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Comparison of Evolution of Trioctahedral Chlorite/Berthierine/Smectite in Coeval Metabasites and Metapelites from Diagenetic to Epizonal Grades

Published online by Cambridge University Press:  28 February 2024

M. P. Mata ,
G. Giorgetti ,
P. Árkai  and
D. R. Peacor
M. P. Mata
Affiliation:
Department of Geology, The University of Cádiz, Pol. Rio San Pedro, 11510, Pto Real, Cádiz, Spain
G. Giorgetti
Affiliation:
Department of Earth Sciences, University of Siena, Via Laterina, 8, 53100, Siena, Italy
P. Árkai
Affiliation:
Laboratory for Geochemical Research, Hungarian Academy of Sciences, H-1112 Budaoersi, Budapest út 45, Hungary
D. R. Peacor
Affiliation:
Department of Geological Sciences, The University of Michigan, Ann Arbor, Michigan 48109, USA
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Abstract

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The evolution of texture, structure and chemical composition of chloritic clays in coeval pairs of metabasites and metapelites of a prograde sequence from the Bükk Mountains has been investigated using electron microscopy techniques. Samples are from the Bükkium (innermost Western Carpathians, Hungary) that underwent Alpine metamorphism, ranging from late diagenesis to epizone for pelites and from prehnite-pumpellyite to greenschist facies for the metabasites.

Although bulk-rock compositions, textures and primary minerals are different, chlorite evolved at similar rates in coeval metabasites and metasediments, but along different paths. The principal similarities in the prograde sequence are a decrease in the percentage of interstratified material in both dioctahedral and trioctahedral phyllosilicates and increase in thicknesses of chlorite and illite crystallites. The principal difference is in the type of interstratification in chlorite, with berthierine in metapelites, and smectite (saponite) in metabasites, although smectitic mixed layers also occur in the former. The evolution of trioctahedral phyllosilicates is marked by a decrease in the number of mineral species with increasing grade, chlorite, sensu stricto, being the only trioctahedral mineral at higher grades. This is consistent with the trend in reaction progress where both metastable systems (metabasites and metapelites) tend toward the same end-member, thermodynamically stable chlorite, as well as texture (crystal size), and where all intermediate states are metastable, and determined by the Ostwald step rule.

Keywords

AEMBerthierineBükk MountainsChloriteLow-grade MetamorphismReaction ProgressSmectiteTEMXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 49 , Issue 4 , August 2001 , pp. 318 - 332
Copyright
Copyright © 2001, The Clay Minerals Society

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