Structural and AMS study of a Miocene dyke swarm located above the Patagonian subduction

J. P. Lefort, T. Aïfa, F. Hervé

Resultado de la investigación: Contribución a los tipos de informe/libroContribución a la conferenciarevisión exhaustiva

11 Citas (Scopus)

Resumen

The Miocene doleritic dyke swarm, located above the subduction of the Pacific ocean in Southern Patagonia (Chile), shows a complex orientation pattern. However, if we consider: (1) the fault directions, (2) the orientations of the dykes, (3) the large transcurrent shear zones, (4) the Miocene azimuth of subduction, (5) the shape of the Taitao Peninsula, (6) the dextral and sinistral transtensions, and (7) the direction and age of the offshore graben and onshore thrusts, a general kinematic model can be proposed. This model is based on a physical indentation experiment characterized by a weak confinement on one of its edges. Study of the shallow AMS tensors shows that the magnetic minerals located at the edges of many dykes also witness an oblique opening. We postulate that the strong acceleration of the subduction during Miocene time changed the dip of this subduction, modified the superficial stress field and acted like a large indenter.

Idioma originalInglés
Título de la publicación alojadaDyke Swarms - Time Markers of Crustal Evolution - Proceedings of the 5th International Conference, IDC-5
Páginas225-241
Número de páginas17
EstadoPublicada - 2006
Evento5th International Dyke Conference: Dyke Swarms - Time Markers of Crustal Evolution, IDC-5 - Rovaniemi, Finlandia
Duración: 31 jul 20053 ago 2005

Otros

Otros5th International Dyke Conference: Dyke Swarms - Time Markers of Crustal Evolution, IDC-5
País/TerritorioFinlandia
CiudadRovaniemi
Período31/07/053/08/05

Áreas temáticas de ASJC Scopus

  • Geoquímica y petrología
  • Ingeniería geotécnica y geológica

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