Chapter

Pre-Mesozoic Geology of Iberia

Part of the series IGCP-Project 233 pp 103-114

Structure

  • J. R. Martinez CatalanAffiliated withDepartamento de Geología, Facultad de Ciencias, Universidad
  • , A. Perez EstaunAffiliated withDepartamento de Geología, Facultad de Geologia, Universidad
  • , F. BastidaAffiliated withDepartamento de Geología, Facultad de Geologia, Universidad
  • , J. A. PulgarAffiliated withDepartamento de Geología, Facultad de Geologia, Universidad
  • , A. MarcosAffiliated withDepartamento de Geología, Facultad de Geologia, Universidad

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Abstract

The structural configuration of the West Asturian-Leonese Zone (WALZ) may be appreciated from the cross-sections of Fig. 1, the location of the main structures are depicted in Fig. 1 of the previous chapter dealing with Stratigraphy. Three major types of structure, originally recumbent folds with E vergence, thrust faults and large open folds with steep axial surfaces, are superimposed in that order. These structures determine, together with an important normal fault to the W known as the Vivero Fault, the structural pattern of the zone. Of special interest among the recumbent folds are the Mondoñedo-Lugo-Sarria anticline (Matte 1968 b) and the Villaodrid syncline (Walter 1966), both of which are in the Mondoñedo Domain (MD). The reverse limb common to both folds attains 20 km in cross-sectional length. Among the thrusts, the one which bounds the Mondoñedo thrust sheet (Marcos 1973; Martínez Catalán 1980, 1985; Bastida et al. 1986) is of interest: this unit is an allochthonous structure that occupies most of the western part of the WALZ.