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J. I. PINUAGA ESPEJEL Y A. RAMÍREZ ORTEGA AN. R. ACAD. NAC. FARM.

A pesar del marcado carácter kárstico de esta unidad hidrogeológica, en la que
existen importantes cavidades como las de Basconcillos del Tozo, Tobazo, Pozo
Azul y Orbaneja del Castillo, las aguas no presentan indicios de contaminación
agrícola ni industrial, aunque sí existe la posibilidad de una contaminación directa
de los manantiales del balneario por la vegetación y fauna existente en la zona o
por avenidas del río Rudrón.

Palabras clave: Geología.—Hidrogeología.—Protección.

ABSTRACT

Geology and Hydrogeology of Valdelateja Spa. Sedano Valley (Burgos)

The mineral-medical waters of the Valdelateja Spa rise with a flow of 1,5 and
0,3 L/s and a temperature of 19,6º C at both sides of the riverbed of the river
Rudrón, contacting the crest base limestone-dolomitic massive almost walls vertical
of the Turoniense medium, arranged on the cretacic materials of the lower
Turoniense, made up by the greenish-grey marls, which thicknest isn’t more that
50 m, under which we can find a package of dolomites and sandstones and the
formation of Utrillas sands, belonging to the Albense-Cenomanense, with a
thickness between 125 and 250 m, that some kilometres further down of the Rudrón
river, meeting with the Ebro river, they´re uncovered due to the erosion produced
by the canalization of the river system in Quintanilla-Escalada.

Both springs are located in a hydrogeological unit known Sedano-La Lora
belonging to the hydrographic basin formed by extensive bleak plateau between
Poza de la Sal and Sargentes de la Lora, that configurate the known Páramo de
Masa, La Lora y Valle de Sedano. According to the geological structure we can
distinguish the materials into 2 areas with different hydrogeological behaviour:
one, the Tectonic Area of the Zamanzas-Puerto de la Mazorra, in which the tight
folding and the intense fracturation make the interconexion easier between the
existent permeable levels; and another one, the Structural Platform of the Páramos,
to which the springs are associated, whose smooth folding and the absence of
important faults favour the disconnection between the aquifers levels, separated
from the permeables sections.

Despite the marked karstic character of this hydrogeological unit in which
important cavities can be found such as: Basconcillos del Tozo, Tobazo, Pozo Azul
and Orbanega del Castillo, the water do not have any side of agriculture or
industrial pollution, although it is possible to find direct pollution of the springs
of the Spa due to the vegetation and fauna existing in the area or by flood of the
Rudrón river.

Key words: Geology.—Hidrogeology.—Protection.

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