Reconstructing the middle to late Pleistocene explosive eruption histories of Popocatépetl, Iztaccíhuatl and Tláloc-Telapón volcanoes in Central México

Sunyé-Puchol, I. et al. (2022) Reconstructing the middle to late Pleistocene explosive eruption histories of Popocatépetl, Iztaccíhuatl and Tláloc-Telapón volcanoes in Central México. Journal of Volcanology and Geothermal Research, 421, 107413. (doi: 10.1016/j.jvolgeores.2021.107413)

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The Sierra Nevada Volcanic Range (SNVR), which includes Popocatépetl, Iztaccíhuatl and Tláloc-Telapón volcanoes, has been the source of multiple large explosive eruptions that have dispersed tephra across central México. Several eruptions since 40 ka have previously been described, particularly from Popocatépetl, the southernmost volcano of the range. However, the longer-term eruption history of the SNVR is poorly understood, due to challenges with correlating limited exposures of older pyroclastic sequences, and in discriminating between tephras derived from different sources. Here we describe two extensive exposures located between Popocatépetl and Iztaccíhuatl volcanoes, which provide a more complete and longer-term explosive eruption record of the SNVR: the Nepopualco and Xalitzintla tephra sequences. A detailed tephrostratigraphic survey, together with new 40Ar/39Ar geochronological analyses and glass geochemistry, has permitted the characterization of identified eruption units further leading to the determination of geochemical fields for each volcano and the subsequent discernment of volcanic sources. Our results show that, since the collapse of the Los Pies Cone, which destroyed the Paleo-Iztaccíhuatl edifice at 631 ± 44 ka (2σ), Iztaccíhuatl has produced at least 6 explosive rhyolitic eruptions. After coeval activity with Popocatépetl, between ~600 and ~500 ka, Iztaccíhuatl's explosive activity ceased while Popocatépetl's continued until present day. Popocatépetl has produced at least 27 medium to large explosive eruptions (inferred VEI 4–6), commonly of andesitic to dacitic compositions. Some of these eruptions deposited pumice fallout of >1 m thick in both the Nepopualco and Xalitzintla sequences (e.g. the 339 ± 16 ka [2σ] NT-23/WRT-7 eruption), suggesting that Popocatépetl has produced several eruptions similar in magnitude to the well-known ~14 ka Tutti Frutti Pumice (a VEI 6 eruption with a ~5 km3 tephra volume). The Popocatépetl and Iztaccíhuatl tephras are interbedded with deposits from more distal volcanoes, including some mafic to intermediate products of unknown sources (possibly from nearby monogenetic cones) and tephras related to the late Pleistocene eruptions of Tláloc-Telapón (including the tephra layer produced by the San Valentin Ignimbrite, recently 40Ar/39Ar dated in this study at ~102 ka; 2σ). Our new chemical, stratigraphic and geochronologic investigations of these pyroclastic deposits, predominantly from Popocatépetl and Iztaccíhuatl, provide information on the scale and frequency of medium to large magnitude explosive eruptions over a longer-time period than currently known and that have had potential to disperse tephra across central México since the middle to late Pleistocene. This new data can be used to determine the source of further unknown tephras in the region as well as to better assess the volcanic hazard to the densely populated megalopolis of México City.

Item Type:Articles
Additional Information:ISP and this study were funded by the Natural Environment Research Council (NERC), UK (NE/S009035 awarded to VCS, SFLW, MB and DFM). AGEH was funded by a NERC PhD studentship awarded through the Central England NERC Training Alliance (CENTA; grant reference NE/L002493/1). We acknowledge fieldwork logistic support from the National Autonomous University of Mexico (UNAM) and the field assistance of undergraduate students from the Institute of Geology, UNAM, including Miguel Meza, Jesús Morales and Kai Melo. Field support was also provided by Ainhoa Lorenzo. ISP acknowledge also to the MSCA Individual Fellowship (European Commission Grant No. 101024337), which was funding him while working on this manuscript during the last few months.
Glasgow Author(s) Enlighten ID:Mark, Professor Darren and Barfod, Dr Dan and Dymock, Mr Ross
Creator Roles:
Barfod, D.Investigation, Methodology, Resources, Formal analysis, Validation, Visualization, Writing – review and editing
Mark, D.Funding acquisition, Methodology, Resources, Project administration, Validation, Visualization, Writing – review and editing
Dymock, R.Methodology, Validation, Visualization, Formal analysis, Writing – review and editing
Authors: Sunyé-Puchol, I., Hodgetts, A. G.E., Watt, S. F.L., Arce, J. L., Barfod, D. N., Mark, D. F., Sosa-Ceballos, G., Siebe, C., Dymock, R. C., Blaauw, M., and Smith, V. C.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Journal of Volcanology and Geothermal Research
ISSN (Online):1872-6097
Published Online:26 October 2021

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