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GMPV3 The Mixing of Magmas from Melt Formation to Eruption
From: "Cristina P. De Campos" <campos@xxxxxxxxxxxxxxxxxxx>
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Dear Folks,
We would like to remind you that the deadline for abstract submission to the
session:
GMPV3
The Mixing of Magmas from Melt Formation to Eruption
session:
GMPV3
The Mixing of Magmas from Melt Formation to Eruption
During the General Assembly, for the EGU 2010 is next Monday, 01.17.2010.
Conveners: Diego Perugini and Cristina De Campos
Abstract Submission
http://meetingorganizer.copernicus.org/EGU2010/session/2655
http://meetingorganizer.copernicus.org/EGU2010/session/2655
Igneous processes generate compositional gradients at different length
scales. Examples include: i) interaction of magmas from variable sources
(e.g. mantle and crustal melts); ii) crystallization along walls of magma
chambers generating compositional gradients from the centre of the magmatic
mass to its peripheral portions; iii) differential assimilation of country
rocks in different regions of a magma body; iv) anatexis of heterogeneous
rock volumes producing compositional gradients due to different degrees of
partial melting. All these processes inevitably trigger mixing episodes and
characterize most evolutionary stages of a magmatic system. Furthermore, the
embedding geometry where the mixing process may occur (e.g. magma chamber,
fracture/channel networks, volcanic conduits) may strongly modulate the
fluid-dynamic style and process intensity.
scales. Examples include: i) interaction of magmas from variable sources
(e.g. mantle and crustal melts); ii) crystallization along walls of magma
chambers generating compositional gradients from the centre of the magmatic
mass to its peripheral portions; iii) differential assimilation of country
rocks in different regions of a magma body; iv) anatexis of heterogeneous
rock volumes producing compositional gradients due to different degrees of
partial melting. All these processes inevitably trigger mixing episodes and
characterize most evolutionary stages of a magmatic system. Furthermore, the
embedding geometry where the mixing process may occur (e.g. magma chamber,
fracture/channel networks, volcanic conduits) may strongly modulate the
fluid-dynamic style and process intensity.
Although increasing natural evidence indicates a major role of magma mixing
in igneous systems in all geological environments, several questions still
remain open. Among them: what is the smallest length-scale at which magma
mixing may generate compositional heterogeneities? What are the most
important factors that may promote or inhibit mixing processes? What is the
space-time span for generating compositional heterogeneities by magma
mixing? How do these heterogeneities may influence the composition of
crystallizing minerals and melt inclusions? What are the time scales for
hybrid melt production? How can we reconcile these features with classical
geochemical models in which both time and space are not taken into account?
The proposed session aims at an interdisciplinary discussion on these and
other magma mixing related questions, highlighting its relevance as a
petrologic and volcanological tool. Contributions documenting the occurrence
of magma mixing processes in both plutonic and volcanic environments are
welcome, as well as those focusing on experimental, theoretical and
numerical modeling.
We hope to see you in Vienna.
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