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GEOREF RECORD

New lithostratigraphic and biostratigraphic data on Scaglia Toscana in southern Tuscany (Rapolano Hot Springs area)

Anna Maria Bambini, Andrea Brogi, Gianluca Cornamusini, Armando Constantini and Antonio Lazzarotto
Nuovi dati lithostrtigrafici e biostratigrafici sulla Scaglia Toscana nella Toscana meridonale (area di Rapolano Terme)
Bollettino della Societa Geologica Italiana (October 2009) 128 (3): 669-693

Abstract

The Scaglia Toscana represents a stratigraphic unit belonging to the Tuscan Domain of the Northern Apennines. Such a stratigraphic unit results lithologically heterogeneous, and is representative of a very long time span (from the Early Cretaceous to the Oligocene) during which very important geological events took place, such as the convergence and collisional events giving rise to the edification of the Northern Apennines orogene. We have studied several key outcrops of the Scaglia Toscana exposed in the Rapolano Terme area (Southern Tuscany, Northern Apennines) in order to contribute to the reconstruction of the depositional setting and palaeo-geographical features of a sector of the Tuscan Domain from the Cretaceous to the Early Miocene, and to hypothesise a possible geodynamic evolution. The Scaglia Toscana exposed in the Rapolano Terme area has been deeply investigated through lithostragraphic and biostratigraphic analyses mainly carried out in three key areas indicated in the fig. 1: 1) the Podere Cetinaia-Podere Monte Petroso section; 2) the Podere Le Rossole section; and 3) the Modanella-Podere Campo d'Aia section. From the top (represented by the overlying Macigno Fm) to the bottom (Maiolica Fm) we have recognized three lithostratigraphic units: 1) Claystones and calcarenites (Argilliti e calcareniti di Dudda), containing lenses of nummulite bearing calcarenites and calcirudites ("Nummulitico", Calcareniti di Montegrossi). The thickness ranges from 50 to 100 m; Middle-Late Eocene. 2) Silty marls and claystones (Marne siltose ed argilliti marnose rosse di Podere Le Rossole) comparable for the age and stratigraphic position with the Marne del Sugame described in the Chianti Mts. The thickness does not exceed 10 m; Early-Middle Eocene. 3) Argilliti di Brolio consisting of three lithofacies: BRLa - manganesiferous radiolarites (thickness from 5 to 10 m); BRLb - siliceous siltstones (thickness of about 10 m); BRLc - red marly clays (thickness from 6 to 8 m); Albian-Turonian.


ISSN: 0037-8763
Coden: BOGIAT
Serial Title: Bollettino della Societa Geologica Italiana
Serial Volume: 128
Serial Issue: 3
Title: Nuovi dati lithostrtigrafici e biostratigrafici sulla Scaglia Toscana nella Toscana meridonale (area di Rapolano Terme)
Translated Title: New lithostratigraphic and biostratigraphic data on Scaglia Toscana in southern Tuscany (Rapolano Hot Springs area)
Affiliation: Universita di Siena, Diaprtimento di Scienze della Terra, Siena, Italy
Pages: 669-693
Published: 200910
Text Language: Italian
Summary Language: English
Publisher: Societa Geologica Italiana, Rome, Italy
References: 84
Accession Number: 2010-047777
Categories: StratigraphySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 5 plates, 2 tables, geol. sketch map
N42°19'60" - N43°00'00", E10°49'60" - E12°04'60"
Country of Publication: Italy
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201026
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