Absolute and relative dating of human remains in a Bahamian sinkhole (Great Cistern, Abaco)
Absolute and relative dating of human remains in a Bahamian sinkhole (Great Cistern, Abaco)
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DOI：
10.1016/j.jasrep.2020.102441
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发表时间：
2020-08-01
影响因子：
1.6
通讯作者：
Albury, Nancy A.
中科院分区：
文献类型：
--
作者：
Sullivan, Richard M.;van Hengstum, Peter J.;Albury, Nancy A.
小巴哈马浅滩可能是北大西洋热带地区卢卡扬土著人殖民的最后一个岛屿群，但保存完好的卢卡扬遗迹在这一地区很少见。此外，卢卡扬饮食包括海洋和陆地的贡献，这必须考虑到校准常规放射性碳结果时，从人类遗骸到共同时代（CE）日历年。在这里，我们提出了一个新的发现Lucayan仍然（右胫骨近端骨骺）确定在大阿巴科岛在巴哈马群岛北方，这是保存在非常好的沉积填充物（与22个独立的放射性碳年龄）天坑。人类胫骨的年龄是通过相关的地层学（相对年龄）和骨骼的直接放射性碳测年（绝对年龄）来估计的。通过使用双端元混合模型来校准骨骼的直接年龄，以估计海洋与陆地对该个体饮食的贡献的平均比例，使用骨骼胶原蛋白的Δ C-13值并应用区域水生环境的局部Δ R值。绝对测年法将大蓄水池中的遗骸的年龄定在公元1255年至1340年之间（2西格玛，概率：0.89）。将相同的混合模型应用于之前在大阿巴科岛Sawmill Sink发现的遗骸，表明这些遗骸实际上比之前的估计年轻100到200年，可能发生在1110到1290 CE之间（2 sigma，概率：0.95）。
The Little Bahama Bank was likely the last island group colonized by the Lucayan natives in the tropical North Atlantic, but preserved Lucayan remains are rare from this region. Furthermore, the Lucayan diet included both marine and terrestrial contributions, which must be considered when calibrating conventional radiocarbon results from human remains into Common Era (CE) calendar years. Here we present a new discovery of Lucayan remains (proximal epiphysis of a right tibia) identified within a sinkhole on Great Abaco Island in the northern Bahamas, which was preserved in the extremely well-dated sedimentary infill (dated with 22 independent radiocarbon ages). The age of the human tibia was estimated through both the associated stratigraphy (relative age), and direct radiocarbon dating of the bone (absolute age). The direct age of the bone was calibrated by using a two-endmember mixing model to estimate the average proportion of marine versus terrestrial contributions to this individuals' diet using the delta C-13 value of the bone collagen and applying a local Delta R value for regional aquatic settings. Absolute dating places the age of the remains from Great Cistern between 1255 and 1340 CE (2 sigma, probability: 0.89). Applying the same mixing model to the previously discovered remains from Sawmill Sink on Great Abaco Island indicates those remains are in fact 100 to 200 years younger than the previous estimate with internment likely occurring between 1110 and 1290 CE (2 sigma, probability: 0.95).