The effects of lithology, bulk chemistry and modal composition on illite "crystallinity' - a case study from the Bakony Mts., Hungary

P. Arkai, G. Lelkes-Felvari

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11 Citations (Scopus)

Abstract

Modal and bulk chemical compositions, illite and chlorite "crystallinity' indices (IC and ChC), white mica bo and vitrinite reflectance values of a Palaeozoic variegated clastic sequence have been determined. The strongly varying IC values are inadequate for the determination of metamorphic zones. Based on statistical analyses of the factors which might affect IC, the presence of paragonite proved to be the decisive factor. No significant correlations were found between the modal composition of the main phases, bulk chemical composition and IC, ChC, or white mica bo values. Thus, neither lithofacies, nor redox conditions had any effect on "crystallinity' and bo parameters. Chlorite crystallinity indices and vitrinite reflectance values, together with IC values of selected samples, indicate "anchizonal' conditions. -from Authors

Original languageEnglish
Pages (from-to)417-433
Number of pages17
JournalClay Minerals
Volume28
Issue number3
DOIs
Publication statusPublished - Jan 1 1993

ASJC Scopus subject areas

  • Geochemistry and Petrology

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