Review of the long-term coastal evolution of North Oman - subsidence versus uplift

Hoffmann, Gösta; Rupprechter, M.; Mayrhofer, Christoph

doi:10.1127/1860-1804/2013/0002

Cited by 12 publications

(7 citation statements)

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“…Alluvial fans and terraces, within the mountain wadis, have been explained as the result of fluvial processes caused by a change from a humid to arid climate during the late Pleistocene resulting in terrace incision (Abrams & Chadwick, ). The Batinah coast, adjacent to the Jabal Akhdar culmination, shows no present‐day vertical movement, and the area is reported to be tectonically stable (Hoffmann et al, ).…”

Section: Settingmentioning

confidence: 99%

Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low‐Temperature Thermochronology

et al. 2017

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Uplift of the Al Hajar Mountains in Oman has been related to either Late Cretaceous ophiolite obduction or the Neogene Zagros collision. To test these hypotheses, the cooling of the central Al Hajar Mountains is constrained by 10 apatite (U‐Th)/He (AHe), 15 fission track (AFT), and four zircon (U‐Th)/He (ZHe) sample ages. These data show differential cooling between the two major structural culminations of the mountains. In the 3 km high Jabal Akhdar culmination AHe single‐grain ages range between 39 ± 2 Ma and 10 ± 1 Ma (2σ errors), AFT ages range from 51 ± 8 Ma to 32 ± 4 Ma, and ZHe single‐grain ages range from 62 ± 3 Ma to 39 ± 2 Ma. In the 2 km high Saih Hatat culmination AHe ages range from 26 ± 4 to 12 ± 4 Ma, AFT ages from 73 ± 19 Ma to 57 ± 8 Ma, and ZHe single‐grain ages from 81 ± 4 Ma to 58 ± 3 Ma. Thermal modeling demonstrates that cooling associated with uplift and erosion initiated at 40 Ma, indicating that uplift occurred 30 Myr after ophiolite obduction and at least 10 Myr before the Zagros collision. Therefore, this uplift cannot be related to either event. We propose that crustal thickening supporting the topography of the Al Hajar Mountains was caused by a slowdown of Makran subduction and that north Oman took up the residual fraction of N‐S convergence between Arabia and Eurasia.

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Section: Settingmentioning

confidence: 99%

Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low‐Temperature Thermochronology

et al. 2017

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“…Figure 1a also shows the current tectonic situation at the northeastern margin of the Arabian Plate. Quaternary deformation in the Al Hajar Mountains is reflected by faults cutting through Quaternary wadi gravel (Kusky et al, 2005), hydrothermal activity on the northern margins of the Jabal Akhdar and Saih Hatat domes (Mattern and Scharf, 2018), and formation of coastal terraces between Muscat and Sur near Tiwi (Kusky et al, 2005; Hoffmann et al, 2013; Yuan et al, 2016; Al Hatrushi 2017).…”

Section: Geological and Tectonics History Of The Al Hajar Mountainsmentioning

confidence: 99%

“…The marine terraces have been identified and described in the course of geological mapping (Le Métour et al, 1986; Wyns et al, 1992a, 1992b). While the first relative dating attempt (Pliocene and later) was made by Wyns et al (1992a), the most recent works on these terraces identify them in terms of landscape characteristics and support the understanding of their marine origin (Kusky et al, 2005; Hoffman et al, 2013; Yuan et al, 2016; Mattern et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Neogene to Quaternary uplift history along the passive margin of the northeastern Arabian Peninsula, eastern Al Hajar Mountains, Oman

et al. 2018

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This work explores the uplift history of the best exposed marine terraces in the northeastern Arabian Peninsula (eastern Al Hajar Mountains). A multidisciplinary approach was employed, including a topographic survey, 14C dating, thin section studies, and scanning electron microscopy analyses. Six distinctive marine terraces with widths ranging from tenth of meters to kilometers and elevations from 5 to ~400 m were studied. These terraces record an along-strike heterogeneous uplift history, while they show temporally variable uplift rates ranging between 0.9 to 6.7 mm/yr, which correlates well with other published uplift rates of marine terraces of the eastern Arabian Peninsula. We attribute the variable uplift along strike of the terraces, to a combination of uplift mechanisms: (1) during early to mid-Miocene along deep-rooted reverse faults that bound large crustal-scale blocks, (2) Pliocene or post-Pliocene uplift on the outer wall of the forebulge of the lower Arabian Plate as it bends to enter the Zagros-Makran subduction zone, and (3) a possible slowdown of subduction for the past ~40 ka.

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“…Future projections of regional relative sea-level rise for the RSA are also constrained by this lack of tidal gauge time-series data and by the complexity of isostatic land movements. Sections of the coastline along the western shores of the M-RSA and O-RSA are rising due to isostatic rebound, and therefore for these areas the relative sea-level rise may be lower than the estimated global average [38,39]. Recent estimates of end-of-century future global mean sea-level rise under RCP8.5 give a likely range of 0.6-1.1 m, with a median value of 0.8 m [36].…”

Section: Sea Level and Ocean Circulationmentioning

confidence: 99%

A Regional Review of Marine and Coastal Impacts of Climate Change on the ROPME Sea Area

et al. 2021

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The Regional Organization for the Protection of the Marine Environment (ROPME) Sea Area (RSA) in the northern Indian Ocean, which comprises the Gulf, the Gulf of Oman and the northern Arabian Sea, already experiences naturally extreme environmental conditions and incorporates one of the world’s warmest seas. There is growing evidence that climate change is already affecting the environmental conditions of the RSA, in areas including sea temperature, salinity, dissolved oxygen, pH, and sea level, which are set to continue changing over time. The cumulative impacts of these changes on coastal and marine ecosystems and dependent societies are less well documented, but are likely to be significant, especially in the context of other human stressors. This review represents the first regional synthesis of observed and predicted climate change impacts on marine and coastal ecosystems across the ROPME Sea Area and their implications for dependent societies. Climate-driven ecological changes include loss of coral reefs due to bleaching and the decline of fish populations, while socio-economic impacts include physical impacts from sea-level rise and cyclones, risk to commercial wild capture fisheries, disruption to desalination systems and loss of tourism. The compilation of this review is aimed to support the development of targeted adaptation actions and to direct future research within the RSA.

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Review of the long-term coastal evolution of North Oman - subsidence versus uplift

Cited by 12 publications

References 0 publications

Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low‐Temperature Thermochronology

Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low‐Temperature Thermochronology

Neogene to Quaternary uplift history along the passive margin of the northeastern Arabian Peninsula, eastern Al Hajar Mountains, Oman

A Regional Review of Marine and Coastal Impacts of Climate Change on the ROPME Sea Area

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