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

Autor(es) y otros:
Fernández Rodríguez, Francisco JoséAutoridad Uniovi; Brown, Dennis; Álvarez-Marrón, Joaquina; Pérez-Estaún, AndrésAutoridad Uniovi; Menéndez-Duarte, Rosa AnaAutoridad Uniovi
Palabra(s) clave:

constrictiona/ e-axis fabrics, arkose, pressure solution, microstructure

Fecha de publicación:
2004-07-01
Editorial:

Sociedad Geológica de España

Citación:
Geo Temas, 6(3), p. 37-40 (2004)
Descripción física:
p. 37-40
Resumen:

Arkosic sandstone interlayered within ca/cite mylonites at the base of the southern Ura/s accretionary prism preserves thefr original sedimentary microstructure and presents only a weak shape and crystal/ographic preferred orientation (SPO and CPO, respective/y). SPOs of XZ-sections show fabrics mainly formed by pressure so/ution, where quartz and feldspar grains have a characteristic bimoda/ shape and the mean axial ratio of the finite strain is c. 2. The unusual pattern described by the quartz e-axes fabrics formed during the acquisition of their SPOs is characterised by girdles normal to Y. At the light of our results, and accordingly with the deformation conditions of the ca/cite mylonites, the quartz e-axis preferred orientation may be formed by pressure solution under constrictiona/ strain, and notas usual/y occurs by intracrystalline p/asticity.

Arkosic sandstone interlayered within ca/cite mylonites at the base of the southern Ura/s accretionary prism preserves thefr original sedimentary microstructure and presents only a weak shape and crystal/ographic preferred orientation (SPO and CPO, respective/y). SPOs of XZ-sections show fabrics mainly formed by pressure so/ution, where quartz and feldspar grains have a characteristic bimoda/ shape and the mean axial ratio of the finite strain is c. 2. The unusual pattern described by the quartz e-axes fabrics formed during the acquisition of their SPOs is characterised by girdles normal to Y. At the light of our results, and accordingly with the deformation conditions of the ca/cite mylonites, the quartz e-axis preferred orientation may be formed by pressure solution under constrictiona/ strain, and notas usual/y occurs by intracrystalline p/asticity.

URI:
https://hdl.handle.net/10651/73975
ISSN:
1576-5172
Patrocinado por:

BTE 2002-00187 y ERC FMRXCT 960009

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