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Geochemistry of Late Cretaceous-Oligocenic shales from the Varicolori Formation, Southern Apennines, Italy; implications for mineralogical, grain-size control and provenance

Giovanni Mongelli, Robert L. Cullers and Stephen Muelheisen
Geochemistry of Late Cretaceous-Oligocenic shales from the Varicolori Formation, Southern Apennines, Italy; implications for mineralogical, grain-size control and provenance
European Journal of Mineralogy (August 1996) 8 (4): 733-754

Abstract

Shales from this formation, and size fractions from them, were analysed for major and trace elements, including the REE. The shales consist mainly of illite and smectite, with lesser chlorite, kaolinite, quartz and feldspar, together with variable calcite (0-28 wt.%) and accessory garnet, zircon, apatite, xenotime and an unidentified Ti oxide. Factor analysis suggests that most trace elements are controlled by accessory minerals rather than by major minerals; thus mass-balance calculations show that 50% of La, 83% of Sm, and 100% of Tb and Yb can be due to monazite, xenotime and apatite. The total contribution of phosphatic phases and zircon to Eu contents, however, is minor (16%), whereas the contribution of the feldspars is limited to approximately 30%; a significant amount of Eu can thus be controlled by 2:1 clay phases. The lowest concentration densities for most trace elements are in the finer fractions dominated by clay minerals; in contrast, the highest concentration densities for most trace elements are in the silt-sized fractions dominated by chlorite, quartz or calcite. The Eu/Eu* and Th/Sc ratios are the most similar in different size fractions, whereas the Cr/Th and Co/Th ratios are very variable. In these shales the mineralogy and elemental ratios suggest a provenance of low- to medium-grade metamorphic rocks of intermediate crustal composition, remnants of which currently form the Calabrian-Peloritan arc.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 8
Serial Issue: 4
Title: Geochemistry of Late Cretaceous-Oligocenic shales from the Varicolori Formation, Southern Apennines, Italy; implications for mineralogical, grain-size control and provenance
Affiliation: Universita della Basilicata, DiSGG, Potenza, Italy
Pages: 733-754
Published: 199608
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 62
Accession Number: 1996-066130
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables, geol. sketch map
N40°30'00" - N41°15'00", E15°00'00" - E17°00'00"
Secondary Affiliation: Kansas State University, USA, United StatesUniversity of Tennessee, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199620
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