Publication Date:
2017-04-04
Description:
A comprehensive volcanological study of
the Albano multiple maar (Alban Hills, Italy) using (i)
40Ar/39Ar geochronology of the most complete stratigraphic
section and other proximal and distal outcrops and
(ii) petrographic observations, phase analyses of major
and trace elements, and Sr and O isotopic analyses of the
pyroclastic deposits shows that volcanic activity at Albano was strongly discontinuous, with a first eruptive cycle at
69±1 ka producing at least two eruptions, and a second
cycle with two peaks at 39±1 and 36±1 ka producing at
least four eruptions. Contrary to previous studies, we did
not find evidence of magmatic or hydromagmatic eruptions
younger than 36±1 ka. The activity of Albano was fed by
a new batch of primary magma compositionally different
from that of the older activity of the Alban Hills; moreover,
the REE and 87Sr/86Sr data indicate that the Albano magma
originated from an enriched metasomatized mantle. According
to the modeled liquid line of descent, this magma
differentiated under the influence of magma/limestone
wall rock interaction. Our detailed eruptive and petrologic
reconstruction of the Albano Maar evolution substantiates
the dormant state of the Alban Hills Volcanic District.
Description:
Published
Description:
567-591
Description:
JCR Journal
Description:
reserved
Keywords:
Eruptive cycles
;
Geochronology
;
Alban Hills
;
Maar
;
Ultrapotassic
;
Hydromagmatic
;
Decarbonation
;
04. Solid Earth::04.08. Volcanology::04.08.03. Magmas
;
04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
;
05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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