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Chemical and minero-petrographic features of Plio-Pleistocene fine-grained sediments in Calabria, southern Italy

Francesco Perri, Luigi Borrelli, Giovanni Gulla and Salvatore Critelli
Chemical and minero-petrographic features of Plio-Pleistocene fine-grained sediments in Calabria, southern Italy
Italian Journal of Geosciences (February 2014) 133 (1): 101-115

Abstract

The composition of Plio-Pleistocene fine-grained sediments from different areas of Calabria (southern Italy), have been studied to unravel the interplay of provenance. The use of multivariate statistical methods (e.g., PCA) based on biplot, allows for the discrimination of different groups of sediments. The general chemical composition of the fine-grained samples reflects the mineralogical variation observed in the sediments, which are composed of phyllosilicates, quartz, calcite, dolomite and feldspars. The I-S mixed layers, 10 Aa-minerals (illite and micas) are the most abundant phyllosilicates, chlorite and kaolinite are present in variable amounts, and smectite and chlorite/smectite mixed layers are presents in trace amounts. These chemical and mineralogical variations are also confirmed by SEM analysis, which also demonstrates that phyllosilicates are characterized by open and folded structures with generation of neoformed clay minerals. Provenance proxies and element ratios testify greater input of felsic source rocks, with lack of a marked mafic-ultramafic detritus input for all studied sediments, and the minero-petrographical features of the studied fine-grained sediments. These chemical and mineralogical variations are also confirmed by SEM analysis showing abundant phyllosilicate minerals for Groups 1 (Crotone Basin) and 2 (Crati Graben) and high content of quartz and feldspars grains for Group 4 (Catanzaro Graben) samples, probably due to abundant siliciclastic input coming from plutonic-metamorphic source and associated Mesozoic to Miocene sedimentary sources (Sila and Serre Massifs), and abundant calcium-carbonate phases mainly related to the presence of planktonic calcareous microfossils (Globigerina and coccoliths) for Groups 3 (southern Ionian coast) and 5 (southern Tyrrhenian coast). Furthermore, paleogeographic reconstructions characterized by re-establishment of open-marine conditions in the Mediterranean following the Messinian salinity crisis at the beginning of the Pliocene, play an important role. A progressive increase in the connectivity of Mediterranean sub-basins with the Atlantic (e.g., sub-basins at the south of the Catanzaro Strait, characterized by normal water supply) and Paratethys (e.g., sub-basins at the north of the Catanzaro Strait, characterized by freshwater supply) can be envisaged during the Neogene period; this paleogeographic reconstruction may also explain the different composition among the studied samples.


ISSN: 2038-1719
EISSN: 2038-1727
Serial Title: Italian Journal of Geosciences
Serial Volume: 133
Serial Issue: 1
Title: Chemical and minero-petrographic features of Plio-Pleistocene fine-grained sediments in Calabria, southern Italy
Affiliation: Universita della Calabria, Dipartimento di Biologia, Ecologia e Scienze della Terra, Cosenza, Italy
Pages: 101-115
Published: 201402
Text Language: English
Publisher: Societa Geologica Italiana, Rome, Italy
References: 76
Accession Number: 2014-025847
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch map
N38°00'00" - N40°10'00", E15°45'00" - E17°00'00"
Secondary Affiliation: Consiglio Nazionale delle Ricerche, ITA, Italy
Country of Publication: Italy
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Societa Geologica Italiana. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201416
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