Late Holocene Malpaís de Zacapu (Michoacán, Mexico) andesitic lava flows: rheology and eruption properties based on LiDAR image - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Bulletin of Volcanology Année : 2021

Late Holocene Malpaís de Zacapu (Michoacán, Mexico) andesitic lava flows: rheology and eruption properties based on LiDAR image

Résumé

Few monogenetic eruptions that produced lava flows have occurred in historical times, limiting the observations of their impact on human settlements. However, rheological models based on morphological and petrological datasets can contribute to decipher the eruptive dynamics and durations of ancient eruptions. The Malpaís de Zacapu, a temporal-spatial monogenetic volcano cluster at the western margin of the Zacapu lacustrine basin (Michoacán, Mexico), offers a good opportunity to apply such models because of the availability of a high-resolution LiDAR topography from which detailed morphological data was extracted. The Malpaís de Zacapu comprises late Holocene lava flow fields emplaced in the last 3200 years by four different low magnitude volcanic eruptions: Infiernillo, Malpaís Las Víboras, Capaxtiro, and Malpaís Prieto. Jointly these eruptions produced thick andesitic block lava flows covering an area of 38.3 km2 with a volume of ~ 4.4 km3. The lava viscosities at eruption vents were estimated from petro-textural analyses and range between 103 and 106 Pa s, while the final flow apparent viscosities, obtained from dimensional analyses, vary from 108 to 1010 Pa s. We estimated the mean effusion rate and lava flow emplacement duration for each flow field. Results revealed that the more viscous flows, Malpaís Las Víboras and Malpaís Prieto, could have been emplaced in less than 3 years, while the more fluid Infiernillo probably took less than 1 year. In stark contrast, the morphologically different and more voluminous Capaxtiro flow field could have been emplaced in ~ 27 years. These findings can help to evaluate the impact that these eruptions had on adjacent pre-Hispanic populations, known to have inhabited the region since at least 3000 years ago.
Fichier sous embargo
Fichier sous embargo
0 11 24
Année Mois Jours
Avant la publication
lundi 24 mars 2025
Fichier sous embargo
lundi 24 mars 2025
Connectez-vous pour demander l'accès au fichier

Dates et versions

insu-03708928 , version 1 (14-11-2022)

Identifiants

Citer

Nanci Reyes-Guzmán, Claus Siebe, Magdalena Oryaëlle Chevrel, Gregory Pereira. Late Holocene Malpaís de Zacapu (Michoacán, Mexico) andesitic lava flows: rheology and eruption properties based on LiDAR image. Bulletin of Volcanology, 2021, 83 (4), pp.28. ⟨10.1007/s00445-021-01449-0⟩. ⟨insu-03708928⟩
153 Consultations
13 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More