Academic Journal
Integrated constraints on explosive eruption intensification at Santiaguito dome complex, Guatemala
| العنوان: | Integrated constraints on explosive eruption intensification at Santiaguito dome complex, Guatemala |
|---|---|
| المؤلفون: | Wallace, Paul A., Lamb, Oliver D., De Angelis, Silvio, Kendrick, Jackie E., Hornby, Adrian J., Díaz-Moreno, Alejandro, González, Pablo J., von Aulock, Felix W., Lamur, Anthony, Utley, James E.P., Rietbrock, Andreas, Chigna, Gustavo, Lavallée, Yan |
| المساهمون: | Natural Environment Research Council (UK), European Research Council, European Commission |
| بيانات النشر: | Elsevier BV |
| سنة النشر: | 2020 |
| المجموعة: | Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| مصطلحات موضوعية: | Effusive-explosive transitions, Microlites, Magma ascent, Volcanic ash, Santiaguito, Seismicity |
| الوصف: | Protracted volcanic eruptions may exhibit unanticipated intensifications in explosive behaviour and attendant hazards. Santiaguito dome complex, Guatemala, has been characterised by century-long effusion interspersed with frequent, small-to-moderate (<2 km high plumes) gas-and-ash explosions. During 2015–2016, explosions intensified generating hazardous ash-rich plumes (up to 7 km high) and pyroclastic flows. Here, we integrate petrological, geochemical and geophysical evidence to evaluate the causes of explosion intensification. Seismic and infrasound signals reveal progressively longer repose intervals between explosions and deeper fragmentation levels as the seismic energy of these events increased by up to four orders of magnitude. Evidence from geothermobarometry, bulk geochemistry and groundmass microlite textures reveal that the onset of large explosions was concordant with a relatively fast ascent of a deeper-sourced (∼17–24 km), higher temperature (∼960–1020 °C) and relatively volatile-rich magma compared to the previous erupted lavas, which stalled at ∼2 km depth and mingled with the left-over mush that resided beneath the pre-2015 lava dome. We interpret that purging driven by the injection of this deep-sourced magma disrupted the long-term activity, driving a transition from low energy shallow shear-driven fragmentation, to high energy deeper overpressure-driven fragmentation that excavated significant portions of the conduit and intensified local volcanic hazards. Our findings demonstrate the value of multi-parametric approaches for understanding volcanic processes and the triggers for enigmatic shifts in eruption style, with the detection of vicissitudes in both monitoring signals and petrological signatures of the eruptive products proving paramount. ; his work was supported by the European Research Council Starting Grant on Strain Localisation in Magma (SLiM, 306488). SDA, YL, and AR acknowledge funding from the Natural Environment Research Council (Grant NE/P007708/1). JEK acknowledges an ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0012-821X |
| Relation: | #PLACEHOLDER_PARENT_METADATA_VALUE#; info:eu-repo/grantAgreement/EC/H2020/306488; info:eu-repo/grantAgreement/EC/H2020/753900; Postprint; https://doi.org/10.1016/j.epsl.2020.116139; Sí; Earth and Planetary Science Letters 536: 116139 (2020); http://hdl.handle.net/10261/204805; http://dx.doi.org/10.13039/501100000780; http://dx.doi.org/10.13039/501100000781; http://dx.doi.org/10.13039/501100000270 |
| DOI: | 10.1016/j.epsl.2020.116139 |
| DOI: | 10.13039/501100000780 |
| DOI: | 10.13039/501100000781 |
| DOI: | 10.13039/501100000270 |
| الاتاحة: | http://hdl.handle.net/10261/204805 https://doi.org/10.1016/j.epsl.2020.116139 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100000781 https://doi.org/10.13039/501100000270 |
| Rights: | open |
| رقم الانضمام: | edsbas.6FAB2FB5 |
| قاعدة البيانات: | BASE |
| تدمد: | 0012821X |
|---|---|
| DOI: | 10.1016/j.epsl.2020.116139 |