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Fluid percolations in a fault zone: a study of fluid inclusion planes in the St Sylvestre granite, northwest Massif Central, France

Authors
Journal
Tectonophysics
0040-1951
Publisher
Elsevier
Publication Date
Volume
184
Issue
2
Identifiers
DOI: 10.1016/0040-1951(90)90052-a
Disciplines
  • Chemistry
  • Mathematics

Abstract

Abstract A method for relating fluid flow evolution (direction of fluid percolation) to the bulk brittle network (microfracture system) at each state in a sequence of deformational events is presented. Fluids percolating through cracks are generally trapped as fluid inclusion planes (alignment of fluid inclusions). The method involves the use of fluid inclusions not only as a tool for the establishment of the physico-chemical conditions under which fluids were entrapped, but also as a microstructural marker of the geometry of permeability. The study shows that through the determination of the paleopressures for each stage of fluid migration, the chronology of the cracks and P-T conditions prevailing during each crack formation can be established. This methodology has focussed on a granitic example from the French Massif Central, but may be applied to other geological environments.

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