Article

Facturación a distintas escalas y campos de esfuerzos durante la tectogenesis alpina en el área de Mosqueruela (Teruel)

Estudios Geologicos 01/1994;
Source: DOAJ

ABSTRACT The analysis of the brittle tectonic deformation on all scales in one area of the eastern Iberian Chain (Mosqueruela, Teruel) allows us to define a fracture pattern characterized by three main sets: NNE to NE, ENE and E to ESE. Brittle structures (stylolites, tension gashes, brittle-ductile shear zones and faults) show a poliphase Alpine tectonics. From the analysis of fault populations two compressive (wrench regime) phases and a multidirectional extension regime have been inferred. Their chronological evolution is the fol1owing: 1) ENE compression; 2) ESE compression; 3) nearly multidirectional NNE extension. The study of fractures using a number of methodologies at macro-, meso- and microstructural scales allows us to suggest a model of stress distribution and relationships between different structures in sorne areas. The detailed fracture mapping on a hectometric scale shows the distribution and strike variations of fractures. These changes have been interpreted as stress deflection phenomena due to major structures which, in many cases, were identified. Examples of stress deflections have been analyzed both for strike-slip and normal fault sets.

El análisis de la deformación tectónica frágil a distintas escalas en un sector de la Cordillera Ibérica oriental ha permitido definir el patrón de fracturación, caracterizado por tres familias principales de fracturas (NNE a NE, ENE YE a ESE). Las estructuras frágiles (estilolitos, juntas de extensión, zonas de cizalla semifrágil y, fundamentalmente, fallas) registran una tectónica alpina polifásica. Del análisis poblacional de las microfal1as se infieren dos campos de esfuerzos compresivos, principalmente en régimen de desgarre, de los cuales sólo el primero tiene reflejo a nivel macroestructural, y un estado distensivo en régimen de extensión radial o multidireccional. Las relaciones de corte observadas entre las ditintas estructuras ha mostrado la evolución temporal siguiente: 1) compresión ENE; 2) compresión ESE y 3) distensión NNE tendente a radial. El estudio de la fracturación mediante distintas metodologías adaptadas a la escala macro, meso y microestructural ha permitido establecer nexos de relación entre los resultados de todas ellas y poner de relieve la influencia que las estructuras mayores tienen en aquellas de menor rango. Así, la cartografía detallada de fracturas (fundamentalmente a escala mesoestructural) ha permitido observar variaciones en la distribución y orientación de las mismas. Tales variaciones han sido interpretadas como fenómenos de perturbación de esfuerzos por estructuras mayores que, en la mayoría de los casos, han podido ser identificadas. Se han estudiado ejemplos de estas perturbaciones en relación con familias de fallas tanto de desgarre como de componente normal.

0 Bookmarks
 · 
93 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: An analysis of Cenozoic brittle deformation in the European platform has been carried out between the Bohemian Massif to the east and the Western Mediterranean Sea to the west. A succession of four main paleostress fields has been defined: (1) N-;S compression of late Eocene age. This event induced the formation of the “German-Czech triangle,” bounded on the east by the NW-SE dextral strike-slip faults of Pfahl and Franconia and on the west by the NNE-SSW sinistral strike-slip faults along the axis of the future west European Rift, (2) E-W Oligocene extension that opened the west European Rift. (3) NE-SW compression, early Miocene in age, that reactivated the Pfahl fault line (as a reverse fault) and the main faults of the Rhinegraben (as dextral strike-slip faults). (4) Finally, since the end of the Miocene, a fan-shaped distribution of directions of compression has developed at the periphery of the Alpine arc. However, farther from the Alpine chain, a more consistent direction of compression has dominated (first NW-SE, then NNW-SSE). A comparison with plate tectonic data demonstrates that this succession of tectonic events is compatible with the reconstruction of relative movements between Africa and Eurasia during the Cenozoic collision. However, some local stress patterns, close to the Alps, are clearly related to the local evolution of the Alpine arc.
    Tectonics 01/1987; 6(2):99-132. · 3.49 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A method is proposed to compute some characteristics of a possible stress tensor related to striations measured in a given faulted area. If several tectonic phases are responsible for the striations the method separates and determines the successive stress tensors. The iterative algorithm consists of alternatively: (a) sorting the data attributed to a tectonic phase; and (b) computing the characteristics of the stress tensor of this phase. The method is tested using an application to synthetic and actual data.
    Journal of Structural Geology 01/1981; · 2.29 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: [EN] An aulacogen model is given for the Celtibenan Chain in Eastern Spain that undenvent a final strong deformation due to comprensive events that took place not only in its associated geosyncline, the Betic Cordillera, but also in some adjacents areas e. g. the Pyrenees. The identificationof the aulacogen is basedon the stratigraphic, volcanic and tectonic records and on its charactenstics as an intracontinental chain of intermediate type. [ES] Se establece la Cadena Celtibérica española como un aulacógeno que ha experimentado una deformación final enérgica debido a los fenómenos compresivos que tuvieronlugar no solo en el geosinclinal asociado, la Cordillera Bética, sino también en áreas adyacentes, los Pirineos. La identificación del aulacógeno se fundamenta mediante los registros estratigráficos, volcánicos y tectónicos, y en su carácter de cadena intracontinental, de tipo intermedio. Peer reviewed

Full-text (4 Sources)

View
10 Downloads
Available from
May 20, 2014