OUCC Proceedings 11 (1983)
The Geology of Pozu Jorcada Blanca
|OUCC Proceedings 11 Contents
The area of Jorcada Blanca is located within the Picos de Cornion in the western part of the Picos de Europa, northern Spain. The entire region is largely developed in limestones of Carboniferous age which experienced major earth movements during the Hercynian. These began in the Westphalian with northerly thrusting, and continued in early Stephanian times with movements corresponding to the Asturian phase. The movements resulted in comparatively little folding, but in repeated thrusting and overfolding. This gave the mountains their pronounced east-west structure and topography, and means that the same sequence of rock types outcrops repeatedly from the north to the south of the region. Although there have been a number of studies of the Jorcada Blanca area in recent years, notably by the University of Oviedo, Marquinez (1978) and Farias-Arquer (1981), these have only succeeded in mapping the area (Figure 1) and have not made any detailed lithological analysis, let alone facies analysis of the limestones of the area.
The Jorcada Blanca area is composed solely of Carboniferous limes tones of Lower Viséan to Lower Namurian age, occasionally overlain by various unconsolidated deposits of Quaternary age. Four main limestone units can be recognised (Figure 2):
Farias-Arquer, P.J., 1981. La Estructura del Sector Central de Los Picos de Europa. Unpub. thesis, Univ. Oviedo, Spain.
Marquinez, J., 1978. Estudio geológico del sector SE de los Picos de Europa. Trabajos de Geologia 10, 295-315.