Modeling Intra-Caldera Resurgence Settings: Laboratory Experiments With Application to the Los Humeros Volcanic Complex (Mexico)
Por:
Bonini, Marco, Maestrelli, Daniele, Corti, Giacomo, Del Ventisette, Chiara, Moratti, Giovanna, Carrasco-Nunez, Gerardo, Giordano, Guido, Lucci, Federico, Norini, Gianluca, Piccardi, Luigi, Urbani, Stefano, Montanari, Domenico
Publicada:
1 mar 2021
Resumen:
Scaled analogue models explored the role of different boundary
conditions in intra-caldera resurgence processes. Models investigated
the role of magma intrusion depth (ID) (Series 1), asymmetric and
symmetric caldera collapse (Series 2), as well as the presence of
existing discontinuities in the pre-volcanic substratum (Series 3) on
the style of caldera resurgence. Experimental results indicate that
different IDs resulted in different resurgence styles and structural
patterns, which evolved from piston-like resurgence, for deeper
intrusions, to intra-caldera resurgent domes for shallower intrusions.
Asymmetric collapse was typically accompanied by a tilted roof block
above the emptied analogue magma reservoir, while inherited faults
influenced significantly the deformation pattern of piston-like
resurgence. Experiments simulate many of the principal characteristics
of calderas. We compare our modeling results primarily to the Los
Potreros caldera nested within the Los Humeros Volcanic Complex, where
the largest Mexico's Quaternary eruption occurred and which hosts an
important geothermal field (eastern Trans-Mexican Volcanic Belt). A
structural field survey was conducted to identify the kinematics of
faults within the caldera and outside the volcanic edifice. The Los
Potreros caldera shows a sub-orthogonal fault pattern strikingly similar
to that of models deformed with shallow ID. We interpret this
correlation as an evidence of similarity in dynamic processes, whereby
modeling results would indicate a scaled ID of similar to 4.5 km. The
Acoculco caldera complex, in Mexico, shows a fault pattern similar to
the Los Potreros caldera, and geological information corroborates the
attribution of renewed magmatic pressure to similar IDs.
Filiaciones:
Bonini, Marco:
Consiglio Nazl Ric CNR, Ist Geosci & Georisorse, Florence, Italy
Maestrelli, Daniele:
Consiglio Nazl Ric CNR, Ist Geosci & Georisorse, Florence, Italy
Corti, Giacomo:
Consiglio Nazl Ric CNR, Ist Geosci & Georisorse, Florence, Italy
Del Ventisette, Chiara:
Consiglio Nazl Ric CNR, Ist Geosci & Georisorse, Florence, Italy
Univ Firenze, Dipartimento Sci Terra, Florence, Italy
Moratti, Giovanna:
Consiglio Nazl Ric CNR, Ist Geosci & Georisorse, Florence, Italy
Carrasco-Nunez, Gerardo:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Campus UNAM Juriquilla, Queretaro, Mexico
Giordano, Guido:
Univ Roma Tre, Dipartimento Sci, Rome, Italy
Lucci, Federico:
Univ Roma Tre, Dipartimento Sci, Rome, Italy
Norini, Gianluca:
Consiglio Nazl Ric CNR, Ist Geol Ambientale & Geoingn, Milan, Italy
Piccardi, Luigi:
Consiglio Nazl Ric CNR, Ist Geosci & Georisorse, Florence, Italy
Urbani, Stefano:
Univ Roma Tre, Dipartimento Sci, Rome, Italy
Montanari, Domenico:
Consiglio Nazl Ric CNR, Ist Geosci & Georisorse, Florence, Italy
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