Ophiolite Geology and Tectonic Processes in the Oman Mountains

The Oman Mountains host the Samail Ophiolite, the world’s most complete section of oceanic crust and upper mantle emplaced onto a continental margin. Formed in the mid-Cretaceous as part of the Neo-Tethys system, this ophiolite records processes of oceanic lithosphere generation, subduction initiation and obduction onto the Arabian passive margin. Beneath the ophiolite lies a structurally complex nappe stack and metamorphic sole, preserving both high-temperature and high-pressure fabrics that testify to early subduction dynamics. Subsequent Arabia–Eurasia convergence during the Cenozoic reactivated deep-seated structures and generated foreland basins, fold-and-thrust belts and fault zones, such as the Semail Gap, which controls mantle flow and magma pathways. The region also furnishes a suite of volcanogenic massive sulphide deposits, offering a window on ore formation at proto-arc settings, while its buried sedimentary basins hold potential for geothermal and groundwater resources. As a natural laboratory, the Oman Mountains continue to refine global models of ophiolite architecture, subduction processes and continental collision, with implications ranging from mineral exploration to the mechanics of plate-boundary evolution.

Research from Nature Portfolio

High-resolution geophysical imaging has delineated the three-dimensional architecture of the ophiolite, revealing an east-dipping, >15 km thick high-velocity body that flexed the underlying continental margin and defined the offshore suture. This model clarifies the limits of the obducted oceanic lithosphere and its role in foreland basin subsidence. In parallel, U–Pb dating of syn-kinematic carbonate veins in the Jabal Hafeet anticline constrains late Cenozoic deformation between c.20 Ma and 2 Ma, linked to far-field stress propagation from the Makran and Zagros belts. Raman fluid-inclusion geochemistry further demonstrates complex hydrocarbon-bearing fluids migrating along reactivated structures. Together, these studies integrate crustal structure and fracture chronology to explain how Arabian–Eurasian convergence reshaped both the ophiolite and its foreland basin.

Ophiolite Geology and Tectonic Processes in the Oman Mountains publication trend

The graph below shows the total number of articles in ophiolite geology and tectonic processes in the oman mountains across all publications each year (not limited to Nature Index journals).

Technical terms

Ophiolite: A section of oceanic crust and upper mantle thrust onto continental lithosphere during obduction.

Metamorphic sole: A thin high-temperature metamorphic layer developed beneath an ophiolite during initial subduction.

Subduction zone: A convergent plate margin where oceanic lithosphere sinks beneath another plate into the mantle.

Foreland basin: A sedimentary basin that forms adjacent to a mountain belt due to lithospheric loading and flexure.

Boninite: A high-magnesium, low-titanium volcanic rock typically associated with early subduction-related magmatism.

References

1. The Samail subduction zone dilemma: Geochronology of high-pressure rocks from the Saih Hatat window, Oman, reveals juxtaposition of two subduction zones with contrasting thermal histories. Earth-Science Reviews (2024).
2. Contrasting Features and Volcanostratigraphy of the Mafic-Hosted Mandoos and Shinas Volcanogenic Massive Sulfide Deposits, Samail Ophiolite, Oman. Economic Geology (2023).
3. The influence of Cenozoic Eurasia-Arabia convergence on the Southeast Arabian Foreland Basin: new geochronological and geochemical constraints from syn-kinematic carbonate mineralization. Scientific Reports (2023).
4. Discriminating Lithospheric and Asthenospheric Anisotropy Beneath Northern Oman: Sharp Contrast Observed at the Semail Gap Fault Zone. Journal of Geophysical Research: Solid Earth (2024).
5. Geophysical imaging of ophiolite structure in the United Arab Emirates. Nature Communications (2020).