Expanding radiogenic strontium isotope baseline data for central Mexican paleomobility studies
Expanding radiogenic strontium isotope baseline data for central Mexican paleomobility studies
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DOI：
10.1371/journal.pone.0229687
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发表时间：
2020-02
期刊：
影响因子：
3.7
通讯作者：
Sofía I Pacheco-Forés;G. Gordon;K. Knudson
中科院分区：
文献类型：
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作者：
Sofía I Pacheco-Forés;G. Gordon;K. Knudson
放射性成因锶同位素(~(87)Sr/~(86)Sr)长期以来一直被用于分析中美大陆的古流动性。虽然在玛雅地区已经花费了相当大的努力来制定87锶/86锶基准值，但墨西哥中部的工作主要集中在特奥蒂瓦坎的古典时期城市中心。这项研究增加了这一重要的数据集，提供了整个墨西哥中部的生物可用87锶/86锶值，重点是墨西哥盆地。因此，这项研究有助于将锶同位素的用途扩大到更广泛的地理区域。共采集了墨西哥中部13个地点的63个植物和水样，在Thermo-Finnigan海王星多收集器电感耦合等离子体质谱仪(MC-ICP-MS)上进行了87Sr/86Sr分析。这些数据与来自感兴趣区域内另外两个地点的16个已公布的87Sr/86Sr值一起进行了分析。然后建立了一个五星团k-Means模型，以确定墨西哥盆地和大墨西哥中部的哪些区域可以和不可以使用87Sr/86Sr值进行同位素区分。尽管墨西哥盆地内的两个星系团在其当地的87Sr/86Sr范围内重叠，但盆地内的许多位置可以从场地级别的87Sr/86Sr值中区分出来。这项研究通过扩大区域内锶同位素变异性的知识，最终使研究人员能够检测区域内的居民流动性，并更好地了解墨西哥盆地与支持墨西哥中部边远地区之间的社会政治互动，从而为墨西哥中部内的古迁移性研究做出了贡献。
Radiogenic strontium isotopes (87Sr/86Sr) have long been used in analyses of paleomobility within Mesoamerica. While considerable effort has been expended developing 87Sr/86Sr baseline values across the Maya region, work in central Mexico is primarily focused on the Classic period urban center of Teotihuacan. This study adds to this important dataset by presenting bioavailable 87Sr/86Sr values across central Mexico focusing on the Basin of Mexico. This study therefore serves to expand the utility of strontium isotopes across a wider geographic region. A total of 63 plant and water samples were collected from 13 central Mexican sites and analyzed for 87Sr/86Sr on a Thermo-Finnigan Neptune multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS). These data were analyzed alongside 16 published 87Sr/86Sr values from two additional sites within the region of interest. A five-cluster k-means model was then generated to determine which regions of the Basin of Mexico and greater central Mexico can and cannot be distinguished isotopically using 87Sr/86Sr values. Although the two clusters falling within the Basin of Mexico overlap in their local 87Sr/86Sr ranges, many locations within the Basin are distinguishable using 87Sr/86Sr values at the site-level. This study contributes to paleomobility studies within central Mexico by expanding knowledge of strontium isotope variability within the region, ultimately allowing researchers to detect intra-regional residential mobility and gain a greater understanding of the sociopolitical interactions between the Basin of Mexico and supporting outlying regions of central Mexico.