Publication Date:
2017-04-04
Description:
A thermal modeling of the Vesuvius is presented,
based on its magmatic and volcanic history. A 2D numerical
scheme has been developed to evaluate the heat transfer
inside and around a magma body, the latent heat of
crystallization and the inputs of magma from the
asthenosphere to a crustal reservoir. Assuming a ratio 〉1
between velocities of magma ascending in the conduit and
magma laterally displaced in the reservoir, the results
indicate that, after 40 ka, the reservoir is vertically thermally
zoned. As a consequence it hosts magma batches that can
individually differentiate, mix and be contaminated by the
crust, and produce the spectrum of isotopic compositions of
the Vesuvian products. The thermal model reproduces the
geothermal gradient and the brittle-ductile transition (250–
300 C) at 6 km of depth (the maximum depth of earthquake
foci) only after 0.5–1 Ma, implying a long lived magma
chamber below the volcano.
Description:
Published
Description:
L17302
Description:
reserved
Keywords:
NONE
;
04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes
;
04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology
;
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Format:
244766 bytes
Format:
application/pdf
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