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Estudio geológico preliminar de un sector del cierre periclinal del Sinclinorio de Truchas (León): El anticlinal de Manzaneda

Preliminary geological study on a small area at the periclinal closure of the Truchas Synclinorium: the Manzaneda anticline
Authors: Férnandez Lozano, Javier;

Estudio geológico preliminar de un sector del cierre periclinal del Sinclinorio de Truchas (León): El anticlinal de Manzaneda

Abstract

[ES] El anticlinal de Manzaneda (Cabrera Alta, León) representa una estruc- tura tectónica de dirección N110ºE, con inmersión hacia el NO a lo largo del cierre del Sinclinorio de Truchas. Su núcleo es cuarcítico (Ordovícico) y está afectado por una red de diaclasas asociadas a venas de cuarzo. Además, el anticlinal está intersectado por una falla inversa que levanta su flanco sur, inclinándolo hacia el SO. Esta falla está segmentada por fallas posteriores que la desplazan. Las estructuras mayores en la zona están cubiertas por sedimentos Terciarios, indicando una edad Pre-Cenozoica. En general, el cli- vaje impuesto sobre las rocas pelíticas es penetrativo, caracterizado por fo- liación de plano axial de orientación NO-SE. Este clivaje está modificado por la presencia de micropliegues, indicando una compleja historia de deforma- ción. Por tanto, toda la estructura del anticlinal de Manzaneda puede ser in- terpretada en relación a la deformación Hercínica, ya que existe poca evi- dencia de tectónica Alpina.

[en] The Manzaneda anticline (Cabrera Alta, León) represents a N110ºE trending tectonic structure plunging towards the NW along the closure of the Truchas Sinclinorium. It is cored by quartzites (Ordovician) and affected by a complex joint network associated with quartz veins. Moreover, the anticline is cut by a thrust which uplifts the southern flank and slightly tilts it towards the SW. This fault is segmented along strike and cut by subsequent faults that displace it. The major structures in the area are covered by Tertiary sed- iments, indicating a Pre-Cenozoic age. In general, the cleavage imposed over the pelitic rocks is penetrative, characterized by a constant NW-SE striking axial-plane foliation. Such cleavage is modified by the presence of kinks and crenulations, indicating a complex deformational history. Furthermore, the overall structure of the Manzaneda antiform can be interpreted as being re- lated to the Hercynian deformation as there is little evidence of Alpine tec- tonics.

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Spain
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Keywords

Sinclinorio, Hercinian deformation, Anticlina, Ordovician Rocks., Ingeniería de minas, Deformación Hercínica, Ordovician rocks, Anticlinal, Anticline, Synclinorium, Hercinian Deformation, Rocas ordovícicas

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