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| Central Iran tectonic province | |
|---|---|
| Name | Central Iran tectonic province |
| Location | Iran |
| Plate | Eurasian Plate; Arabian Plate |
| Orogeny | Zagros, Alborz |
| Age | Paleozoic–Quaternary |
Central Iran tectonic province The Central Iran tectonic province is a composite continental domain in the Iranian Plateau bounded by the Zagros Fold and Thrust Belt, the Alborz Mountains, the Kopet Dag and the Makran orogenic systems. It forms a complex mosaic of continental blocks, metamorphic complexes, and sedimentary basins that records interactions among the Eurasian Plate, the Arabian Plate, and microcontinents such as Iranian Plateau microcontinent and the Turan Plate. The province hosts major mineral provinces, active seismicity, and key stratigraphic records spanning Cambrian to Quaternary time.
The province occupies the interior of the Iranian Plateau between the Persian Gulf margin and the Caspian Sea basin, integrating signals from the Alpine orogeny, the Tethys Ocean closure, and the Neotethys suturing events. Its basement comprises Precambrian to Paleozoic gneisses and schists correlated with blocks recognized in the Central Asian Orogenic Belt and the Sistan Suture Zone, overlain by Mesozoic and Cenozoic sedimentary sequences tied to episodes of rifting and compression. Major regional structures reflect shortening driven by collision between the Arabian Plate and the Eurasian Plate, subsequent strike-slip partitioning along the North Anatolian Fault–Right-lateral strike-slip fault systems, and crustal thickening associated with the development of the Zagros Fold and Thrust Belt.
Central Iran is partitioned into discrete structural zones including the Sanandaj–Sirjan Zone, the Urumieh–Dokhtar Magmatic Arc, the Lut Block, the Tabas Block, and the Central Iranian Structural Zone. These domains are delineated by major discontinuities such as the Main Recent Fault, the Doruneh Fault System, the Binalud Fault, and the Nishapur Fault, which link to regional lineaments like the Anatolian Fault System and the East Anatolian Fault. Strike-slip, reverse, and normal fault segments accommodate shortening and lateral extrusion of crustal blocks in response to Arabia–Eurasia collision dynamics and are associated with ophiolitic mélanges and metamorphic core complexes found along inferred suture zones.
Stratigraphic successions include Cambrian carbonates, Devonian shales, Permian evaporites, Triassic–Jurassic platform carbonates, and thick Cretaceous clastic and carbonate units that record the evolution of the Tethys realm. Cenozoic deposits—Paleogene flysch, Neogene conglomerates, and Quaternary alluvium—fill intra-basinal depressions such as the Kashan Basin and the Tabas Basin. Lithologies range from high-grade metamorphic rocks in the Sanandaj belt to subduction-related volcanic suites in the Urumieh–Dokhtar arc and continental red beds in the Lut Desert. Ophiolitic fragments associated with the Neotethys suture occur near the Kerman region and alongside mélanges west of Bandar Abbas.
The province is seismically active with historic and instrumental events on faults linked to the Arabia–Eurasia collision and local crustal readjustment. Notable seismic sequences have affected cities such as Tabas, Kerman, Mashhad, and Isfahan, producing significant earthquakes documented in catalogs maintained by regional agencies and international observatories like the International Seismological Centre. Paleoseismic trenching on faults including the Doruneh Fault and the North Tabriz Fault reveals Holocene rupture histories; seismic hazard is amplified by shallow crustal ruptures and high population density in urban centers such as Shiraz and Tehran peripheries.
Tectonic evolution reflects successive Phanerozoic cycles: Gondwanan inheritance, rifting and opening of the Neotethys, closure and continental collision during the Cenozoic Alpine orogeny, and ongoing lateral extrusion and indentation by the Arabian Plate. Processes include crustal shortening, slab roll-back and break-off beneath the Urumieh–Dokhtar arc, lithospheric delamination under elevated topography, and transcurrent deformation linking the Zagros to the Alborz orogens. Thermochronology, geochronology, and mantle tomography studies across the province tie exhumation histories to episodes recorded in K–Ar and U–Pb ages from the Sanandaj–Sirjan Zone and magmatic arcs.
The province hosts major mineral deposits: porphyry‑Cu and epithermal Au systems in the Urumieh–Dokhtar Magmatic Arc, skarn and MVT occurrences near Kerman, and significant iron deposits in the Bafq–Golpayegan region. Stratabound Pb‑Zn lenses, barite, and evaporite-hosted sulphates occur in basins like Tabas; rare‑metal pegmatites and chromite in ophiolitic blocks supply strategic commodities. Mining districts are linked to frameworks studied by organizations such as the Geological Survey of Iran and international partners; exploration targets are influenced by structural traps, hydrothermal alteration, and metallogenic belts correlated with Mesozoic–Cenozoic magmatism.
Seismic and geodetic monitoring is conducted by institutions including the International Seismological Centre, national seismic networks, and university research groups in Tehran University and Shiraz University. Hazard mitigation emphasizes building codes informed by past events in Tabas and Bardaskan, landslide and liquefaction susceptibility in alluvial plains, and emergency planning coordinated with provincial authorities. Ongoing work integrates InSAR deformation studies, GPS campaigns, and paleoseismology to refine seismic hazard models and guide infrastructure resilience across the province.
Category:Tectonics Category:Geology of Iran