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Episodes 1982; 5(4): 22-25

Published online December 1, 1982

https://doi.org/10.18814/epiiugs/1982/v5i4/005

Copyright © International Union of Geological Sciences.

CHEMICAL PROCESSES IN DEFORMATION AT LOW METAMORPHIC GRADES: Pressure Solution and Hydraulic Fracturing

Alastair Beach

Exploration Team, British National Oil Corporation, 150 St. Vincent Street, Glasgow, G2 5LJ, U.K.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Pressure solution has long been recognized as an important mechanism of deformation, particularly in sedimentary rocks at low metamorphic grade. Geologists have tended to study only the most easily managed aspect of pressure solution structures – their geometry as a record of rock deformation. At the same time, the most common pressure solution structures, such as stylolites in limestones, clearly evolve through complex chemical processes, as do cleavage stripes and associated syntectonic veins which are abundant in terrigenous sedimentary rocks that have been deformed under low grade metamorphic conditions. This review focusses on stripes and veins, drawing together those concepts that need integrated study in order to reach a better understanding of pressure solution.