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 Wednesday, May 25(16:30-18:30
CEST) with
Massimo Pompilio,
*INGV Pisa, Italy:
*
“Petrological monitoring of active volcanoes and diffusion chronometry:
a close relationship for a mutual benefit”
*
*
and
Euan Mutch,
*Lamont-Doherty Earth Observatory, USA:
*
“The dichotomous nature of Mg-in-plagioclase partitioning: Implications
for diffusion chronometry”
*
*
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Summary:
*
*
*/“Petrological monitoring of active volcanoes and diffusion
chronometry: a close relationship for a mutual benefit”/
*
/
/
/One of the main potentials of the diffusion chronology is that it
allows correlations between timescales of magmatic processes inferred
from petrologic data and real-time monitoring signals. However, to do
this, these techniques need of samples well constrained under the point
of view of the time. One of the tasks of the petrological monitoring is
to collect and to investigate samples among which the time relationships
are known unequivocally./
/In this talk, we present a brief description of the state of the art
for petrological monitoring resulting from a recent survey conducted in
the framework of the EUROVOLC project. The survey involved eighteen
monitoring institutions that include volcano observatories, academia and
research laboratories. These institutions monitor volcanoes with a large
spectrum of magma composition and eruptive styles, and thus they can be
considered representative of the multifaceted petrological monitoring
performed worldwide./
/After an initial historical perspective, that describes origins,
development of these activities over time and some well-known
case-histories, we will focus on how petrological monitoring is
performed by the different institutions and what participants consider
as the major problems. Then we scrutinize the survey results selecting
analyses that are fast and easy to acquire (in terms of resources,
equipment, and time availability) and provide relevant results in terms
of knowledge on the magmatic system and on the eruptive behavior. On
this basis we identify the best analytical practices for an efficient
petrological monitoring and we propose possible future developments,
among which the diffusive chronology plays a key-role./
Talk based on:
Re, G., Corsaro, R. A., D’Oriano, C., & Pompilio, M. (2021).
Petrological monitoring of active volcanoes: A review of existing
procedures to achieve best practices and operative protocols during
eruptions. Journal of Volcanology and Geothermal Research, 419, 107365.
https://doi.org/10.1016/j.jvolgeores.2021.107365
/
/
*/“The dichotomous nature of Mg-in-plagioclase partitioning:
Implications for diffusion chronometry”/
*
/
/
/Modelling diffusion of Mg in plagioclase is commonly used to estimate
the timescales of magmatic processes that operate weeks to decades
before eruption. This, however, requires knowledge of how the anorthite
composition influences partitioning of Mg. We find that this
partitioning relationship depends on the structural state of
plagioclase, which in turn controls the shape of Mg diffusion profiles.
The meaning of Mg compositional profiles may need to be reinterpreted,
which may be important for using plagioclase zoning in order to
understand thermal states and magmatic histories at a range of tectonic
settings./
/
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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/u5EkdeytqDIjHNFLJdDlOSRaE3EFT17fBgSn-
all registrants will receive a link to the seminar that is valid for
that person only. A seperate 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