Magnetic links among lava flows, tuffs and the underground plumbing system in a monogenetic volcano, derived from magnetics and paleomagnetic studies
Por:
Urrutia-Fucugauchi, J, Trigo-Huesca, A, Perez-Cruz, L
Publicada:
1 dic 2012
Resumen:
A combined study using magnetics and paleomagnetism of the Toluquilla monogenetic volcano and associated lavas and tuffs from Valsequillo basin in Central Mexico provides evidence on a 'magnetic' link between the lavas, ash tuffs and the underground volcanic conduit system. Paleomagnetic analyses show that the lava and ash tuff carry reverse polarity magnetizations, which correlate with the inversely polarized dipolar magnetic anomaly over the volcano. The magnetizations in the lava and tuff show similar southward declinations and upward inclinations, supporting petrological inferences that the tuff was emplaced while still hot and indicating a temporal correlation for lava and tuff emplacement. Modeling of the dipolar anomaly gives a reverse polarity source magnetization associated with a vertical prismatic body with southward declination and upward inclination, which correlates with the reverse polarity magnetizations in the lava and tuff. The study documents a direct correlation of
Filiaciones:
Urrutia-Fucugauchi, J:
Univ Nacl Autonoma Mexico, Inst Geofis, Lab Paleomagnetismo & Paleoambientes, Mexico City 04510, DF, Mexico
Trigo-Huesca, A:
Univ Nacl Autonoma Mexico, Inst Geofis, Lab Paleomagnetismo & Paleoambientes, Mexico City 04510, DF, Mexico
Perez-Cruz, L:
Univ Nacl Autonoma Mexico, Inst Geofis, Lab Paleomagnetismo & Paleoambientes, Mexico City 04510, DF, Mexico
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