Título del libro: Lake Alchichica Limnology: The Uniqueness Of A Tropical Maar Lake
Título del capítulo: Geological Evolution of the Alchichica Crater
GERARDO CARRASCO NUÑEZ; BORIS CHAKO TCHAMABE;
Autores externos:
Idioma:
Año de publicación:
2022
Palabras clave:
Alchichica; Crater lakes; Maar volcanoes; Phreatomagmatic volcanism
Resumen:
Maars are volcanic craters caused by explosive magma-water eruptions. Maar craters are generally surrounded by a low-relief tephra ring and typically filled with water, forming a relatively shallow or deep crater lake. The maar crater?s size and morphology depend on various parameters, including the nature of the substrate where the maar is cut, and the type and size of explosions involved in the eruptive process. In this chapter, the cratering process of the Alchichica maar is presented based on information retrieved from its deposit sequence. The latter consists of an alternated succession of layers dominated by pyroclastic density currents (flow) layers, intercalated with some fallout layers, grouped into a lower and an upper unit accordingly to the deposits? features. While these features reveal the wet conditions present during the eruption process and mainly controlled by the substrate, a focus on the variation in the number of juvenile, lithic, and recycled juvenile clasts among the different units indicates that the cratering process during both the vent-clearing stage and further explosions occurred at very shallow levels, probably limited to the upper 100 m within the substrate, leading to a shallow (60 m deep) crater after the final subsidence of diatreme infills. © 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:
Geological Evolution of the Alchichica Crater
Página inicial:
15
Página final:
32
