Paleomagnetism of Holocene lava flows from Los Humeros caldera, eastern Mexico: Discrimination of volcanic eruptions and their age dating

Juárez-Arriaga, Erick; Böhnel, Harald; Carrasco-Núñez, Gerardo; Mahgoub, Ahmed Nasser

doi:10.1016/j.jsames.2018.10.008

Cited by 12 publications

(10 citation statements)

References 38 publications

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“…Based on the proposed U2020 uplift model, it means that shallow intrusions of small magmatic bodies and, consequently, the volcanic feeding system moved progressively northwards. This statement presents some discrepancies with the stratigraphy, geology and radiometric ages recently published by some of the U2020 authors (Carrasco-Núñez et al, 2017Juárez-Arriaga et al, 2018), as summarised by the following points: a) An obsidian dome (Qr1 Rhyolite of Carrasco-Núñez et al, 2017) has been dated using the U/Th method at 44.8±1.7 ka by Carrasco-Núñez et al (2017. Its location corresponds to the obsidian dome cropping out along the Los Humeros fault described in U2020 and connected with the syn-to post-Cuicuiltic Member eruption (7.3-3.8 ka) (Fig.…”

Section: Stratigraphy and Radiometric Agescontrasting

confidence: 61%

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

Norini¹,

Groppelli²

2020

Preprint

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Abstract. A multiple 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 few localized bulges in the otherwise not deformed caldera floor, and (2) that the faults corresponding to different bulges exhibit different spatial and temporal evolution. Already available field data from easily accessible outcrops and a simple morphological analysis show that these two conditions are not met at Los Potreros caldera. Also, a geothermal well (H4), located in the most recent supposed bulge for which Urbani et al. (2020) calculated an intrusion depth (Loma Blanca, intrusion depth of 425 ± 170 m), doesn't show any thermal and lithological evidence of such a shallow cryptodome. Finally, already published stratigraphic data and radiometric dating apparently disprove the proposed correlation between extruded viscous lavas and faulting. Thus, even if recent shallow intrusions may exist in the area, Urbani et al. (2020) fails to provide any useful information on their occurrence, location, age, emplacement depth, role in the resurgence of the Los Potreros caldera floor, and influence on the structure of the Los Humeros geothermal field.

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Section: Stratigraphy and Radiometric Agescontrasting

confidence: 61%

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

Norini¹,

Groppelli²

2020

Preprint

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show abstract

“…consequently, the volcanic feeding system moved progressively northwards. This statement presents some discrepancies with the stratigraphy, geological mapping and radiometric ages published recently (Carrasco-Núñez et al, 2017Juárez-Arriaga et al, 2018), as summarised by the following points: a) An obsidian dome (Qr1 Rhyolite of Carrasco-Núñez et al, 2017) has been dated using the U/Th method at 44.8±1.7 ka by Carrasco-Núñez et al (2017. Its location corresponds to the obsidian dome cropping out along the Los Humeros fault described in U2020 and connected with the syn-to post-Cuicuiltic Member eruption (7.3-3.8 ka) (Fig.…”

Section: /12contrasting

confidence: 60%

“…Figure 5: map of the post-Cuicuiltic Member vents and ages based on radiometric data, paleomagnetic analysis or inferred from geological map (Carrasco-Núñez et al, 2017Juárez-Arriaga et al, 2018). The post-Cuicuiltic Member uplifted areas and obsidian dome proposed by U2020 are also shown.…”

Section: Resultsmentioning

confidence: 99%

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

Norini¹,

Groppelli²

2020

Preprint

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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.

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“…The U2020 description of their LH-08 outcrop can be explained by erosive retreat of the fault scarp, a common process in dip-slip faults, especially in poorly consolidated sediments (e.g. Keller and Pinter, 2002;Burbank and Anderson, 2011).…”

Section: Las Papas and Las Viboras Faultsmentioning

confidence: 99%

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

Norini

Groppelli

2020

Solid Earth

View full text Add to dashboard Cite

Abstract. A multiple shallow-seated magmatic intrusion model has been proposed by Urbani et al. (2020) for the resurgence of the Los Potreros caldera floor, in the Los Humeros volcanic complex (LHVC). 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), does not 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 do 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.

show abstract

Paleomagnetism of Holocene lava flows from Los Humeros caldera, eastern Mexico: Discrimination of volcanic eruptions and their age dating

Cited by 12 publications

References 38 publications

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

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

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

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

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