MODALITA' DELLA STRUTTURAZIONE NEOGENICA NELL'APPENNINO UMBRO-SABINO (ITALIA CENTRALE)

Abstract

Geological and structural analyses carried out in the Umbro-Sabine Apennines (Narni-Amelia Ridge, Martani Mts and Sabine Mts) have evidenced the presence of three main tectonic units which are superimposed along thrusts with a mainly NE vergence. The upper tectonic unit is the Narni-Amelia one, . s1ted in the hanging wall of the NW-SE trending_ N􀀧rni thrus_t pian􀀪, and involved in an overtumed macroantJcline trendmg ax1-ally NW-SE. The footwall of this thrust is represented by the Martani Mts unit, in which minor folds and thrusts (N-S trending) can be recognized. The geometrie relationships be­tween the two units point to a definitive emplacement of the Narni-Amelia unit over that of the already-structured Mar­tani Mts (out of sequence: thrust reactivation). [...]