Publication Date:
2021-05-17
Description:
Biostratigraphy based on calcareous nannofossils, integrated by magnetostratigraphic, geochronological
and isotopic data, allowed establishing a precise chronological framework for the Pleistocene succession
within the south-western sector of the Crotone Basin (Calabria, Southern Italy), where the Pliocenee
Pleistocene global stratotype section and point is defined, thus demonstrating that sedimentation was
quasi-continuous during most of the Lower and Middle Pleistocene.
At a large scale, the Pleistocene succession in this sector of the Crotone Basin is characterized by an
evident shallowing-upwards trend, showing facies changes from bathyal to shelfal to littoral/continental.
However, comparison between adjacent sectors within the investigated area demonstrates that stratigraphic
architectures change vastly on very short distances. Our chronological constraints indicate that
such changes in sedimentation styles probably occurred in response to differential subsidence rates,
which originated tectonically-controlled synsedimentary structures where accommodation space and
sediment yield were allotted unevenly. This articulated physiography led to striking differences in the
overall thicknesses and organization of Pleistocene stratigraphies and, eventually, to a distinct diachroneity
in the first appearance of shallow-marine deposits. In addition, superimposed are complex
interplays between regional and local tectonics, eustasy and orbitally-forced climate changes. These
interactions have been highlighted by the oxygen isotope stratigraphy established for a part of the
studied succession, which is likely to document almost continuously the interval from Marine Isotope
Stage (MIS) 26 to MIS 17. In its younger part (post-MIS 17), chronological ties are poor, as the succession
is dominated by shallow-water to continental deposits showing a prominent organization into cyclothems.
Nevertheless, based on the chronology of the underlying units, it is feasible that basin infill ended
during MIS 15-MIS 14 times.
Description:
Published
Description:
1185-1200
Description:
2.2. Laboratorio di paleomagnetismo
Description:
JCR Journal
Description:
restricted
Keywords:
Pleistocene
;
Chronostratigraphy
;
Southern Italy
;
04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transport
;
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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