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Experimental investigation of clogging of fissures and pores in granite

Published online by Cambridge University Press:  05 July 2018

A. C. M. Bourg ,
P. Oustrière  and
J. F. Sureau
A. C. M. Bourg
Affiliation:
Geochemical Processes Group, Département Gîtes Minéraux, National Geological Survey, BRGM, BP 6009, F-45060 Orléans Cédex, France
P. Oustrière
Affiliation:
Geochemical Processes Group, Département Gîtes Minéraux, National Geological Survey, BRGM, BP 6009, F-45060 Orléans Cédex, France
J. F. Sureau
Affiliation:
Geochemical Processes Group, Département Gîtes Minéraux, National Geological Survey, BRGM, BP 6009, F-45060 Orléans Cédex, France
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Abstract

Fluid flow through a fractured granite core and leaching experiments on granite powder (at constant temperatures of 50 and 100°C and during cooling from 100 to 50°C) indicate that the dissolved silica content of the fluids originates from the dissolution of feldspars and phyllosilicates. The dissolution of quartz is not ruled out but it should be a minor phenomenon. The precipitation of quartz may control the dissolved Si content during constant temperature leaching. During cooling from 100 to 50°C chalcedony, alumino-silicates, and chlorite are all capable of precipitation, possibly leading to some clogging or sealing of fissures.

Keywords

granitefluidsfissuressilica
Type
Research Article
Information
Mineralogical Magazine , Volume 49 , Issue 351 , April 1985 , pp. 223 - 231
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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