Abstract

The area represented in the F° 438 “Bari”, at the scale 1:50.000, lies in the northern part of the Murge (Apulia region, southern Italy). The Murge is part of the Apulian Foreland, which represents the south-Apennines foreland made up of a uniform crustal structure with a Variscan crystalline basement and an approximately 6 km thick Mesozoic sedimentary cover overlain by relatively thin and discontinuous Tertiary and Quaternary deposits. The Mesozoic deposits extensively cropping out in the F° 438 “Bari” are represented by the Calcare di Bari Fm, showing in this area a thickness of 470 m. The lower and the upper boundaries of this formation do not crop out in the studied area. Mostly, the Calcare di Bari succession is made up of biopeloidal and peloidal wackestones/packstones alternated to stromatolitic bindstones with frequent intercalations of dolomitic limestones and grey dolostones. Mollusksrich layers (mostly rudist shells) with fl oatstone/rudstone texture occur in the lower and upper parts of the successions. These layers are easily recognizable in the fi eld and form up to some tens of meters thick strata sets. These strata sets were formerly used as reference layers (“livelli guida”) for lithostratigraphic correlations. They correspond to “livello Palese”, “livello Sannicandro” and “livello Toritto”, already recognized in the previous edition of Carta Geologica d’Italia. Furthermore, in the middle part of the succession, 20 thick dolomitic breccias alternate to massive dolostones laterally fading (towards east) in peritidal limestones. Due to these peculiar lithologic features, this lithofacies has been distinguished and mapped (lithofacies CBAa). The upper part of the succession is made up of fl oatstones/rudstones alternated to intrabioclastc rudstones and burrowed mudstones/wackestones. Most of the Calcare di Bari succession shows facies features related to peritidal environments; only the features of upper part suggest relatively more distal and deeper environments belonging to an external platform setting. The Calcare di Bari succession bears macro-(mollusks) and microfossils (benthic foraminifers), and the biostratigraphic data allowed us to refer the age of the whole succession of the Calcare di Bari Fm to the early Albian p.p.-late Cenomanian. The lower Pleistocene Calcarenite di Gravina Fm unconformably lies on the Calcare di Bari Fm. The lower boundary is transgressive and is locally marked by reddish residual deposits (terra rossa) and/or by brackish silty deposits passing upward to shallow-water calcarenites rich in bioclasts. Mainly this formation is made up of litho-bioclastic calcarenites and calcirudites with packstone/ grainstone texture, rich in mollusks, red algae, serpulids, echinoids and benthic foraminifers. The thickness of this unit ranges from few metres to 20 m, and its depositional environments are related to alluvial or offshore systems. The age is early Pleistocene (Gelasian ?-Calabrian). The argille subappenine fm conformably lies on the Calcarenite di Gravina Fm, and crops out only in a very restricted area in the southeastern corner of the sheet. The argille subappenine fm is made up of burrowed silty clays interbedded to dark grey marly clays, silts and fi ne-grained sand. The outcropping thickness is about 2 m, but by drilling data it appears at least 8 m. Frequently, mollusks, bryozoans and serpulids fragments are present; micropaleontological content is represented mainly by benthic foraminifers ad rarely by planctonic foraminifers and nannofossil. The facies features are related to offshore environments. The age is early Pleistocene (Calabrian). The Murge supersynthem groups all the marine terraced deposits unconformably lying on all older units and consists of a heterogeneous assemblage of mixed silicoclastic and carbonate sediments formed in shallow-marine and transitional environ

Autore Pugliese

• Sabato Luisa , Tropeano Marcello , Marino Maria

Tutti gli autori

• SABATO L.;TROPEANO M.;MARINO M.

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2011

ISSN

0391-2027

ISBN

9788824029902

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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