Discussion and comments on the paper: electron-optical studies of phyllosilicate intergrowths in sedimentary and metamorphic rocks.

S. Morad, A. A. Aldahan

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The authors agree with the conclusion of White et al. (M.A. 85M/3533) that the origin of chlorite-illite (phengite) intergrowths is mainly by diagenetic and low-grade metamorphic alteration of detrital biotite. They dispute, however, that biotite changes to chlorite via an intermediate K-depleted biotite and suggest that the main change in composition of biotite by chloritization is the decrease in K content. They also prefer a net transformation reaction: 1 fresh biotite + 3.4H+ + 0.8H2O = 0.4 chlorite + 0.4 illite + 1.3K+ + 0.2H2SiO4 + 0.6Mg2+ + 0.4Fe2+.-R.A.H.

Original languageEnglish
Pages (from-to)340-343
Number of pages4
JournalMineralogical Magazine
Volume50
Issue number2
DOIs
Publication statusPublished - 1986
Externally publishedYes

ASJC Scopus subject areas

  • Geochemistry and Petrology

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