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The palaeogeographic setting and the local environmental impact of the 130 ka Falconiera tuff-cone eruption (Ustica island, Italy)
Language
English
Obiettivo Specifico
1V. Storia eruttiva
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/60 (2017)
Pages (printed)
S0224
Issued date
February 2017
Abstract
This research focuses on the effects of the last eruption at Ustica,
which formed the Falconiera tuff-cone at around 130 ka BP in the
north-eastern tip of the island. This eruption was mainly explosive
and phreatomagmatic, emplacing a series of pyroclastic surge beds
that formed an asymmetric tuff cone. This is the most easily recognizable
volcanic edifice on Ustica, although its north-eastern sector
has been partially eroded. A section of the feeding conduit is exposed
northward, and is composed of lavas that fed the last stages of the
eruption characterized by an intracrateric lava lake and a Strombolian
scoria-fallout deposit. The eruption occurred during Upper Pleistocene
Marine Isotopic Substage 5.5, a warm period characterized
by a high sea-level stand (6±3 m above the present sea level in stable
areas) and the diffusion of subtropical flora and fauna across the
Mediterranean sea. This eruption slightly modified the morphology
of Ustica, but impacted both marine and terrestrial environments,
burying beach deposits rich in mollusk shells (i.e. Strombus bubonius,
Conus testudinarius, Brachidontes puniceus), colonies of corals (Cladocora
caespitosa) and subaerial plants (Chamaerops humilis). These
organisms, found in some cases in their life position, along with other
lines of evidence, provide information on the palaeogeography of this
sector of the island at the time of the eruption and on the local impact
of this event on the environment.
which formed the Falconiera tuff-cone at around 130 ka BP in the
north-eastern tip of the island. This eruption was mainly explosive
and phreatomagmatic, emplacing a series of pyroclastic surge beds
that formed an asymmetric tuff cone. This is the most easily recognizable
volcanic edifice on Ustica, although its north-eastern sector
has been partially eroded. A section of the feeding conduit is exposed
northward, and is composed of lavas that fed the last stages of the
eruption characterized by an intracrateric lava lake and a Strombolian
scoria-fallout deposit. The eruption occurred during Upper Pleistocene
Marine Isotopic Substage 5.5, a warm period characterized
by a high sea-level stand (6±3 m above the present sea level in stable
areas) and the diffusion of subtropical flora and fauna across the
Mediterranean sea. This eruption slightly modified the morphology
of Ustica, but impacted both marine and terrestrial environments,
burying beach deposits rich in mollusk shells (i.e. Strombus bubonius,
Conus testudinarius, Brachidontes puniceus), colonies of corals (Cladocora
caespitosa) and subaerial plants (Chamaerops humilis). These
organisms, found in some cases in their life position, along with other
lines of evidence, provide information on the palaeogeography of this
sector of the island at the time of the eruption and on the local impact
of this event on the environment.
Type
article
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