| Titre | Dating fault gouge: a critical review and case studies |
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| Auteur | Kellett, D A |
| Source | CTG 2017: sbstracts and program; 2017 p. 7  Accès
ouvert |
| Liens | Online - En ligne
(complete volume - volume complet, PDF, 944 KB)
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| Image |  |
| Année | 2017 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190223 |
| Éditeur | Canadian Tectonics Group |
| Réunion | CTG 2017: Canadian Tectonics Group Workshop; Kelowna, BC; CA; 2017 |
| Document | livre |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | pdf |
| Sujets | datation radiométrique; datation au potassium-argon; datation argon-argon; géologie du substratum rocheux; caractéristiques structurales; failles; zones de failles; évolution tectonique; formation de
failles; débris; minerais argileux; antecedents thermiques; diffusivité thermique; diffusion; analyses granulométriques; fractionation; analyses par diffraction des rayons x; microscopie électronique; Méthodologie; géochronologie; tectonique;
Sciences et technologie; Nature et environnement |
| Programme | GEM2 : La géocartographie de l'énergie et des minéraux Évolution tectonique du Yukon, haut mésozoïque au tertiaire de l'ouest de la
Cordillère |
| Diffusé | 2017 01 01 |
| Résumé | (disponible en anglais seulement)
Fault gouge forms within the damage zone of brittle faults during frictional slip. The gouge is a product of mechanical communition of wall rock materials and
growth of new, clay-sized minerals. Fault gouge, much like the fault zone itself, forms a cumulative record of the fault's slip history. When gouge is collected from core or at the Earth's surface, it may thus contain detrital materials from one or
more wall rocks, and authigenic clays from one or more slip events. Any K-bearing materials within the gouge, whether detrital or authigenic, accumulate daughter radiogenic 40Ar over geological time. However, these materials can also partially or
fully lose 40Ar by thermal diffusion during the fault's evolution. Thus the challenges in interpreting fault gouge ages are many.
Because of the small size of the materials in gouge, our ability to separate and characterize the individual
materials of different sources is limited to grain size separations. A typical approach to dating fault gouge is to perform one to several grain size separations, characterize each using X-ray diffraction, scanning electron and/or transmission
electron microscopy, and then date the size fractions using K-Ar or encapsulation Ar/Ar methods. Case studies from Canadian and other field areas provide opportunities to compare these approaches to dating fault gouge, and highlight some of the
successes and challenges in interpreting results. |
| GEOSCAN ID | 321388 |
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