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Mica Alteration Reactions in Jurassic Reservoir Sandstones from the Haltenbanken Area, Offshore Norway

Published online by Cambridge University Press:  02 April 2024

Sadoon Morad
Sadoon Morad*
Affiliation:
Department of Mineralogy and Petrology, Institute of Geology, Uppsala University, Box 555, S-751 22 Uppsala, Sweden
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Abstract

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Petrographic observations indicate that dolomite, siderite, pyrite, Ti oxides, quartz, and K-feldspar formed as by-products of mica alteration during diagenesis of Jurassic reservoir sandstones of the Haltenbanken area (offshore central Norway). These minerals precipitated on a mica-grain scale or a thin-section scale. Modal analyses and mass-balance calculations of muscovite alteration to kaolinite and of biotite to kaolinite, illite, and chlorite suggest limited elemental mobility during sandstone diagenesis. The alteration of mica to kaolinite occurred in sandstones buried <2200 m deep (present temperature < 70°C), whereas illitization and chloritization of biotite occurred during burial to depths > 3000 m (present temperature >95°C).

Keywords

AlterationBurial diagenesisChloriteIlliteKaoliniteMicaSandstone
Type
Research Article
Information
Clays and Clay Minerals , Volume 38 , Issue 6 , December 1990 , pp. 584 - 590
Copyright
Copyright © 1990, The Clay Minerals Society

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