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2018-02-01

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/132478

Jurassic rifting to post-rift subsidence analysis in the Central High Atlas and its relation to salt diapirism

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https://doi.org/10.1111/bre.12223

Resum

The subsidence evolution of the Tethyan Moroccan Atlas Basin, presently inverted as the Central High Atlas, is characterized by an Early Jurassic rifting episode, synchronous with salt diapirism of the Triassic evaporite-bearing rocks. Two contrasting regions of the rift basin - with and without salt diapirism - are examined to assess the effect of salt tectonics in the evolution of subsidence patterns and stratigraphy. The Djebel Bou Dahar platform to basin system, located in the southern margin of the Atlas Basin, shows a Lower Jurassic record of normal faulting and lacks any evidence of salt diapirism. In contrast, the Tazoult ridge and adjacent Amezra¿ı basin, located in the centre of the Atlas Basin, reveals spectacular Early Jurassic diapirism. In addition, we analyse alternative Central High Atlas post-Middle Jurassic geohistories based on new thermal and burial models (GENEX 4.0.3 software), constrained by new vitrinite reflectance data from the Amezra¿ı basin. The comparison of the new subsidence curves from the studied areas with published subsidence curves from the Moroccan Atlas, the Saharan Atlas (Algeria) and Tunisian Atlas show that fast subsidence peaks were diachronous along the strike, being younger towards the east from Early-Middle Jurassic to Late Cretaceous. This analysis also evidences a close relationship between these high subsidence rate episodes and salt diapirism.

Matèries

Gran Atles (Marroc : Serralada), Juràssic, Geologia estructural

Matèries (anglès)

High Atlas Mountains (Morocco), Jurassic Period, Structural geology

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Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

Citació

MORAGAS RODRIGUEZ, Mar, et al. Jurassic rifting to post-rift subsidence analysis in the Central High Atlas and its relation to salt diapirism. Basin Research. 2018. Vol. 30, num. 51, pags. 336-362. ISSN 0950-091X. [consulted: 3 of August of 2026]. Available at: https://hdl.handle.net/2445/132478

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