Trace elements distribution and mineralogical composition in the <2-µm size fraction of shales from the Southern Apennines, Italy

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Authors:Mongelli, G.
Author Affiliations:Primary:
Univ. Studi Basilicata, DiSGG, Potenza, Italy
Volume Title:Mineralogy and Petrology
Source:Mineralogy and Petrology, 53(1-3), p.103-114. Publisher: Springer-Verlag, Vienna, Austria. ISSN: 0930-0708
Publication Date:1995
Note:In English with German summary. 42 refs.; illus., incl. 3 tables, 18 anals.
Summary:The clay mineral assemblage consists of illite and smectite (detrital micaceous precursor), kaolinite and minor chlorite. Chemical data, normalized with respect to the post-Archean Australian shales, indicate depletion of Ba, Rb, Y, Zr and enrichment of Nb. REE-patterns exhibit a positive Eu anomaly and HREE depletion. A kaolinite-rich sample has high ΣREE contents in contrast to smectite-rich fractions. Illite-rich samples do not show Eu anomalies. Statistical data processing indicates a link between Ti, P, Y, Zr, Nb and Yb, suggesting that accessory phases may play a role in controlling HREE and that the observed LREE/HREE fraction may also be due to hydraulic sorting of these phases. A La-kaolinite relationship accounts for the capability to host LREE. The Eu anomaly is a source inherited feature, probably not determined solely by clay minerals. [H.E.]
Subjects:Cenozoic; Chlorite; Chlorite group; Clastic rocks; Clay mineralogy; Clay minerals; Correlation coefficient; Cretaceous; Factor analysis; Fines; Illite; Kaolinite; Major elements; Mesozoic; Metals; Mineral composition; Modal analysis; Rare earths; Regression analysis; Sedimentary rocks; Shale; Sheet silicates; Silicates; Smectite; Statistical analysis; Tertiary; Trace elements; Upper Cretaceous; Apennines; Campania Italy; Europe; Italy; Southern Apennines; Southern Europe
Abstract Numbers:95M/4501
Record ID:1999010625
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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