Direct shear experiments on Solnhofen limestone at high temperature .an experimental analogue of transpression .

  1. Llana Fúnez, Sergio 1
  2. Rutter, E.H.
  1. 1 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

Revista:
Trabajos de geología

ISSN: 0474-9588

Año de publicación: 2009

Número: 29

Páginas: 437-439

Tipo: Artículo

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Otras publicaciones en: Trabajos de geología

Resumen

Specimens of Solnhofen limestone deformed dry in direct shear at 600 ºC, 200 MPa and bulk strain rates of ~5×10-3 s-1, show strain distributed heterogeneously with two high-strain bands close to the specimen edges accommodating most of the displacement. Strain analysis using calcite shape fabric and CPO (measured by EBSD) reveals that non-coaxial strain concentrating at the edges propagates towards the middle of the specimen, where flattening strain is predominant. Strain-hardening associated with flattening prevents initially non-coaxial strain from developing in the centre. Direct shear testing proves to be a good analogue for transpression when free boundaries are present to allow lateral extrusion.

Referencias bibliográficas

  • LLANA-FÚNEZ, S. and RUTTER, E. H. (2005): Distribution of nonplane strain in experimental compression of short cylinders of Solnhofen limestone. J. Struct. Geol., 27: 1205-1216.
  • LLANA-FÚNEZ, S. and RUTTER, E. H. (2008): Strain localization in direct shear experiments on Solnhofen limestone at high temperature – Effects of transpression. J. Struct. Geol., 30: 1372-1382 doi:10.1016/j.jsg.2008.07.004.
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