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SUMMARY:Priming patterns of volcanic eruptions revealed by deep-time diffu
 sion chronometry - Martin Mangler\, Durham University
DTSTART:20220224T150000Z
DTEND:20220224T160000Z
UID:TALK168323@talks.cam.ac.uk
CONTACT:Oscar Branson
DESCRIPTION: Diffusion chronometry has become increasingly popular in the 
 (igneous) petrologic community over the past two decades as it offers cost
 -effective yet powerful insight into pre-eruptive magma dynamics and times
 cales. Any element in any compositionally zoned mineral can be modelled if
  the respective diffusion rate and magmatic conditions (e.g.\, temperature
 ) are known\; extracted timescales are commonly used to constrain mixing-t
 o-eruption timescales and ascent rates. However\, the vast majority of dif
 fusion models only consider the outermost crystal rims as long-term magmat
 ic conditions relevant to crystal interiors are much harder to reconstruct
 . Here\, I present two approaches to diffusion chronometry that allow us t
 o dive deeper into the crystal record and reconstruct magmatic processes b
 eyond the final stages prior to eruption. We will explore how every crysta
 l’s journey towards the surface is different\, lasting days to millennia
 \; we will reconstruct how frequent magma recharge into the shallow crust 
 may (or may not) prime a volcano for eruption\; and we will fathom whether
  such long-term injection patterns and durations control eruption magnitud
 e and style. This work highlights the largely untapped potential of diffus
 ion chronometry\, and similar studies for volcanoes in different tectonic 
 settings will be crucial to further illuminate deep-seated controls on vol
 canic activity.
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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