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Dickite genesis in the ‘varicoloured’ clay-shale formation of the Italian Apennines: an isotopic approach

Published online by Cambridge University Press:  09 July 2018

F. Veniale ,
A. Delgado ,
L. Marinoni  and
M. Setti
F. Veniale
Affiliation:
Dipartimentodi Scienze dellaTerra, Università di Pavia, Italy
A. Delgado
Affiliation:
Departamento de Cienciasde laTierra y Química Ambiental, Estación Experimental del Zaidín-CSIC, GranadaSpain
L. Marinoni
Affiliation:
Dipartimentodi Scienze dellaTerra, Università di Pavia, Italy
M. Setti*
Affiliation:
Dipartimentodi Scienze dellaTerra, Università di Pavia, Italy
*
*E-mail: [email protected]
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Abstract

Dickite occurs over wide areas along the Italian Apennines strip throughout Italy, mainly in the allochtonous ‘varicoloured’ clay-shale formation. Morphological, fabric and crystallochemical features suggest an authigenic origin, from pore solutions. The nature of the solutions and the process of dickite formation, including hydrothermalism, diagenesis or supergene evolution have all been discussed. Stable isotope analysis (O, H) was performed to investigate these points. The δD values of dickite range between −63.7 and −79.1% (SMOW) and δ18O between +21% and +16.1‰ (SMOW), and are similar to those reported for kaolinites formed in equilibrium with meteoric waters. The data fall along the ‘Line of Meteoric Kaolinites’, supporting an origin involving meteoric waters and low temperatures. The isotopic compositions of the waters are within the range of Apennines meteoric water, and the temperatures derived are close to surface conditions. Contributions of diagenetic, hydrothermal or metamorphic waters must be discounted. The authigenic dickite from ‘varicoloured’ clays of the Italian Apennines formed by precipitation from flushing meteoric waters whose ingress was favoured by repeated surface erosion.

Keywords

claysdickitegenesisO/H stable isotopesvaricoloured clay-shalesItalian Apennines
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 2 , June 2002 , pp. 255 - 266
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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