The city of Teotihuacan (AD 1–550) was a major multiethnic urban center that attracted migrants from as far away as west Mexico and the Maya region. Past research in the Tlajinga district at Teotihuacan using oxygen isotopes from human remains estimated that nearly 30% of the population of Tlajinga 33, a single apartment compound, were migrants. This study takes a dual-isotope approach (87Sr/86Sr and δ18Op) to reevaluate the proportion of in-migration at Tlajinga and includes data from two additional apartment compounds, Tlajinga 17 and 18 (n = 23). New results indicate that migrants comprised ~45% of the Tlajinga population. Previously acquired radiocarbon dates combined with mortuary and isotope data suggest that immigration to Tlajinga was highest during the first centuries of compound occupation. Nevertheless, migration was a continual process throughout its history. Additionally, a new finding suggests that residents of Tlajinga 33 ingested foods with higher 87Sr/86Sr ratios than did those of Tlajinga 17 and 18. We hypothesize that the incorporation of imported lime for the nixtamalization process skewed the 87Sr/86Sr ratios of human remains, a potentially important finding for future studies at Teotihuacan.

中文翻译：

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迁移到特奥蒂瓦坎 Tlajinga 区的新视角：双同位素方法

特奥蒂瓦坎市（公元 1-550 年）是一个主要的多民族城市中心，吸引了远至墨西哥西部和玛雅地区的移民。过去在特奥蒂瓦坎的 Tlajinga 区使用人类遗骸中的氧同位素进行的研究估计，Tlajinga 33 是​​一个单一的公寓大楼，近 30% 的人口是移民。本研究采用双同位素方法（87锶/86锶和δ18○p) 以重新评估 Tlajinga 的移民比例，并包括来自另外两个公寓大楼 Tlajinga 17 和 18 的数据（n= 23)。新结果表明，移民占 Tlajinga 人口的约 45%。先前获得的放射性碳日期以及太平间和同位素数据表明，在复合占领的头几个世纪，移民到特拉金加的人数最多。然而，移民在其整个历史中是一个持续的过程。此外，一项新发现表明，Tlajinga 33 的居民摄入的食物含有较高的87锶/86Sr 比率比 Tlajinga 17 和 18 的比率高。我们假设在 nixtamalization 过程中加入进口石灰会使87锶/86人类遗骸的 Sr 比率，这是特奥蒂瓦坎未来研究的一个潜在重要发现。