A seminar series on diffusion modelling to determine timescales of processes (Diffusion Chronometry)
A seminar series on diffusion modelling to determine timescales of
processes (Diffusion Chronometry)
Dear Colleagues,
Our next seminar will be held on Thursday, October 28(16:30-18:30
CEST) with
Chiara Maria Petrone,
The Natural History Museum, London, UK:
“Reconstructing magma dynamics via elemental diffusion chronostratigraphy”
and
Christy Till & Adam Kent,
Arizona State University & Oregon State University, USA:
“Start me up: The relationship between volcanic eruption
characteristics and eruption initiation mechanisms”
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Summary:
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/“Reconstructing magma dynamics via elemental diffusion
chronostratigraphy”/
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/Time-related information of pre-eruptive magmatic processes is locked
in the chemical profile of compositionally zoned minerals and can be
retrieved by means of elemental diffusion chronometry. However, only the
timescale of the outermost rim is commonly resolved, limiting our
knowledge of timescales to those directly preceding the eruption. Recent
advances in geospeedometry allow to retrieve information from the entire
core to rim compositional profile of single crystals providing a
complete chronostratigraphy of the recorded pre-eruptive processes.
Elemental diffusion chronostratigraphy can be fully resolved for
crystals that have spent their lifetime in hot storage. Under this
condition, crystals will be kept at the temperature(s) of the eruptible
magma(s), and diffusion timescales approximate the storage of the
crystal in question in different melt environments allowing an in-depth
knowledge of the magmatic system far beyond late-stage pre-eruptive
processes.
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/Fe-Mg interdiffusion in pyroxenes from active volcanoes are used to
reconstruct the time-dependent elemental diffusion chronostratigraphies
of single crystals and to discuss their implication on magma dynamics
and the consequences on eruption style and magnitude. Combining
elemental diffusion chronostratigraphy with monitoring data and other
petrological, geological, and geophysical constraints at active
volcanoes can greatly enhance our capability to inform volcanic hazard
assessments.
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/“Start me up: The relationship between volcanic eruption
characteristics and eruption initiation mechanisms”/
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//There is a growing need for understanding the relationship between
volcano monitoring - which seeks to mitigate this hazard - and the
magmatic processes occurring at depth that initiate volcanic eruptions.
Here we use a new literature data compilation and statistical analysis
to show that there are significant differences in the composition,
volume, style and timescales between eruptions initiated by different
mechanisms. Knowledge of the processes that initiate eruptions at a
given volcano may thus have significant predictive power.//
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Registration is required to avoid undesired interruptions. Please
register by clicking the following link:
https://ruhr-uni-bochum.zoom.us/meeting/register/u5Mqc-qpqjMqHNc1MtY7G3irXN5qk98SY_tL-
all registrants will receive a link to the seminar that is valid for
that person only.
Note: A separate registration is required for every seminar.
A recording of each seminar is available via the following link:
https://diffchron.ruhr-uni-bochum.de/seminars/
M.Sc. Linda Sobolewski
Research Coordinator Research Unit 2881
Ruhr-Universität Bochum
Institut für Geologie, Mineralogie und Geophysik
Universitaetsstrasse 150
44780 Bochum
Germany