Publication Date:
2017-04-04
Description:
The Apennines belt of Italy undergoes a northeast-trending extension at a rate of a few
millimeters per year that generates moderate to large normal-faulting earthquakes. In this
paper, we show that seismicity, large earthquakes, strong gas emission, and belt topography
all correlate with a broad, low Vp anomaly in the uppermost mantle. We propose that
a thermal/fl uid anomaly in the mantle, associated with sub-lithospheric mantle replacement
after delamination of the Adria lithosphere, supports the topography of the belt and
drives the extensional tectonics. The mantle anomaly is likely caused by deep fl uids coming
from the dehydration of the material subducted during the Europe-Adria collision and the
delamination of Adria. Beneath the belt, CO2-rich fl uids are accumulated and occasionally
discharged during large normal faulting earthquakes. After the replacement of sub-lithospheric
mantle, the temperature at the base of the crust increases causing crustal stretching,
anatexis, and strong degassing.
Description:
Published
Description:
715-718
Description:
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Description:
2.4. TTC - Laboratori di geochimica dei fluidi
Description:
4.5. Studi sul degassamento naturale e sui gas petroliferi
Description:
JCR Journal
Description:
restricted
Keywords:
mantle anomaly
;
Continental delamination
;
the Apennines
;
03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring
;
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
;
04. Solid Earth::04.08. Volcanology::04.08.01. Gases
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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