Publication Date:
2022-06-10
Description:
The San Bartolomeo Formation was established by
CROSTELLA & VEZZAN(I1 964), and consists of about 1000 m
thick siliciclastic and turbiditic sedimentary succession, which
lies in angular unconformity over the Sannio Unit (PATACCA&
SCANDONE, 2007).
As far as the age, this formation has been controversially
considered Serravallian -Tortonian (CROSTELLA & VEZZANI,
1964), Serravallian (TORTORICI1, 975), Langhian - Tortonian
(PESCATORE, 1971; DAZZARO et alii, 1988), latemost
Tortonian?/early Messinian (PATACCA & SCANDONE, 2007).
Moreover the tectono-sedimentary environment of these deposits
is also questionable considered: foredeep basin (Cocco el alii,
1972), piggy-back basin (Dazzaro et alii, 1988; Dl NOCERA el
alii, 1988; PATACCAet alii, 1990), thrust- related basin (BOLANO,
2000), thrust-top or wedge -top basin (PESCATOReEt alii,1996;
PESCATOREet alii, 2000) and thrust -sheet-top basin (PATACCA
& SCANDONE, 2007').
The deposits of San Bartolomeo Formation widely outcrop in
the center-eastem part of the geological map N. 405,
Campobasso, of the National Geological Map Series of Italy (at
scale 1:50,000). In this area the studied formation consists of a
succession, about 600 m thick, of siliciclastic and turbiditic
sediments composed by three main lithofacies: a) arenaceous and
lor arenaceous-conglomerate; b) pelitic-arenaceous: and c)
pelitic.
The age of the investigated sediments was established on the
basis of integrated calcareous plankton hiostratigraphy
(calcareous nannofossils and planktonic foraminifera). A total of 164 samples were collected for biostratigraphic studies, with a sample resolution of 50 centimetres to 2 m, along seven stratigraphical sections, logged and measured between Casalciprano village, at North, and Baranello village at South.The analyses of calcareous nannofossil and planktonic
foraminifera1 assemblages were performed following the
procedures extensively used in Mediterranean and extra-
Meditexanean biostratigraphic studies (Dl STEFANO el alii, 2008,
and references therein), and the zonal assignment followed the
biostratigraphic schemes of SPROVIEReIt alii (2002) and DI
STEFANOet alii (2008).
Based on the integrated biostratigraphic study the San
Bartolomeo Formation, cropping out in Campobasso area,
encompasses the early Serravallian - middlellate? Tortonian
stratigraphic internal, between the calcareous nannofossil zones
MNN6a and MNNBlMNN9, and the planktonic foraminiferal
zones MMi5 through MMi 1 1.
The biostratigraphic results presented and the detailed field
observations carried out for mapping the Campobasso geological
map, would suggest a reassessment of the San Bartolomeo
Formation chronostratigraphy, the Sannio Unit paleogeographic
position, and the tectono-sedimentary evolution of the Southern
Apennines during the Serravallian age.
Description:
Unpublished
Description:
Pisa, Italy
Description:
2.2. Laboratorio di paleomagnetismo
Description:
restricted
Keywords:
Calcareous plankton biostratigraphy
;
Middle and Late Miocene
;
San Bartolomeo Formation
;
Souther Apennines
;
04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Oral presentation
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