Fábricas constrictivas de ejes-c de cuarzo en arcosas deformadas por disolución por presión

  1. F.J. Fernández 1
  2. D. Brown 2
  3. J. Álvarez-Marrón 2
  4. A. Pérez-Estaún 2
  5. R. Menéndez-Duarte 1
  1. 1 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

  2. 2 Instituto de Ciencias de la Tierra “Jaume Aimera” (CSIC)
Revista:
Geotemas (Madrid)

ISSN: 1576-5172

Año de publicación: 2004

Título del ejemplar: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)

Número: 6

Páginas: 37-40

Tipo: Artículo

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Otras publicaciones en: Geotemas (Madrid)

Resumen

Arkosic sandstone interlayered within calcite mylonites at the base o f the southern Urals accretionary prism preserves their original sedimentary microstructure and presents only a weak shape and crystallographic preferred orientation (SPO and CPO, respectively). SPOs of XZ-sections show fabrics mainly formed by pressure solution, where quartz and feldspar grains have a characteristic bimodal shape and the mean axial ratio of the finite strain is c. 2. The unusual pattern described by the quartz c-axes fabrics formed during the acquisition o f their SPOs is characterised by girdles normal to Y At the light o f our results, and accordingly with the deformation conditions o f the calcite mylonites, the quartz c-axis preferred orientation may be formed by pressure solution under constrictional strain, and not as usually occurs by intracrystalline plasticity.

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