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An approach based on March's theory is applied to measurements of the anisotropy of electrical conductivity on samples and is used to quantify initial strain at the toe of the Nankai accretionary wedge. A quantitative determination of strain is possible from simple assumptions: passive reorientation offlat pores forming the porous network and existence of a linear relationship between fabric tensor and electrical conductivity tensor. We show that this simple model correctly accounts for the increase of anisotropy with compaction at a reference site located in the trench (Ocean Drilling Program drill Site 1173). At the toe of the accretionary wedge (Site1174), development of anisotropy in the horizontal plane and concurrent reduction of vertical plane anisotropy are observed. This can be explained by 12%horizontal ductile shortening, occurring after decollement initiation but before slip on imbricate thrust faults. Anisotropy in the underthrust sequence is correctly described by vertical compaction, consistent with decoupled stress states across the decollement. At Site 1174 the magnitude of ductile strain implies at least 75m slip on the decollement. Ductile shortening is associated with porosity loss, implying partly drained conditions above the decollement.

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Autor(es)

Henry , Pierre -  Jouniaux , Laurence -  Screaton , Elizabeth -  Hunze , Sabine -  Saffer , Demian - 

Id.: 71035065

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Palabras clave[ PHYS.PHYS.PHYS -  GEO -  PH ] Physics [physics]/Physics [physics]/Geophysics [physics.geo -  ph] - 

Tipo de recurso: info:eu-repo/semantics/article  -  Journal articles  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] ISSN: 0148-0227
[IsBasedOn] EISSN: 2156-2202
[IsBasedOn] Journal of Geophysical Research
[IsBasedOn] https://hal.archives-ouvertes.fr/hal-00108280
[IsBasedOn] Journal of Geophysical Research, American Geophysical Union, 2003, pp.doi:10.1029/2002JB002287. 〈10.1029/2002JB002287〉
[References] info:eu-repo/semantics/altIdentifier/doi/ 10.1029/2002JB002287

Fecha de contribución: 30-may-2018

Contacto:

Localización:
* hal-00108280
* DOI : 10.1029/2002JB002287

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