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

S. Morad; A. A. Aldahan

doi:10.1180/minmag.1986.050.356.26

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

S. Morad
, A. A. Aldahan

Earth Science

Uppsala University

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

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 language	British English
Pages (from-to)	340-343
Number of pages	4
Journal	Mineralogical Magazine
Volume	50
Issue number	2
DOIs	https://doi.org/10.1180/minmag.1986.050.356.26
State	Published - 1986

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

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.",

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T2 - electron-optical studies of phyllosilicate intergrowths in sedimentary and metamorphic rocks.

AU - Morad, S.

AU - Aldahan, A. A.

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N2 - 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.

AB - 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.

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

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