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Corrensite and chlorite-rich Chl-S mixed layers in sandstones from the ‘Macigno’ Formation (northwestern Tuscany, Italy)

Published online by Cambridge University Press:  09 July 2018

L. Leoni ,
M. Lezzerini ,
S. Battaglia  and
F. Cavalcante
L. Leoni
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy
M. Lezzerini
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy
S. Battaglia*
Affiliation:
Institute of Geosciences and Earth Resources, National Research Council of Italy, Via G. Moruzzi 1, 56124 Pisa, Italy
F. Cavalcante
Affiliation:
Institute of Methodologies for Environmental Analysis, National Research Council of Italy, C.da S. Loja, 85050 Tito Scalo, Italy
*
*E-mail: battaglia@igg.cnr.it
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Abstract

Corrensite and chlorite-rich chlorite-smectite (Chl-S) mixed-layers occurring in the Macigno Formation of northwestern Tuscany were investigated by XRPD/SEM techniques. The samples from the Macigno outcrops were affected by metamorphism corresponding to the high-diagenesis/low-anchizone transition boundary. The basal spacing of corrensite measured from 00l reflections on EG–Mg2+-saturated samples ranges from 30.97 to 31.18 Å with a coefficient of variation (CV) of 0.46–0.77%, consistent with the rational pattern of a 1:1 Chl-S periodic stacking sequence. X-ray patterns of heated K+-saturated specimens reveal the presence of two types of corrensite, probably with different interlayer charges on their respective smectite-like layers. The chlorite-rich Chl-S mixed layers coexisting with corrensite consist of R2 chlorite (0.70–0.75)/S and chlorite (0.90)/S with long-range ordering R ⩾ 1. SEM observations show that corrensite and chlorite-rich Chl-S mixed-layers are closely mixed on a sub-micron scale. Some grains of corrensite and chlorite-rich Chl-S mixed-layers include zones (2–10 μm) of chlorite composition, as shown by microprobe analyses.

Keywords

corrensitechlorite-rich Chl-S mixed-layersMacigno Formationhigh diagenesis–low anchizone transitionItaly
Type
Research Article
Information
Clay Minerals , Volume 45 , Issue 1 , March 2010 , pp. 87 - 106
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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