Tectonic Evolution and Magmatism in the Iranian Plate

The Iranian Plate occupies a key position within the Alpine–Himalayan orogenic belt, recording a long history of Gondwanan fragmentation, Neotethyan opening and closure, and Arabia–Eurasia collision. Initial Permian to Jurassic rifting detached continental fragments from Gondwana, while Neotethyan subduction along the northern Arabian margin drove Palaeozoic to Mesozoic arc magmatism. Late Cretaceous convergence initiated slab rollback and intermittent adakite-type and calc-alkaline intrusions across NW Iran. Oligocene to Miocene slab break-off, lithospheric delamination and small-scale convection introduced mantle-derived collision magmas, producing OIB-like basalts and high-K shoshonitic suites. The eventual Arabia–Eurasia collision along the Zagros suture from the Late Oligocene led to crustal thickening, development of the Sanandaj–Sirjan and Urumieh-Dokhtar magmatic arcs, and abundant porphyry Cu–Mo mineralisation in eastern ophiolite belts. Quaternary volcanism persists in eastern Iran, marking the transition from plate-boundary to intraplate processes and offering insights into mantle dynamics, crustal evolution and mineral resource formation.

Research from Nature Portfolio

A comprehensive modal analysis of Cenozoic sandstones and detrital Cr-spinel geochemistry in the Zagros suture zone has refined the timing and nature of collision between the Arabian and Iranian plates. Results indicate a provenance shift from fore-arc peridotites during the Late Cretaceous–Eocene to volcaniclastic and metasedimentary sources in the Miocene. Ophiolite obduction formed a narrow trough sub-basin in the Late Oligocene, followed by uplift of an axial metamorphic complex belt in the Miocene. This work clarifies the sequence of fore-arc deposition, ophiolite emplacement and upper-plate inversion that defines the Late Oligocene collision along the Zagros Orogen.

Tectonic Evolution and Magmatism in the Iranian Plate publication trend

The graph below shows the total number of articles in tectonic evolution and magmatism in the iranian plate across all publications each year (not limited to Nature Index journals).

Technical terms

Subduction: The process by which one tectonic plate descends beneath another into the mantle.

Slab break-off: Detachment of a subducted lithospheric plate segment, triggering uplift and magmatism.

Ophiolite: Fragments of oceanic crust and upper mantle emplaced onto continental margins during collision.

Adakite: High-alumina volcanic rock formed by melting of subducted basaltic crust at high pressure.

OIB-like basalt: Basaltic magma with trace-element patterns similar to ocean-island basalts, indicating deep mantle sources.

Continental arc: A belt of volcanic and plutonic rocks formed above a subduction zone on continental crust.

References

1. The South Armenian Block: Gondwanan origin and Tethyan evolution in space and time. Gondwana Research (2023).
2. Petrogenesis of OIB-like basaltic volcanic rocks in a continental collision zone: Late Cenozoic magmatism of Eastern Iran. Journal of Asian Earth Sciences (2015).
3. From Jurassic rifting to Cretaceous subduction in NW Iranian Azerbaijan: geochronological and geochemical signals from granitoids. Contributions to Mineralogy and Petrology (2018).
4. Exploring a link between the Middle Eocene Climatic Optimum and Neotethys continental arc flare-up. Climate of the Past (2021).
5. Revised version of the Cenozoic Collision along the Zagros Orogen, Insights from Cr-spinel and Sandstone Modal Analyses. Scientific Reports (2017).
6. The Van Microplate: A New Microcontinent at the Junction of Iran, Turkey, and Armenia. Frontiers in Earth Science (2021).