Evidence of a shallow magma reservoir below Los Humeros volcanic complex: Insights from the geochemistry of silicate melt inclusions
Por:
Creon, Laura, Levresse, Gilles, Carrasco-Nunez, Gerardo, Remusat, Laurent
Publicada:
1 dic 2018
Resumen:
Los Humeros volcanic complex (Eastern Trans Mexican Volcanic belt) is
one of the three most important geo-thermal fields in Mexico and is
currently producing electricity (ca. 90 MW). It-is therefore
pertinent-to-coistrain the magma chamber characteristics, such as its
depth, and the magmatic evolution of the complex in order to better
define the superficial geothermal activity. In this paper we present the
first geochemical data (major and trace elements) for 15 silicate melt
inclusions and their five host rocks from Los Humeros volcanic complex.
We constrained the evolution of the volcanic complex by coupling X-ray
spectrometry, ICP-MS, microprobe, X-ray microtomography and NanoSIMS
analyses together with thermodynamical modeling on both whole rocks and
silicate melt inclusions.
A ponding reservoir located within an interval betwwen 5 and 13 km at
depth is evidenced by silicate melt inclusions entrapment pressures.
This ponding depth's interval is in agreement with previous studies by
thermal modeling, resistivity and geobaromatry done in the same area.
The geothermal activity of Los Humeros volcanic area is expected to be
the result of the cooling of the magma in the shallow chamber. A large
geochemical variability, in less than 1 Ma, is demonstrated by trace and
volatile element compositions evolution through time. Subduction
contamination is expected into the mantle source with the highest
contamination event at 69 Ka, during the second caldera event of Los
Humeros volcanic complex.
Filiaciones:
Creon, Laura:
Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla No. 3001, Querétaro, 76230, Mexico
Laura Créon, Geosciences Le Mans, Le Mans Université, UFR Sciences et techniques, Avenue Olivier Messiaen, Le Mans Cedex 9, 72085, France
Univ Nacl Autonoma Mexico, Ctr Geociencias, Blvd Juriquilla 3001, Queretaro 76230, Mexico
Le Mans Univ, Geosci Le Mans, UFR Sci & Tech, Ave Olivier Messiaen, F-72085 Le Mans 9, France
Levresse, Gilles:
Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla No. 3001, Querétaro, 76230, Mexico
Univ Nacl Autonoma Mexico, Ctr Geociencias, Blvd Juriquilla 3001, Queretaro 76230, Mexico
Carrasco-Nunez, Gerardo:
Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla No. 3001, Querétaro, 76230, Mexico
Univ Nacl Autonoma Mexico, Ctr Geociencias, Blvd Juriquilla 3001, Queretaro 76230, Mexico
Remusat, Laurent:
Muséum National d'Histoire Naturelle, Sorbonne Université, UMR CNRS 7590, IRD, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, Paris, 75005, France
Sorbonne Univ, Museum Natl Hist Nat, UMR CNRS 7590, IRD,IMPMC, F-75005 Paris, France
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