Caracterización mineral de zonas de falla ricas en minerales fibrosos de la arcillauna aproximación experimental y termodinámica

  1. Diana Catalina Sánchez Roa
Supervised by:
  1. Juan Jiménez Millán Director
  2. Fernando Nieto Garcia Director
  3. Daniel Faulkner Director

Defence university: Universidad de Jaén

Fecha de defensa: 03 July 2017

  1. Martine Buatier Chair
  2. Isabel Abad Martínez Secretary
  3. Blanca Bauluz Lázaro Committee member

Type: Thesis

Teseo: 521059 DIALNET lock_openRUJA editor


This thesis aims to identify the origin, thermodynamic stability and mechanical behaviour of fibrous clay minerals in fault zones. The results obtained suggest that the presence of fibrous clay minerals in fault zones can be a product of Mg-enrichment, catalysed by deformation and fluid circulation that promote mineral reactions and transformations. Hydration and volume changes as well as mineral reactions involving sepiolite were modelled using a thermodynamic approach that limits the stability of sepiolite to 325°C and is limited by the reaction sepiolite→talc+quartz+H2O. Furthermore, triaxial friction experiments established that fibrous clay minerals have higher frictional strength than their planar equivalents as a consequence of their different crystal structure. These result suggest that fibrous clay minerals can indeed be present and influence the distribution of seismogenic areas in Mg-rich fault systems.