⚠️⚠️ Exceptionnellement un jeudi - Exceptionally on a Thursday ⚠️⚠️ Salle PK-6610 - Room PK-6610 ⚠️⚠️
Séminaire du Geotop / Geotop seminar
Événement hybride / Hybrid event:
En personne/In person:
LOCAL/ROOM PK-6610
201 ave. du Président-Kennedy, Montréal, QC
Zoom ID: 832 1632 7466
Passcode: isotope
Prof. Hugh Tuffen, Chair in Volcanology, Lancaster University, UK
"Rethinking the explosive-effusive transition in silicic eruptions"
According to established thinking, a volcanic eruption may be either explosive or effusive in style, with initially violent activity generally giving way to gentler emplacement of lava. However, recent observations of a number of silicic eruptions, most notably Chilean rhyolites (Fig. 1), have challenged this framing, with the realisation that explosive pyroclastic venting may accompany much or all of the supposedly effusive phase. This demands reappraisal of the nature of explosive and effusive activity [1], and the controlling conduit processes.
In this presentation we will overview evidence for this mixed (hybrid) eruption style, examine the geological signature of hybrid activity in pyroclastic deposits, lava flows [2], and dissected conduits [3], and appraise the implications for volcanic hazard assessment and volcanic outgassing.
References
[1] Wadsworth, F.B. et al., 2020 DOI: 10.1126/sciadv.aba79
[2] Unwin, H., et al., 2023 DOI: 10.1007/s00445-023-01638-z
[3] Farquharson, J.I., et al., 2022 DOI : 10.1038/s41467-022-32522-7
You may also like the following events from Geotop:
- Next Tuesday, 18th November, 12:30 pm, The Accretion History of Earth in Montreal
- This month, 26th November, 12:30 pm, Le projet CARBONIQUE : bilan des 18 premiers mois in Montreal
- Next month, 3rd December, 12:30 pm, Devenir Maya: Production de l'identité dans la petite enfance, site archéologique Ucanal, Guatemala in Montreal
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