Publication Date:
2024-05-29
Description:
We developed a high-resolution magnetochronology of the Pleistocene stratigraphy of the Monte Netto hillock, a tectonically uplifted struc ture in the Po Plain of northern Italy. Our data allowed reconstructing the depositional age of the sequence and assessing rates of defor mation and rock uplift of the neotectonic structure, thus providing constraints on the tectono-sedimentary evolution of this seismically
active part of the buried Southern Alps. Using a combination of magnetostratigraphy and paleosecular variation analysis, we generated
an age-depth model for the Monte Netto stratigraphy that encompasses, from the top, Upper Pleistocene (11–72 ka) loess-paleosols over laying fluvial sediments spanning the Brunhes-Matuyama boundary (773 ka) and the top of the Jaramillo (990 ka). The identification of the
same magneto-chronostratigraphic surfaces in nearby drill cores from regions of the Po Plain that have not been affected by neotectonic
deformation allowed estimating a mean rate of tectonic uplift of the hillock relative to the neighboring plain of 11.3 ± 1.5 cm/ka, and
an absolute uplift relative to sea level of ∼19.3 cm/ka. Finally, our paleomagnetic analyses from the uppermost loess sequence disclosed
the complexity of the tectonic evolution of the Monte Netto structure, which shows evidence of a two-phase rotational deformation linked
to coseismic surface faulting due to recent seismic activity.
Description:
Published
Description:
191-205
Description:
JCR Journal
Keywords:
Magnetochronology
;
Pleistocene
;
Paleosecular variations
;
Loess-paleosols
;
Neotectonic deformation
;
Po Plain
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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