Reconstrucción paleoambiental de la subcuenca de Xochimilco, centro de México, entre 18000 y 5000 años antes del presente

A paleoenvironmental reconstruction of the Xochimilco sub-basin, central Mexico, reveals significant millennial-scale climatic oscillations between 18,000 and 5,000 years ago. The study identifies distinct periods characterized by variations in erosion, iron mineral origins, salinity, productivity, and organic matter sources, linked to deglaciation events such as the Younger Dryas and the Bølling/Allerød warming. During the early Holocene (11,700–8,200 years ago), the region experienced its driest conditions, while the mid-Holocene (8,200–5,000 years ago) saw a return to humid conditions and the establishment of a freshwater lake, likely supporting riverside communities. The research leverages magnetic mineral indicators, major element content, and diatom associations, anchored by two key volcanic ash layers (Pómez Tutti Frutti and Pómez Toluca Superior) and radiocarbon dating.

Ortega-Guerrero, B., Albarrán-Santos, M. A., Caballero, M., Reyes-Corona, I., Gutiérrez-Méndez, B., & Caballero-García, L. (2018). Reconstrucción paleoambiental de la subcuenca de Xochimilco, centro de México, entre 18000 y 5000 años antes del presente. Revista Mexicana de Ciencias Geológicas, 35(3), 254–267. https://doi.org/10.22201/cgeo.20072902e.2018.3.779