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Experimentally-determined solute yields from kaolinite-illite/muscovite assemblages under diagenetic conditions of pressure and temperature

Published online by Cambridge University Press:  09 July 2018

E. I. C. Rae
Affiliation:
Department of Earth Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
D. A. C. Manning
Affiliation:
Department of Earth Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, UK

Abstract

Experimental studies of reactions between water and kaolinite, kaolinite + quartz, kaolinite + quartz + muscovite and natural kaolinitic mudstones (Jurassic Draupne Formation; Norwegian North Sea; Rhaetic Westbury Formation, SW England; Tertiary ball clay, SW England) at 50 MPa and 150°C or 200°C have demonstrated that quartz saturation can be achieved readily at 200°C At 150°C quartz saturation is achieved for natural mudstones, but not for mineral mixtures because of slow reaction kinetics. Geochemical solution modelling demonstrates coincidence between observed fluid compositions and those expected for the solid mineral assemblage. In addition to inorganic solutes, organic acid anions including citrate are reported as products in experiments with natural mudstones (especially the Draupne Formation). Fluids supersaturated with respect to quartz are unlikely to be developed from mudstones which lack smectites or amorphous silica.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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