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• W86967662 abstract "The Saih Hatat tectonic window, situated in the eastern part of the Oman mountains, exposes HP/LT units that are associated with subduction of the continental margin or a microplate. The polarity and timing of this subduction is highly debated. The plural km-scale ENE – WSW trending Wadi Kabir fault (WKF) is situated along the northern edge of Saih Hatat, to the east of Muscat, where it juxtaposes the mantle sequence of the Samail ophiolite against >7 kbar metamorphosed Triassic shelf carbonates. Obduction of the Samail ophiolite and associated thrust sheets towards the SW onto the NE Oman margin commenced during the Turonian, contemporaneous with bulging and erosion of the autochthonous shelf carbonates. The Wadi Kabir fault acted as one of the major thrusts accommodating this obduction. The km-scale Wadi Kabir syncline (WKS) is overlying the mantle sequence harzburgites to the north of the Wadi Kabir fault, and consists of neo-autochthonous, post-obduction limestones and conglomerates, the age of which is at yet poorly constraint. The elevated peneplain to the south of the Wadi Kabir fault comprises neo-autochthonous, south-dipping limestones. They unconformably overlie the north-dipping Triassic shelf carbonates, from which they are separated by a tectonic melange. This research mainly deals with the evolution of the Wadi Kabir area after obduction of the ophiolite, which is subsequently mirrored against the evolution of adjacent neo-autochthonous basins and the northern Saih Hatat region. The basis for this research is formed by a detailed geological mapping exercise, which yielded stratigraphic columns, a geological map and structural profiles. Thin sections obtained at key stratigraphic intervals were analyzed for their fossil and mineral content. Movement vectors and sense from dragging features on shear bands, striations and slickenfibers on fault planes along the Wadi Kabir fault and on the tectonic melange overlying the elevated peneplain were obtained. They are analyzed using stress inversion software, in order to obtain the stress regimes active throughout the evolution of the area and their relative timing. During the exhumation stage the mantle sequence of the Samail ophiolite and associated thrust sheets was downfaulted towards the north, with the creation of ductile shear bands with top-to-N(E) extensional fabrics. This extensional regime continued into the Paleocene when the rocks entered the brittle domain, with motion over the WKF allowing hydrothermal alteration of the serpentinized mantle rocks to type I listwanites, and creation of a palaeo-topography. Sedimentation over the mantle sequence commenced during the Thanetian, during which the area was still subject to an (E)NE –(W)SW directed extensional regime as attested by NW – SE trending syn-sedimentary normal faults. These sediments are part of the Jafnayn and Rusayl formations, which were deposited in lagoonal to shallow-shelf environments. Extension ceased during the Ypresian, and was followed by thermal subsidence of Saih Hatat.…" @default.
• W86967662 created "2016-06-24" @default.
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• W86967662 date "2013-08-26" @default.
• W86967662 modified "2023-09-24" @default.
• W86967662 title "Post-obduction evolution of the Wadi Kabir syncline area and northern Saih Hatat, Oman" @default.
• W86967662 hasPublicationYear "2013" @default.
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