Late Pleistocene flank collapse of Zempoala volcano (Central Mexico) and the role of fault reactivation
Por:
Arce J.L., Macías R., Palomo, AG, Capra L., Macías J.L., Layer P., Rueda H.
Publicada:
20 nov 2008
Resumen:
Zempoala is an extinct Pleistocene (similar to 0.7-0.8 Ma) stratovolcano that together with La Corona volcano (similar to 0.9 Ma) forms the southern end of the Sierra de las Cruces volcanic range, Central Mexico. The volcano consists of andesitic and dacitic lava flows and domes, as well as pyroclastic and epiclastic sequences, and has had a complex history with several flank collapses. One of these collapses occurred during the late Pleistocene on the S-SE flank of the volcano and produced the Zempoala debris avalanche deposit. This collapse could have been triggered by the reactivation of two normal fault systems (E-W and NE-SW), although magmatic activity cannot be absolutely excluded. The debris avalanche traveled 60 km to the south, covers an area of 600 km(2) and has a total volume of 6 km(3), With a calculated Heim coefficient (H/L) of 0.03. Based on the textural characteristics of the deposit we recognized three zones: proximal, axial, and lateral distal zone. The proximal zone
Filiaciones:
Arce J.L.:
Univ Nacl Autonoma Mexico, Inst Geol, Dept Reg Geol, Mexico City 04510, DF, Mexico
Macías R.:
Univ Nacl Autonoma Mexico, Inst Geol, Dept Reg Geol, Mexico City 04510, DF, Mexico
Palomo, AG:
Univ Nacl Autonoma Mexico, Inst Geol, Dept Reg Geol, Mexico City 04510, DF, Mexico
Capra L.:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Juriquilla, Qro, Mexico
Macías J.L.:
Univ Nacl Autonoma Mexico, Inst Geofis, Dept Vulcanol, Mexico City 04510, DF, Mexico
Layer P.:
Geophysical Institute, Department of Geology and Geophysics, University of Alaska, Fairbanks, AK 99775-7320, United States
Rueda H.:
Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Coyoacan, Mexico, D.F. 04510, Mexico
|