Abstract This work presents the results of the petrographic and geochemical characterization of pyroclastic deposits outcropping in an area located to the northeast and southeast of Los Humeros Volcanic Complex, in the eastern part of the Trans-Mexican Volcanic Belt (TMVB). The results were compared with the analyses of aggregates in the plasters of Xalla in Teotihuacan (Mexico) in order to determine the provenance of the raw materials (in particular glass shards) used as aggregates. The characterization of the deposits and the raw materials used in the plasters was conducted by OM, SEM/EDS and LA-ICP-MS. Petrographic and geochemical studies have highlighted the geochemical similarity among glass shards used as aggregates in the plasters of Teotihuacan (Teopancazco and Xalla) and the pyroclastic deposits outcropping around Altotonga, a town located in the northeast of Los Humeros Caldera. This similarity shows the importance of the use of a volcanic cinder, rich in glass shards, in plasters from different areas of the Teotihuacan city. The paper also examines the characteristics of plasters – in some cases painted – from Xalla, thus confirming the re-plastering and re-painting phenomena and the use of hematite, identified by Raman Spectroscopy.

中文翻译：

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特奥蒂瓦坎（墨西哥）灰泥中用作骨料的 Los Humeros 火山碎屑沉积物的地球化学和岩石学特征

摘要 这项工作介绍了对位于跨墨西哥火山带 (TMVB) 东部洛斯休梅罗斯火山群东北部和东南部地区出露的火山碎屑沉积物的岩石学和地球化学特征的结果。将结果与特奥蒂瓦坎（墨西哥）Xalla 石膏中的骨料分析进行比较，以确定用作骨料的原材料（特别是玻璃碎片）的来源。通过 OM、SEM/EDS 和 LA-ICP-MS 对沉积物和石膏中使用的原材料进行表征。岩石学和地球化学研究强调了特奥蒂瓦坎（特奥潘卡斯科和哈拉）石膏中用作骨料的玻璃碎片与阿尔托汤加周围露头的火山碎屑沉积物之间的地球化学相似性，位于洛斯休梅罗斯火山口东北部的一个小镇。这种相似性表明在特奥蒂瓦坎市不同地区的灰泥中使用富含玻璃碎片的火山灰的重要性。该论文还检查了来自 Xalla 的灰泥（在某些情况下是涂漆的）的特性，从而证实了拉曼光谱确定的重新抹灰和重新上漆的现象以及赤铁矿的使用。