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Strontium isotope evidence of migration and diet in relation to ritual tooth ablation: a case study from the Inariyama Jomon site, Japan

机译:锶同位素证据表明与习惯性牙齿消融有关的迁移和饮食:以日本稻荷山绳文遗址为例

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Ritual tooth ablation was extensively practiced among Jomon (Japanese Neolithic) societies in their final phase (ca. 3000-2300 BP). This tradition includes two different tooth ablation patterns, type 41 and type 2C, referring to extraction of the mandibular incisors and canines, respectively. However, the reason for this difference is unclear. Previous carbon and nitrogen stable isotope analysis of human remains from the lnariyama shell mound revealed that type 41 individuals were more dependent on terrestrial resources and type 2C individuals on marine resources. To test this hypothesis, we performed strontium (Sr) isotope (Sr-87/Sr-86) analyses on the same skeletal remains and on modern plants around the site. Because Sr isotope ratios of plants differ according to the local geology and seawater has a consistent Sr isotope ratio, the Sr isotope ratios of tooth enamel can reveal both migration and diet. Comparing Sr isotope ratios in plants and seawater with those of tooth enamel, we identified four possible immigrants. Type 41 locals had significantly higher Sr isotope ratios than type 2C locals. The ratios of the type 41 and type 2C locals were close to those of terrestrial plants and seawater, respectively, suggesting that type 41 locals had incorporated much Sr from terrestrial resources and type 2C locals from marine resources. These results support the hypothesis that ritual tooth ablation reflects dietary differences throughout an individual's life, and they suggest possible occupational differentiation among the Jomon people.
机译:在绳文(日本新石器时代)社会的最后阶段(约3000-2300 BP),人们广泛采用了仪式牙齿消融术。这种传统包括两种不同的牙齿消融方式,分别是41型和2C型,分别涉及下颌切牙和犬齿的拔除。但是,这种差异的原因尚不清楚。先前对Inariyama贝壳丘的人类遗体进行碳和氮稳定同位素分析后发现,类型41的个体更依赖陆地资源,而类型2C的个体更依赖海洋资源。为了验证该假设,我们对同一骨骼遗骸和该地点周围的现代植物进行了锶(Sr)同位素(Sr-87 / Sr-86)分析。由于植物的Sr同位素比率根据当地地质情况而有所不同,并且海水具有一致的Sr同位素比率,因此牙釉质的Sr同位素比率可以显示迁移和饮食。比较植物和海水中的Sr同位素比率与牙釉质的比率,我们确定了四种可能的移民。 41型本地人的Sr同位素比明显高于2C型本地人。 41型和2C型本地人的比例分别接近陆生植物和海水的比率,这表明41型本地人吸收了来自陆生资源的Sr和2C型本地人吸收了海洋资源。这些结果支持假牙消融反映个人一生中饮食差异的假说,并且它们表明绳纹人之间可能存在职业差异。

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