated (varved) sediment profile of Lake Suigetsu, central Japan, offers an ideal opportunity to derive an extended terrestrial record of atmospheric 14C across the entire range of the method, through pairing of 14C measurements of terrestrial plant macrofossil samples (extracted from the sediment) with the independent chronology provided through counting of its annual laminations. This paper presents new data (182 14C determinations) from the upper (largely non-varved) 15 m of the Lake Suigetsu (SG06) sediment strata. These measurements provide evidence of excellent coherence between the Suigetsu 14C data and the IntCal09 calibration curve across the last ~12,000 cal yr (i.e. the portion of IntCal based entirely on terrestrial data). Such agreement demonstrates that terrestrial plant material picked from the Lake Suigetsu sediment provides a reliable archive of atmospheric 14C, and therefore supports the site as being capable of providing a high-resolution extension to the “wholly terrestrial” (i.e. non-reservoir-corrected) calibration curve beyond its present 12,550 cal BP limit.