Publication Date:
2021-06-07
Description:
We present a high-resolution palaeomagnetic and rock magnetic study of two cores, MS06
and MS06-SW (6.7 and 1.1 m long, respectively), collected at 72 m below sea level in the
Augusta Bay shelf (Eastern Sicily, Ionian Sea, Italy) about 2.3 kmfrom the coastline. Geophysical
surveying carried out in the sampling area highlighted the presence of a homogeneous
sedimentary sequence that most likely was deposited after the Last Glacial Maximum and
was not affected by anthropogenic disturbances. The two cores penetrated a monotonous mud
sedimentary sequence, interrupted at ∼3 m depth by a 3–4-cm-thick volcanic sandy layer that
is correlated with the tephra fallout deposit produced by the 122 BC plinian eruption of Mt
Etna. This tephra, along with radiocarbon dating of nine marine shells and with radioactive
tracers for the uppermost 0.3 m (210Pb and 137Cs), provide the chronological constraints for
the stratigraphic sequence that resulted younger than 4500 yr BP.
Palaeomagnetic and rock magnetic data show that the sample sequence is magnetically homogeneous.
A single peak of high magnetic mineral concentration is present and corresponds
to the volcanic sandy layer. Palaeomagnetic data allowed the identification of a well-defined
characteristic remanent magnetization that provides a high-resolution record of palaeosecular
variation (PSV) at the sampling site. The reconstructed PSV curve is in good agreement with
the available regional reference PSV curves and with the prediction from recent PSV modelling
for Europe. The palaeomagnetic data obtained in this study on the one hand support
and refine the age model for the cores, derived from other independent constraints, and on the
other hand provide an original high-resolution PSV curve that can serve as a reference for the
central Mediterranean over the last 4 ka.
Description:
Published
Description:
191 - 202
Description:
2.2. Laboratorio di paleomagnetismo
Description:
JCR Journal
Description:
restricted
Keywords:
Palaeointensity
;
Palaeomagnetic secular variation
;
Marine magnetics and palaeomagnetics
;
Europe
;
04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
;
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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