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First Occurrence of Dickite in “Varicolored Clays” in the Northern Apennines (Oltrepo Pavese), Italy

By
F. Cellé
F. Cellé
Department of Earth Sciences, University of Pavia via Bassi, 4-27100 Pavia, Italy
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P. Granata
P. Granata
Department of Earth Sciences, University of Pavia via Bassi, 4-27100 Pavia, Italy
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M. Setti
M. Setti
Department of Earth Sciences, University of Pavia via Bassi, 4-27100 Pavia, Italy
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F. Veniale
F. Veniale
Department of Earth Sciences, University of Pavia via Bassi, 4-27100 Pavia, Italy
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Published:
January 01, 1993

Abstract

Dickite has previously been reported in “varicolored clays” of different ages in the Central and Southern Italian Apennines and in Sicily. Recently, dickite has been observed to occur randomly in Cretaceous “varicolored clays” belonging to the Scabiazza sandstone formation in the Oltrepo Pavese area of the province of Pavia (Northern Apennines).

Field observations, crystal-chemical characteristics (XRD and EDS analysis), morphological and fabric features (SEM observations) of the dickite platelets support an authigenic origin by precipitation from pore solutions. Controversial interpretations concerning the nature of such interstitial solutions, and the origin of dickite include:

  1. diagenetic squeezing in an almost closed chemical system during tectonic events;

  2. supergene origin in an open system, thermodynamically dependent on the physico-chemical characteristics of the solutions, which may be mixed with meteoric waters.

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Contents

Clay Minerals Society Special Publication

Kaolin Genesis and Utilization

Haydn H. Murray
Haydn H. Murray
Dept. of Geological Sciences Indiana University Bloomington, IN 47405
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Wayne M. Bundy
Wayne M. Bundy
3026 Chase Lane Bloomington, IN 47401
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Colin C. Harvey
Colin C. Harvey
Dept. of Geological Sciences Indiana University Bloomington, IN 47405
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Clay Minerals Society
Volume
1
ISBN electronic:
9781881208389
Publication date:
January 01, 1993

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