Forward Kinematic Modelling of a Regional Transect in the Northern Emirates Using Geological and Apatite Fission Track Age Constraints on Paleo-Burial History

Tărăpoancă, M.; Andriessen, P.A.M.; Broto, Karine; Cherel, L.; Ellouz-Zimmermann, Nadine; Faure, Jean-Luc; Jardin, Anne; Naville, Charles; Roure, François

doi:10.1007/978-3-642-30609-9_8

Cited by 15 publications

(49 citation statements)

References 14 publications

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“…Other thrusts imaged on the seismic sections cut through the subophiolite sheets and the shelf carbonates, but it is uncertain if these are late-stage ophiolite emplacement-related Late Cretaceous thrusts or mid-Cenozoic (Musandam type) thrusts associated with the initial continental collision. The east-dipping normal fault bounding the southeast margin of Musandam and the northwest margin of the Dibba zone (Searle, 1988a(Searle, , 1988bSearle et al, 2014) is shown clearly in the interpretative sections of Tarapoanca et al (2010;Fig. 4).…”

Section: Deep Seismic Constraints From the Uaementioning

confidence: 97%

“…We use our structural mapping constraints to restore the Bani Hamid thrust sheet in relation to the known geometry of the Semail ophiolite thrust sheet and present a tectonic evolution based on our new data combined with U-Pb timing constraints (Styles et al, 2006;Rioux et al, 2012aRioux et al, , 2013. We speculate on the composition and structure of the lower crust as imaged on recently acquired deep seismic profiles across the mountains in northern Oman and the UAE (Rouré et al, 2006;Tarapoanca et al, 2010;Naville et al, 2010). We integrate geological constraints from the northeastern Oman mountains where high-pressure eclogites have been exhumed east of Muscat (As Sifah eclogites; Searle et al, 1994Searle et al, , 2004Warren et al, 2003;Agard et al, 2010), and from the northern mountains where the Bani Hamid granulites crop out, to formulate a model for ophiolite obduction and emplacement.…”

Section: Introductionmentioning

confidence: 92%

“…Four deep seismic profiles were shot by WesternGeco (2005) on behalf of the Ministry of Energy of the UAE and preliminary results were presented by Batty et al (2004), Tarapoanca et al (2010), and Naville et al (2010). In addition, a new aeromagnetic survey in the UAE was carried out by Fugro (Batty et al, 2004;Styles et al, 2006).…”

Section: Deep Seismic Constraints From the Uaementioning

confidence: 99%

“…The north-south D2 profile through the Masafi window shows a thick sedimentary pile below the ophiolite, but it was not possible to distinguish the shelf carbonate units from the Sumeini and Hawasina thrust sheets . Tarapoanca et al (2010) showed thrust stacks cutting through the Permian-Cretaceous shelf carbonate on a trend south of the Musandam culmination. Combined with exposed geology in the UAE and Oman parts of Musandam, these thrusts are known to affect the pre-Permian basement, Permian-Mesozoic shelf carbonates, the Late Cretaceous foreland basin, and the Paleogene sedimentary cover.…”

Section: Deep Seismic Constraints From the Uaementioning

confidence: 99%

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Structure and metamorphism beneath the obducting Oman ophiolite: Evidence from the Bani Hamid granulites, northern Oman mountains

et al. 2015

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The Cretaceous Semail ophiolite (northern Oman and the United ArabEmirates) includes an intact thrust slice of Tethyan oceanic crust and upper mantle formed above a northeast-dipping subduction zone that was the site of initiation of obduction. The normal metamorphic sole of the Semail ophiolite comprises a highly condensed sequence of hornblende + plagioclase ± garnet amphibolites with small enclaves of garnet + clinopyroxene granulites immediately beneath the mantle sequence peridotites, tectonically underlain by a series of epidote amphibolite and greenschist facies lithologies in a highly deformed ductile shear zone. Peak metamorphic conditions of 770-900 °C and 11-15 kbar indicate metamorphism at depths far greater than can be accounted for by the preserved thickness of the ophiolite (~15 km). In the mountains of northern Oman, the 1.2-km-thick Bani Hamid thrust sheet is composed of intensely folded granulite and amphibolite facies rocks within mantle sequence peridotites, exhumed by late-stage out-of-sequence thrusting along the Bani Hamid thrust. The Bani Hamid thrust slice includes two-pyroxene quartzites (± hornblende, cordierite, sapphirine), diopside + andradite garnet + wollastonite + scapolite marbles and calc-silicates and amphibolites (hornblende + plagioclase ± clinopyroxene ± biotite) with localized partial melting, intruded by hornblende pegmatites. The Bani Hamid granulites represent metamorphosed cherts and calcareous turbidites probably derived from the distal Haybi Complex and Oman Exotic limestones, which have an alkali basaltic substrate. Metamorphic modeling using the program THERMOCALC in the system NCKFMASHTO (Na 2 O-CaO-K 2 O-FeO-MgO-Al 2 O 3 -SiO 2 -H 2 O-TiO 2 -O)gives peak pressure-temperature conditions of 850 ± 60 °C and 6.3 ± 0.5 kbar, a pressure that is much lower than that of the metamorphic sole, suggesting a different origin. The 206 Pb/ 238 U zircon dates indicate that the gabbroic crust of the ophiolite formed by ridge magmatism from before 96.1 to 95.5 Ma. The 206 Pb/ 238 U zircon dates from the metamorphic sole range from 95.7 to 94.5 Ma, and suggest that metamorphism and melting was either synchronous with or slightly postdated ridge magmatism. The Bani Hamid granulites are younger; zircon and titanite U-Pb dates span ca. 94.5-89.8 Ma. Peraluminous granitic dikes intruding the mantle sequence peridotites are as young as 91.4 Ma and likely reflect localized partial melting of crustal material during the late stage of the obduction process. A minimum of 130 km shortening is recorded by restoration of the major folds within the Bani Hamid thrust sheet, and more than 30 km offset has occurred along the west-directed breaching out-of-sequence Bani Hamid thrust. These rocks may be representative of deep-level duplexes imaged on recent seismic sections across the mountains of northern Oman-United Arab Emirates.

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Section: Deep Seismic Constraints From the Uaementioning

confidence: 97%

Section: Introductionmentioning

confidence: 92%

Section: Deep Seismic Constraints From the Uaementioning

confidence: 99%

Section: Deep Seismic Constraints From the Uaementioning

confidence: 99%

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Structure and metamorphism beneath the obducting Oman ophiolite: Evidence from the Bani Hamid granulites, northern Oman mountains

et al. 2015

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“…9) shows deep-seated high-angle thrusts that can be traced down into the Mesozoic platform sequence which have restacked the platform and overlying Suneinah and Pabdeh foredeep deposits with a westward sense of movement. These increases in intensity to the north towards the Musandam culmination, where they involve thick-skinned imbrication of the whole of the shelf sequence (Dunne et al 1990;Tarapoanca et al 2010), die out to the south and are absent from the Jabal Qumayrah profile (Fig. 10).…”

Section: Post-emplacement Latest Cretaceous and Cenozoic Overprintingmentioning

confidence: 99%

Structure of the northern Oman Mountains from the Semail Ophiolite to the Foreland Basin

Cooper

Ali

Searle

2014

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The northern Oman Mountains record the Late Cretaceous emplacement of the Semail Ophiolite and associated subduction trench and deeper-water sediments into a foredeep on the downwarped Arabian continental margin. In-sequence piggy-back thrusting was modified by later thrust sheets of Permian-Mesozoic continental slope sediments that breached the overlying allochthonous stack. Sections through these culminations show asymmetries linked to deep-seated faults perpendicular to the margin edge which created offsets (promontories) that influenced detachment. Seismic profiles across the foredeep indicate an unconformity at the top of the Mesozoic carbonate platform, the product of early flexural uplift, onlapped by sediments. A second onlap phase is linked with rapid subsidence during final emplacement of the allochthon. Passive margin conditions resumed during Maastrichtian time, conformable along the axis of the foredeep. A Paleocene-Eocene (Pabdeh) foredeep was initiated in the northern mountains, recorded on seismic profiles with another onlapping sequence. Subsidence and infill persisted into the Oligocene when compression, linked with the Zagros collision, resulted in uplift and en echelon folding, probably due to the reactivation of deep-seated faults. Post-Miocene erosion of one culmination exposed the cap of a gypsum/anhydrite intrusion. The origin remains uncertain, but derivation from the Neoproterozoic to Cambrian Ara Group salt is preferred.

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Complex fault-fold interactions during the growth of the Jabal Qusaybah anticline at the western tip of the Salakh Arch, Oman

et al. 2015

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The Jabal Qusaybah anticline is located at the western end of the Salakh Arch, a major salient in the foothills of the Oman Mountains. We performed a structural and petrographical-geochemical study of vein sets and fault zones associated with the development of this anticline. Our data illustrate a complex deformation pattern both in space and time, characterized by the unusual presence of widespread NE-SW left-lateral strike-slip fault zones trending oblique to the E-W fold axial strike, and of abundant and well-developed N-S fold-perpendicular extensional fault zones associated with axial bulging and dilation, well developed in the central region of the anticlinal crest. We propose a three-stage evolution for the Jabal Qusaybah anticline, starting with prefolding jointing in the foreland of the late Cretaceous Oman Mountains, and followed by development of extensional faulting in Campanian times. Positive inversion of the Qusaybah Fault, possibly in Miocene times, caused development of a layer-parallel shortening fabric and amplification the Jabal Qusaybah Anticline, in concomitance with the activity of NE-SW left-lateral strike-slip fault zones that triggered N-S, fold-perpendicular extensional faulting, particularly in the axial bump of the anticline. The final evolutionary stage was characterized by further amplification of the axial bump and related N-S extensional fracturing and by uplift and exhumation. To explain the complex noncylindrical fault-fold interactions in the study anticline, we tentatively propose that they were triggered by near foredeep-parallel tapering of the sedimentary/tectonic overburden of the Ara evaporites.

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Forward Kinematic Modelling of a Regional Transect in the Northern Emirates Using Geological and Apatite Fission Track Age Constraints on Paleo-Burial History

Cited by 15 publications

References 14 publications

Structure and metamorphism beneath the obducting Oman ophiolite: Evidence from the Bani Hamid granulites, northern Oman mountains

Structure and metamorphism beneath the obducting Oman ophiolite: Evidence from the Bani Hamid granulites, northern Oman mountains

Structure of the northern Oman Mountains from the Semail Ophiolite to the Foreland Basin

Complex fault-fold interactions during the growth of the Jabal Qusaybah anticline at the western tip of the Salakh Arch, Oman

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