La tectónica alpina en el sector centro-oriental del borde norte del Sistema Central (provincia de Segovia, España).

Resumen

A microstructural analysis has been completed in the Northern edge of the Spanish Central System (Segovia province). The analysis is based op the study of 5 sites of homogeneously-distributed faults, which are located either in Paleozoic or Mesozoic rocks, or in both of them. Altogether, 7 62 couples of fault-striae have been measured- The fault population analysis methods that have been applied on them are the following: slip model (Reches, 1983; De Vicente, 7 988); right dieder method (Angelier y Mechler, 1977) and Delvaux (1993). The comparison of the results obtained from the different methods has made possible to find out the shortening direction and the shape and orientation of the stress tensor for each Station. Two different tensors have been defined. A extensional ope, having a compression direction EO, attributed to the Hiendelaepcina phase, and a transpressive one with a compression direction N 160 E, corresponding to the Guadarrama phase