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https://doi.org/10.5194/se-2020-168
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-168
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 Oct 2020

06 Oct 2020

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This preprint is currently under review for the journal SE.

Comment on Estimating the depth and evolution of intrusions at resurgent calderas: Los Humeros (Mexico) by Urbani et al. (2020)

Gianluca Norini and Gianluca Groppelli Gianluca Norini and Gianluca Groppelli
  • Istituto di Geologia Ambientale e Geoingegneria, Sezione di Milano, Consiglio Nazionale delle Ricerche, Italy

Abstract. A multiple shallow–seated magmatic intrusions model has been proposed by Urbani et al. (2020) for the resurgence of the Los Potreros caldera floor, in the Los Humeros Volcanic Complex. This model predicts (1) the occurrence of localized bulges in the otherwise undeformed caldera floor, and (2) that the faults corresponding to different bulges exhibit different spatial and temporal evolution. Published data and a morphological analysis show that these two conditions are not met at Los Potreros caldera. A geothermal well (H4), located at the youngest supposed bulge (Loma Blanca) for which Urbani et al. (2020) calculated an intrusion depth (425±170 m), doesn’t show any thermal and lithological evidence of such a shallow–seated cryptodome. Finally, published stratigraphic data and radiometric dating disprove the proposed common genesis of Holocene resurgence faulting and viscous lavas extruded in the centre of the caldera. Even if recent shallow intrusions may exist in the area, published data indicate that the pressurization of the LHVC magmatic/hydrothermal system driving resurgence faulting occurs at greater depth. Thus, we suggest that the model and calculation proposed by Urbani et al. (2020) are unlikely to have any relevance to the location, age and emplacement depth of magma intrusions driving resurgence at the Los Potreros caldera.

Gianluca Norini and Gianluca Groppelli

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Gianluca Norini and Gianluca Groppelli

Gianluca Norini and Gianluca Groppelli

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Latest update: 24 Oct 2020
Publications Copernicus
Short summary
We identified several problems in the Urbani et al. (2020) study, showing that their model does not conform to the age and location of faulting, identification and delimitation of uplifted areas and apical depressions, temperature and lithological wells log, and stratigraphic and radiometric data. Published data indicate that the pressurization of the LHVC magmatic/hydrothermal system driving resurgence faulting occurs at greater depth.
We identified several problems in the Urbani et al. (2020) study, showing that their model does...
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