Título del libro: Lake Alchichica Limnology: The Uniqueness Of A Tropical Maar Lake
Título del capítulo: Paleoenvironmental Change in Central Mexico During the Last 20, 000 Years
MARGARITA ERNA CABALLERO MIRANDA; MARIA DEL SOCORRO LOZANO GARCIA; BEATRIZ ORTEGA GUERRERO;
Autores externos:
Idioma:
Año de publicación:
2022
Palabras clave:
Deglaciation; Eastern Mexico; Holocene; Late Pleistocene; Paleoenvironments
Resumen:
In this chapter a general view on the paleoclimatic and paleoenvironmental evolution of the eastern basins in the Trans Mexican Volvanic Belt (central Mexico) during the last 20, 000 yr. BP is presented. It includes glaciar geomorphology data from Iztaccihuatl and Cofre de Perote volcanoes as well as lacustrine records from Upper Lerma, Mexico, Puebla-Tlaxala and Oriental basins. During the full glacial (20, 000-15, 000 yr. BP) the climate was about 4 °C cooler than present, with low evaporation rates, and arid periods identified by 19, 000 yr. BP and during Heinrich Stadial 1 (17, 000-16, 000 yr. BP). Colder colditions were associated with open forests, a lowering of vegetation bands of about 1000 m asl, and a correspondent expantion of glaciar ice cover on the mountains higher than 3800 m asl. During the deglaciation (15, 000-11, 500 yr. BP) ice retreated and arboreal vegetation recovered, increasing its density and altitudianal distribution as climate rapidly warmed (2-2.5 °C); but a cold oscilacion (Younger Dryas, 12, 500-11, 500 yr. BP) can be identified. The beginning of the Holocene was a period of increased evaporation, reduced lake levels and higher lake water salinities. Arboreal vegetation recovered its altitudinal distribution and ice reatreated to similar to modern altitudes by 7000 yr. BP. Another shallow water phase is identified centered at 4200 yr. BP, associated with the beginning of antropogenic impact (deforestation) in some of the basins. By 2400 yr. BP (450 BC) Zea mays appears in the Aljojuca record, and a regional drying trend is established that culminated in particularly dry conditions between AD 600 to 1100 (Epiclassic). This dry interval was associated with the abandonment of several Mesoamerican cities such as Cantona in Oriental Basin. Cold-dry conditions were again recroded during the Little Ice Age, particularly from AD 1570-1890. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2022.
Entidades citadas de la UNAM:
ISBN:
9783030790967
Editorial:
Springer International Publishing Nombre de la publicación:
Paleoenvironmental Change in Central Mexico During the Last 20, 000 Years
Página inicial:
33
Página final:
50
