Publication Date:
2022-12-14
Description:
New constraints were set on the age of marine deposits in the Pontine Plain and of the related sea level
indicators on the Tyrrhenian Sea coast of central Italy by twelve new 40Ar/39Ar dates on detrital sanidine
from these deposits. By combining a new geomorphologic analysis and previous morpho-pedostratigraphic
studies with these geochronological constraints we reconstructed the geometry of four
marine terraces and correlated these with the highstands during the marine isotopic stages (MIS) 9.3, 7.5,
5.5 and 5.3.
Results point to a progressive tilting of the terraces, the elevation increasing from the SE to the NW due
to differential tectonic uplift that occurred over the last 300 ka. We identified a MIS 9 sea level at 30 -
25 m asl in the northwestern sector, whereas the MIS 7.5 sea level reached a maximum of 24 m asl in the
NWand descended to 18 m asl in the central sector. Moderate tilting affected the MIS 5.5 sea level, with
an elevation of 12 to 9.5 m asl in between the Anzio and Circeo headlands. Finally, an undeformed MIS
5.3 sea level at ca. 3 m asl is indicated throughout this coastal reach, confirming previous data suggesting
a much higher absolute sea level during this highstand with respect to the d18O-derived predicted level.
Description:
Published
Description:
107866
Description:
2T. Deformazione crostale attiva
Description:
JCR Journal
Keywords:
Marine terraces
;
MIS 5 sea level
;
Pontine Plain
;
Tyrrhenian Sea
;
04.04. Geology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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