Tectonic evolution of the Oman Mountains: an introduction

Rollinson, Hugh; Searle, Mike; Abbasi, İftikhar Ahmed; Al-Lazki, Ali; Kindi, Mohammed Hilal Al

doi:10.1144/sp392.1

Cited by 31 publications

(26 citation statements)

References 24 publications

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“…Large basement-cored antiformal domes at Jabal Akhdar, Nakhl, and Saih Hatat ( Fig. 1) formed during this Late Cretaceous tectonism, either above basement ramps from deep duplexing, or propagation of blind thrusts (Rollinson et al, 2014;Al-Lazki et al, 2002;Hanna, 1986). This ophiolite-emplacement related deformation ended by the Late Campanian (Glennie, 2005) and was followed by Late Cretaceous-Early Tertiary shallow marine conditions.…”

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confidence: 99%

“…Map showing the tectonic setting of the northern Oman margin (modified after Kusky et al, 2005 andBoote et al, 1990). sedimentation in the Aruma foreland basin (Rollinson et al, 2014); Glennie, 2005;Robertson, 1987;Glennie et al, 1973). Emplacement of the ophiolite caused strong deformation of the shelf sediments of the Hajar Group along with the oceanic and continental slope sediments of the Hawasinaa and Sumeini Groups and formed a thin dynamothermal aureole (Rollinson et al, 2014, and chapters therein).…”

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confidence: 99%

“…Emplacement of the ophiolite caused strong deformation of the shelf sediments of the Hajar Group along with the oceanic and continental slope sediments of the Hawasinaa and Sumeini Groups and formed a thin dynamothermal aureole (Rollinson et al, 2014, and chapters therein). Large basement-cored antiformal domes at Jabal Akhdar, Nakhl, and Saih Hatat ( Fig.…”

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Tertiary and quaternary marine terraces and planation surfaces of northern Oman: Interaction of flexural bulge migration associated with the Arabian-Eurasian collision and eustatic sea level changes

2016

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The northeastern Arabian passive margin is being subducted beneath the Zagros and Makran of Iran. A flexural bulge related to the weight of the Makran has migrated at 4 cm/a through the previously uplifted Hajar Mountains of Oman as this active convergence and collision between Arabia and Eurasia progresses, adding approximately another 500 meters of relief, and forming a series of uplifted marine terraces, alluvial terraces, and planation surfaces that record the passage of the bulge. We use a combination of field studies, remote sensing and GIS to map and better-understand these terraces, and elucidate how the tectonics of bulge migration, down-to-trench normal faulting, and eustatic sea level changes have interacted to produce the extant geomorphic features on the inner slope of the flexural bulge as it sinks into the foredeep of the Gulf of Oman. We speculate those terraces that were uplifted on the outer slope of the forebulge as it initially migrated through the passive margin (affected by ophiolite obduction in the Cretaceous) 3.75-7.5 Ma ago are now sinking on the inner slope of the forebulge (corresponding to the outer trench slope in the foredeep), and have been partly covered by Quaternary marine terraces related to a Weichselian sea level high stand. Both the Tertiary and Quaternary terraces are cut by faults related to the active collision, confirming that there is a significant risk of moderate earthquakes in the region. KEY WORDS: marine terraces, flexural bulge, Arabia-Eurasia collision, Sultanate of Oman, remote sensing, image processing, Quaternary sea level fluctuation.

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Tertiary and quaternary marine terraces and planation surfaces of northern Oman: Interaction of flexural bulge migration associated with the Arabian-Eurasian collision and eustatic sea level changes

2016

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“…24). Geologically, the Al Hajar are comprised predominantly of the ophiolite complex (Cretaceous limestone of Oligocene and Miocene age) (Rollinson et al 2014). Due to their higher elevation, these mountains receive 150-350 mm annual precipitation (Fisher & Membery 1998), considerably greater than the arid peneplain that surrounds them.…”

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confidence: 99%

A new species of Alhajarmyia Stuckenberg (Diptera: Vermileonidae), the first wormlion fly described from East Africa and its biogeographical implications

Swart

Kirk-Spriggs

Copeland

2015

Zootaxa

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A second species of the genus Alhajarmyia Stuckenberg (A. stuckenbergi Swart, Kirk-Spriggs & Copeland, sp. n.), is described and figured, from the Eastern Arc Mountains of Kenya (Kasigau Mountain and Taita Hills), being the first vermileonid recorded from East Africa. The species is shown to differ from its congener, A. umbraticola (Stuckenberg & Fisher), described from Oman in the Arabian Peninsula, based on external characters including male and female terminalia. An identification key is provided together with distribution maps for the two species, and biogeographical aspects are discussed.

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“…The laterites of the Oman Mountains belong to the Qahlah Formation that lies unconformably on the obducted Semail ophiolite (96.4 Ma.) [13,18] and grades into the Late Campanian-Maastrichtian Simsima Formation. The Qahlah Formation represents the most basal, post-obduction terrigenous clastic facies in Oman [14] and mainly contains conglomerate, sandstone, and siltstone [19].…”

Section: Geological Backgroundmentioning

confidence: 99%

Mobilization and Redistribution of Elements in Laterites of Semail Ophiolite, Oman: A Mass Balance Study

Khirbash

Semhi

2015

SQU Journal for Science

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Several samples of laterites were collected from four paleosol profiles, Ibra, East Ibra, Al-Russayl, and Tiwi representing the vertical lithological variation within each profile. The mineralogical and geochemical composition of laterites in every section revealed differences in thickness and redistribution of elements reflecting different conditions of weathering processes. Elemental mass balance was calculated for every profile relative to the parent rock. The results indicated redistribution of elements from the surface to deeper zones with an enrichment of elements in the saprolite and oxide zones. Among the different sections, the profile of East Ibra composite 1 and 2 is characterized by high concentration of all elements compared to the other profiles. Sc/Fe ratio in different zones indicates low values for the profile of Tiwi profile 1, Ibra profile and Al-Russayl composite 2 and 3 profile due to the significant enrichment of Fe in these zones independently of redox conditions. Large fluctuations characterize Th/U ratios and reflect redox condition more reduced in Tiwi area than in East Ibra and Al-Russayl areas.

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Tectonic evolution of the Oman Mountains: an introduction

Cited by 31 publications

References 24 publications

Tertiary and quaternary marine terraces and planation surfaces of northern Oman: Interaction of flexural bulge migration associated with the Arabian-Eurasian collision and eustatic sea level changes

Tertiary and quaternary marine terraces and planation surfaces of northern Oman: Interaction of flexural bulge migration associated with the Arabian-Eurasian collision and eustatic sea level changes

A new species of Alhajarmyia Stuckenberg (Diptera: Vermileonidae), the first wormlion fly described from East Africa and its biogeographical implications

Mobilization and Redistribution of Elements in Laterites of Semail Ophiolite, Oman: A Mass Balance Study

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