Mesh : Radiometric Dating / methods Ships Calibration Archaeology / methods Cyprus Carbon Radioisotopes / analysis Bayes Theorem

来  源:   DOI:10.1371/journal.pone.0302645   PDF(Pubmed)

Abstract:
The Kyrenia Ship, found off the north coast of Cyprus, is a key vessel in the history of scientific underwater excavations and in the history of Greek shipbuilding. The first volume of the site\'s final publication appeared in 2023 and provides detailed archaeological information tightly constraining the dating of the ship. A very specific date range is proposed: ca. 294-290 BCE, but is based on a less than certain reading of one coin recovered from the ship. While there is clear benefit to finding high-precision dates for the Kyrenia Ship and its rich assemblage using independent scientific dating (combined with Bayesian chronological modeling), efforts to do so proved more challenging and complex than initially anticipated. Strikingly, extensive radiocarbon dating on both wooden materials from the ship and on short-lived contents from the final use of the ship fail to offer dates using the IntCal20 calibration curve-the current Northern Hemisphere radiocarbon calibration curve at the time of writing-that correspond with the archaeological constraints. The issue rests with a segment of IntCal20 ca. 350-250 BCE reliant on legacy pre-AMS radiocarbon data. We therefore measured new known-age tree-ring samples 350-250 BCE, and, integrating another series of new known-age tree-ring data, we obtained a redefined and more accurate calibration record for the period 433-250 BCE. These new data permit a satisfactory dating solution for the ship and may even indicate a date that is a (very) few years more recent than current estimations. These new data in addition confirm and only very slightly modify the dating recently published for the Mazotos ship, another Greek merchant ship from the southern coast of Cyprus. Our work further investigated whether ship wood samples impregnated with a common preservative, polyethylene glycol (PEG), can be cleaned successfully, including a known-age test.
摘要:
凯里尼亚号船,在塞浦路斯北海岸发现,是科学水下挖掘历史和希腊造船历史上的重要船只。该网站最终出版物的第一卷出现在2023年,提供了详细的考古信息,严格限制了这艘船的年代。提出了一个非常具体的日期范围:ca。294-290BCE,而是基于从船上回收的一枚硬币的读数不到一定。虽然使用独立的科学测年(结合贝叶斯时间顺序建模)为凯里尼亚船及其丰富的组合找到高精度日期显然是有好处的,事实证明,这样做的努力比最初预期的更具挑战性和复杂性。引人注目的是,船上的木质材料和最终使用船上的短命内容物上的大量放射性碳测年都未能提供使用IntCal20校准曲线的日期-撰写本文时当前的北半球放射性碳校准曲线-符合考古限制。问题在于IntCal20ca的一部分。350-250BCE依赖于传统的AMS前放射性碳数据。因此,我们测量了公元前350-250年的新已知年龄的树木年轮样本,and,整合另一系列新的已知年龄的树木年轮数据,我们获得了BCE433-250期的重新定义且更准确的校准记录.这些新数据为船舶提供了令人满意的约会解决方案,甚至可能表明比当前估计晚(非常)几年的日期。这些新数据还证实了并且仅对最近为Mazotos船发布的约会进行了非常轻微的修改,另一艘来自塞浦路斯南部海岸的希腊商船。我们的工作进一步调查了船舶木材样品是否浸渍了常见的防腐剂,聚乙二醇(PEG),可以成功清理,包括已知年龄测试。
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