Publication Date:
2023-01-27
Description:
One of the major objectives of volcanology
remains relating variations in surface monitoring signals to
the magmatic processes at depth that cause these variations.
We present a method that enables compositional and temporal information stored in zoning of minerals (olivine in
this case) to be linked to observations of real-time
degassing data. The integrated record may reveal details
of the dynamics of gradual evolution of a plumbing
system during eruption. We illustrate our approach using the
2006 summit eruptive episodes of Mt. Etna. We find that the
history tracked by olivine crystals, and hence, most likely
the magma pathways within the shallow plumbing system of
Mt. Etna, differed considerably between the July and
October eruptions. The compositional and temporal record
preserved in the olivine zoning patterns reveal two mafic
recharge events within months of each other (June and
September 2006), and each of these magma supplies may have
triggered the initiation of different eruptive cycles (July 14–24
and August 31–December 14). Correlation of these observations with gas monitoring data shows that the systematic rise of
the CO2/SO2gas values is associated with the gradual (preand syn-eruptive) supply of batches of gas-rich mafic magma
into segments of Etna’s shallow plumbing system, where mixing with pre-existing and more evolved magma occurred.
Description:
This work was funded by the
German Science Foundation as part of the collaborative research centre
(SFB) on Rheology of the Crust—from the upper crust to the subduction
zone (SFB 526).
Description:
Published
Description:
692
Description:
2V. Dinamiche di unrest e scenari pre-eruttivi
Description:
3V. Dinamiche e scenari eruttivi
Description:
5V. Sorveglianza vulcanica ed emergenze
Description:
JCR Journal
Description:
restricted
Keywords:
Crystal zoning
;
Plumbing system Mt. Etna
;
Magma mixing
;
Gas monitoring
;
04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology
;
04. Solid Earth::04.04. Geology::04.04.07. Rock geochemistry
;
04. Solid Earth::04.08. Volcanology::04.08.01. Gases
;
04. Solid Earth::04.08. Volcanology::04.08.03. Magmas
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
05. General::05.02. Data dissemination::05.02.01. Geochemical data
;
05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
;
05. General::05.09. Miscellaneous::05.09.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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