Structural Evolution of the Hawasina Window (Oman Mts) and its Relation to Hydrocarbon Generation

Csontos, László; Sasvári, Ágoston; Pocsai, Tamás; Árgyelán, Gizella B.; Dunkl, İstván; Fodor, László

doi:10.3997/2214-4609-pdb.246.114

Cited by 3 publications

(11 citation statements)

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“…Subsequent Europe‐Arabian plate collision flexed the overridden carbonate platform, which resulted in the formation of the Oman Mountains as we see them today (Loosveld et al, ). Structures related to late obduction or postobduction structures with dominant top‐to‐NNE movements and normal faulting are described for all three tectonic windows (Csontos et al, ; Fournier et al, ; Miller et al, ; Searle & Alsop, ). Related to their different positions with respect to the subduction zone, each window offers insights on different structural imprints on the overall tectonic history on the orogen: whereas the Saih Hatat window exposes high‐pressure metamorphic rocks, rocks in Jebel Akhdar are low grade metamorphic and include the less deformed passive margin sequence.…”

Section: Introductionmentioning

confidence: 99%

“…Related to their different positions with respect to the subduction zone, each window offers insights on different structural imprints on the overall tectonic history on the orogen: whereas the Saih Hatat window exposes high‐pressure metamorphic rocks, rocks in Jebel Akhdar are low grade metamorphic and include the less deformed passive margin sequence. The Hawasina window shows strongly deformed nappes of distal origin below the ophiolite (Csontos et al, ; Searle, ; Warren et al, ). However, how structures in the three tectonic windows correlate is not well known.…”

Section: Introductionmentioning

confidence: 99%

“…The westernmost and least studied tectonic window of the Oman Mountains is the Hawasina window (Figure a). The outcropping allochthonous units of the former Hawasina ocean show centroclinal strike of the regional cleavage, outlining a dome underneath that may be seen as a continuation of the Jebel Akhdar (Csontos et al, ). Detailed mapping indicates at least three repetitions of the nappe complex (Csontos et al, ; Searle, ).…”

Section: Introductionmentioning

confidence: 99%

“…The outcropping allochthonous units of the former Hawasina ocean show centroclinal strike of the regional cleavage, outlining a dome underneath that may be seen as a continuation of the Jebel Akhdar (Csontos et al, ). Detailed mapping indicates at least three repetitions of the nappe complex (Csontos et al, ; Searle, ). After thrusting, brittle‐ductile extension formed megaboudins of nappe units, initially stretching in N‐S, later in NE‐SW orientation.…”

Section: Introductionmentioning

confidence: 99%

“…After thrusting, brittle‐ductile extension formed megaboudins of nappe units, initially stretching in N‐S, later in NE‐SW orientation. Several subsequent folding phases including recumbent folding of earlier cleavage were interpreted to be related to top‐to‐NE to top‐to‐N shear and are associated with NE directed backthrusts (Csontos et al, ; Searle & Cooper, ). At the fringes of the tectonic window, steep normal faults cut the original nappe boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Multiphase Structural Evolution of a Continental Margin During Obduction Orogeny: Insights From the Jebel Akhdar Dome, Oman Mountains

et al. 2018

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The structural evolution of the carbonate platform in the footwall of the Semail ophiolite emplaced onto the passive continental margin of Arabia helps to better understand the early stages of obduction‐related orogens. These early stages are rarely observable in other orogens as they are mostly overprinted by later mountain building phases. We present an extensive structural analysis of the Jebel Akhdar anticline, the largest tectonic window of the Oman Mountains, and integrate it on different scales. Outcrop observations can be linked to plate motion data, providing an absolute timeframe for structural generations consistent with radiometric dating of veins. Top‐to‐S overthrusting of the Semail ophiolite and Hawasina nappes onto the carbonate platform during high plate convergence rates between Arabia and Eurasia caused rapid burial and overpressure, generation and migration of hydrocarbons, and bedding‐confined veins, but no major deformation in the carbonate platform. At reduced convergence rates, subsequent tectonic thinning of the ophiolite took place above a top‐to‐NNE, crustal‐scale ductile shear zone, deforming existing veins and forming a cleavage in clay‐rich layers in early Campanian times. Ongoing extension occurred along normal‐ to oblique‐slip faults, forming horst‐graben structures and a precursor of the Jebel Akhdar dome (Campanian to Maastrichtian). This was followed by NE‐SW oriented ductile shortening and the formation of the Jebel Akhdar dome, deforming the earlier structures. Thereafter, exhumation was associated with low‐angle normal faults on the northern flank of the anticline. We correlate the top‐to‐NNE crustal‐scale shear zone with a similar structure in the Saih Hatat window to develop a unified model of the tectonic evolution of the Oman Mountains.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiphase Structural Evolution of a Continental Margin During Obduction Orogeny: Insights From the Jebel Akhdar Dome, Oman Mountains

et al. 2018

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Structure of the Offshore Obducted Oman Margin: Emplacement of Semail Ophiolite and Role of Tectonic Inheritance

et al. 2021

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Texture and Shape Analysis of Quartzite Mylonites of the Metamorphic Sole of the Samail Ophiolite (Oman): Evidence for Syn- and Post-Obduction Deformation

Hallas

Bauer

2021

Geosciences

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The metamorphic sole, tectonically welded to the base of the Samail ophiolite in a supra-subduction system, is assumed to play the main role in strain accumulation during later thrusting onto the Arabian Plate (i.e., during obduction). The present study deals with five quartzite samples representative of the upper amphibolite and lower greenschist facies parts of the sole. Whole-rock textures obtained by neutron time-of-flight technique were coupled with microstructural observation using electron backscatter diffraction analyses. The quartz microstructural fabrics and textures in the upper and lower parts of the sole represent grain boundary migration and [c]-in-Y textures and subgrain rotation recrystallization and {r}-in-Z textures, respectively. The shear sense in these samples points to top-to-the-SW to SSW shear. One sample of the upper part, yielding a higher calcite amount, is later overprinted by bulging and displays top-to-the-NNE shear. We postulate to differentiate two main deformation steps. The first is the overall present subgrain rotation and grain boundary migration recrystallization combined to top ~SW shear is related to the sole accretion to the ophiolite and the eventually following thrusting onto the Arabian Plate. The second is correlated to a post-obduction extensional top-to-the-NNE shearing, which is associated with tectonic thinning of the ophiolite and mainly documented in the underlying autochthonous units.

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Structural Evolution of the Hawasina Window (Oman Mts) and its Relation to Hydrocarbon Generation

Cited by 3 publications

References 0 publications

Multiphase Structural Evolution of a Continental Margin During Obduction Orogeny: Insights From the Jebel Akhdar Dome, Oman Mountains

Multiphase Structural Evolution of a Continental Margin During Obduction Orogeny: Insights From the Jebel Akhdar Dome, Oman Mountains

Structure of the Offshore Obducted Oman Margin: Emplacement of Semail Ophiolite and Role of Tectonic Inheritance

Texture and Shape Analysis of Quartzite Mylonites of the Metamorphic Sole of the Samail Ophiolite (Oman): Evidence for Syn- and Post-Obduction Deformation

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