skip to main content
Tipo de recurso Mostra resultados com: Mostra resultados com: Índice

Deformation mechanisms of deeply buried and surface-piercing Late Pre-Cambrian to Early Cambrian Ara Salt from interior Oman

Schoenherr, Johannes ; Schléder, Zsolt ; Urai, Janos ; Littke, Ralf ; Kukla, Peter

International Journal of Earth Sciences, 2010, Vol.99(5), pp.1007-1025 [Periódico revisado por pares]

Texto completo disponível

Citações Citado por
  • Título:
    Deformation mechanisms of deeply buried and surface-piercing Late Pre-Cambrian to Early Cambrian Ara Salt from interior Oman
  • Autor: Schoenherr, Johannes ; Schléder, Zsolt ; Urai, Janos ; Littke, Ralf ; Kukla, Peter
  • Assuntos: Salt diapirism ; Oman ; Recrystallisation ; Deformation mechanism ; Rock salt
  • É parte de: International Journal of Earth Sciences, 2010, Vol.99(5), pp.1007-1025
  • Descrição: We compared microstructures of Late Pre-Cambrian to Early Cambrian Ara Salt diapirs from the deep subsurface (3.5–5 km) of the South Oman Salt Basin and from surface-piercing salt domes of the Ghaba Salt Basin. Laterally, these basins are approximately 500 km apart but belong to the same tectono-sedimentary system. The excellent data situation from both wells and outcrops allows a unique quantification of formation and deformation mechanisms, spanning from sedimentation to deep burial, and via re-activated diapir rise to surface piercement. Microstructures of gamma-irradiated and etched thin sections indicate dislocation creep and fluid-assisted grain boundary migration as the main deformation mechanisms operating in the deep subsurface. Microstructures from the surface are characterised by large ‘old’ subgrain-rich crystals. These ‘old’ grains are partly replaced by ‘new’ subgrain-free and subgrain-poor crystals, which show gamma irradiation-decorated growth bands and fibrous microstructures, indicative of pressure solution creep and static recrystallisation, most likely due to surface piercement and exposure. Using subgrain size piezometry, the maximum differential stresses for the subsurface salt is 1.7 MPa and those for the surface-piercing salt is 3.4 MPa, the latter value displaying the high stress conditions in the diapir ‘stem’ as the salt rises on its way to the surface.
  • Idioma: Inglês

Buscando em bases de dados remotas. Favor aguardar.