Tree ring dating using oxygen isotopes: a master chronology for central England
Tree ring dating using oxygen isotopes: a master chronology for central England
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DOI：
10.1002/jqs.3115
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发表时间：
2019-08-01
影响因子：
2.3
通讯作者：
Ramsey, Christopher Bronk
中科院分区：
文献类型：
--
作者：
Loader, Neil J.;McCarroll, Danny;Ramsey, Christopher Bronk
年轮宽度树木年代学，基于年轮宽度变异的匹配模式，当树木在显著的环境（气候）压力下生长时效果最好。在英国，以及温带中纬度地区的其他地方，树木通常承受的压力很小，因此测年更加困难，而且经常失败。树木年轮中的氧同位素被动地记录了夏季降水同位素比值的变化，因此它们携带着强烈的共同信号，这为交叉定年提供了可能。一个主年表，涵盖了1200-2000 CE使用的晚木纤维素的样本从英格兰中部的氧同位素比值。两个独立的年表，开发，以验证同位素信号相结合（n = 10棵树）和方法进行了评估，通过测年木材的已知年龄和历史木材，不能通过环宽树木年代学，从内部和超越英格兰中部地区。样本和主年表之间的一致性非常强，允许对年轮比通常年轮宽度树木年代学少得多的木材进行测年。树轮氧同位素值比树轮宽度更适合相关分析，因此可以提供符合Student t分布的t值，并可以转换为误差概率。提出了一种使用“稳定同位素树木年代学”指定日期的协议，它有可能彻底改变木制结构和文物的年代测定，允许年轻，快速生长的树木的短而不变的环序列的年代测定。这样的样本在历史建筑和考古记录中很常见，直到现在，被认为是不可能的。
Ring-width dendrochronology, based on matching patterns of ring width variability, works best when trees are growing under significant environmental (climatic) stress. In the UK, and elsewhere in the temperate mid-latitudes, trees generally experience low stress, so dating is more difficult and often fails. Oxygen isotopes in tree rings passively record changes in the isotopic ratios of summer precipitation, so they carry a strong common signal, which offers potential for cross-dating. A master chronology covering the period 1200-2000 ce was constructed using the oxygen isotope ratios of the latewood cellulose of oak samples from central England. Two independent chronologies, developed to verify the isotopic signal, were combined (n = 10 trees) and the method was evaluated by dating timbers of known age and historical timbers that could not be dated by ring-width dendrochronology, from both within and beyond the central England region. The agreement between samples and the master chronology is exceptionally strong, allowing the dating of timbers with far fewer rings than is normally the case for ring-width dendrochronology. Tree-ring oxygen isotope values are more suited to correlation analysis than tree-ring widths, so it is possible to provide t-values that conform to Student's t-distribution and can be converted into probabilities of error. A protocol for assigning dates using 'stable-isotope dendrochronology' is proposed, which has the potential to revolutionize the dating of wooden structures and artefacts, allowing the dating of short and invariant ring sequences from young, fast-grown trees. Such samples are commonplace throughout the historical building and archaeological records and were, until now, considered impossible to date.