Procedencia de los materiales terrígenos finos del Paleógeno continental, zona de Vic, NE España

Abstract

In the Vic area, the non-marine Palaeogene clastic materials are arranged in two successive lithostratigraphic formations: the lower, Vilanova de Sau (VS) mainly composed of lutites and some channels of sandstones, and the upper, Romagats (RO) mainly consisting of conglomeratic sandstones with few lutitic intercalations. The VS is interpreted as distal and lateral alluvial fan facies, whereas the RO is regarded as alluvial fan proximal facies. The clay mineral analysis, the study of the main palaeocurrents and the different clast lithologies distribution along the studied stratigraphic logs suggest that the source area was located to the east of the present outcrops. In addition, the geochemical analysis of the fine-grained materials provide more evidence that the main source area was placed eastwards, at the area at present occupied by the Mediterranean sea and relatively near the coast