Lineamientos y fracturacion en el extremo oriental de la Rama Aragonesa de la Cadena Iberica (cuenca de Montalban)

Abstract

The analysis of Landsat lineaments at the eastern end of the Aragonian Branch (comprising the palaeozoic core of the Montalban anticline, the Tertiary Montalban basin and several outcrops of Mesozoic rocks) shows a constant NE-SW direction maximum throughout the area, with a secondary NW-SE maximum.

The lineament pattern remains unchanged when analysing separately lineaments in rocks of different ages (Paleozoic, Mesozoic, Paleogene, Neogene). The maximum density estimated from cumulative length of lines is 2 km per km2. The comparison with geological maps and field observations allow to interpret lineaments as fractures and faults, many of them with little or no offset. The main NE-SW trend seems to correspond to Late Variscan faults reactivated during the mesozoic as extensional faults at the Mesozoic basins North and South of the studied area. The NW-SE maximum coincides with the main structural trend of the Aragonian Branch. Lineaments trending N-S to NNW-SSE are scarce and limited to the surroundings of the Alpeh6s fault