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The Messinian "Calcare di Base" (Sicily, Italy) revisited

Vinicio Manzi, Stefano Lugli, Marco Roveri, B. Charlotte Schreiber and Rocco Gennari
The Messinian "Calcare di Base" (Sicily, Italy) revisited
Geological Society of America Bulletin (January 2011) 123 (1-2): 347-370


Three different types of carbonate deposits are included within the "Calcare di Base," commonly envisaged to record the Messinian salinity crisis onset: type 1 consists of sulfur-bearing limestones, representing the biogenic product of bacterial sulfate reduction after original gypsum; type 2 comprises dm-thick, laminated dolomitic limestones interbedded with diatomites, sapropels, and marls found at the top the Tripoli Formation; type 3, the most common variety, consists of m-thick, brecciated limestones interbedded with shales and clastic gypsum. Type 3 shows sedimentary features suggesting a clastic origin and deposition from high- to low-density gravity flows; thus, these deposits can be regarded as an end-member of a large variety of evaporite-bearing, gravity-flow deposits, with a dominant carbonate component. The genetic and stratigraphic characterization of these carbonates has strong implications for a better comprehension of Messinian events; the three types of Calcare di Base seem to have formed during different stages of the Messinian salinity crisis (MSC). Type 2 formed in the first stage (5.96-5.60 Ma), and is the only type that can be regarded as the Lower Gypsum time-equivalent. Type 3 was deposited in the second stage (5.60-5.55 Ma), and its base is associated with a regional-scale hiatus and erosion (Messinian erosional surface). Type 1 formed even later, likely in post-Messinian time, through diagenetic processes affecting resedimented gypsum deposited during the second stage of the MSC. It follows that not all the Calcare di Base deposits record the onset of the Messinian salinity crisis, as commonly thought. Thus, a detailed facies characterization of these carbonate deposits is fundamental for both stratigraphic reconstructions and a better comprehension of Messinian events.

ISSN: 0016-7606
EISSN: 1943-2674
Serial Title: Geological Society of America Bulletin
Serial Volume: 123
Serial Issue: 1-2
Title: The Messinian "Calcare di Base" (Sicily, Italy) revisited
Affiliation: Universita di Parma, Dipartimento di Scienze della Terra, Parma, Italy
Pages: 347-370
Published: 201101
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 56
Accession Number: 2011-012653
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., geol. sketch maps
N36°45'00" - N38°15'00", E12°00'00" - E15°00'00"
Secondary Affiliation: Universita di Modena e Reggio Emilia, ITA, ItalyUniversity of Washington, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201108
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