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Switches in the minimum compressive stress direction induced by overpressure beneath a low-permeability fault zone.

Colletini, C. and De Paola, N. and Goulty, N. R. (2006) 'Switches in the minimum compressive stress direction induced by overpressure beneath a low-permeability fault zone.', Terra nova., 18 (3). pp. 224-231.

Abstract

The Zuccale fault is a gently east-dipping normal fault exposed on Elba. Its displacement of 7–8 km occurred from the mid-Miocene to the Early Pliocene and the fault has been exhumed from a depth of 3–6 km. A complex hydrofracture system exposed in the footwall block consists of three orthogonal vein sets: two vertical sets trending N–S and E–W and one sub-horizontal. The veins show a crack-and-seal texture and mutually cross-cut each other. Throughout the period when the Zuccale fault was active, the regional stress field was extensional with the minimum principal stress oriented E–W, consistent only with the N–S trending set of vertical hydrofractures. We attribute the three sets of orthogonal fractures beneath the low-permeability phyllosilicate-rich fault core to switches in the minimum compressive stress direction induced by cyclic build-up and release of overpressure.

Item Type:Article
Full text:Full text not available from this repository.
Publisher Web site:http://dx.doi.org/10.1111/j.1365-3121.2006.00683.x
Record Created:01 Aug 2008
Last Modified:11 Jan 2011 14:31

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