Chemistry of Detrital Biotites and Their Phyllosilicate Intergrowths in Sandstones
- 1 October 1986
- journal article
- Published by Cambridge University Press (CUP) in Clays and Clay Minerals
- Vol. 34 (5) , 539-548
- https://doi.org/10.1346/ccmn.1986.0340507
Abstract
Microprobe analyses of optically homogeneous detrital biotites from sandstones of the Visingsö Group and the Dala Sandstone, Sweden, revealed a consistently low K content (generally μm. Microprobe analyses of some thick (∼5 μm) illitic layers indicated a phengitic composition, wherein the mica was relatively rich in octahederal Fe and Mg. The chloritic layers appeared to be Fe-Mg-rich and generally had octahederal totals of <6 atom/formula unit. Variations in the chemical composition of the biotite and some of the illite and chlorite were probably due to an uneven distribution of small amounts of the interstratified phases. The illite and chlorite layers were apparently formed by pseudomorphic replacement of detrital biotites, i.e., gradual replacement of one biotite layer by one layer(s) of illite and/ or chlorite during diagenesis.Keywords
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