Magma plumbing system below the Popocatepetl and Iztaccihuatl volcanoes, central Mexico, as revealed by aeromagnetic data
Por:
Lopez-Loera, H., Espindola, J. M., Sosa-Ceballos, G., Macias, J. L., Urrutia-Fucugauchi, J., Torres-Gaytan, D. E., Garcia-Tenorio, F.
Publicada:
1 abr 2022
Categoría:
Geochemistry and petrology
Resumen:
One of the principal tasks of volcanology is to infer the eruptive
history of volcanoes. However, the processes culminating in volcanic
events include many occurring under the surface; thus, a complete
understanding of magmatic activity requires information on the
subsurface magmatic bodies. Such information is crucial in the case of
large active volcanoes. This paper analyzed the aeromagnetic data from a
survey performed through the Iztaccihuatl and Popocatepetl volcanoes in
central Mexico, as examined in the light of the petrology and geology of
the area. To achieve this objective, we processed the residual magnetic
field of the area to obtain the geomagnetic anomalies due to bodies of
contrasting magnetic susceptibility. We obtained improved imaging of the
anomalies through several techniques and defined a pattern of anomalies
grouped in six aeromagnetic domains (AMD). A large domain (AMD I) holds
positive anomalies with maxima around the volcanoes. The inverted data
yielded models of the main bodies under the large volcanoes, which
extended into other smaller structures or sites without emergence to the
surface. Large magma bodies stalled below Popocatepetl (similar to 54.5
km(3)) and Iztaccihuatl (similar to 30.5 km(3)); they contrast in volume
with the irregularly shaped Paso de Cortes intrusion (4.7 km(3)), which
halted at a depth of 1.6 km. The latter intrusion is likely associated
with mush-like bodies formed by magmas from the Popocatepetl plumbing
system forced away from the volcano's principal network of conduits. The
positive intensity of magnetization of the bodies suggests they are of
mafic composition and were intruded into silicic rocks.
Filiaciones:
(Corresponding Author), Inst Potosino Invest Cient & Tecnol, Geociencias Aplicadas, AC Camino La Presa San Jose 2055, San Luis Potosi 78216, San Luis Potosi, Mexico
Inst Potosino Invest Cient & Tecnol, Geociencias Aplicadas, AC Camino La Presa San Jose 2055, San Luis Potosi 78216, San Luis Potosi, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis, UNAM, Av Univ 3000, Cd De Mexico 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis Unidad Michoacan, Antigua Carretera Patzcuaro 8701, Morelia 58059, Michoacan, Mexico
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