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| Tethys orogeny | |
|---|---|
| Name | Tethys orogeny |
| Period | Mesozoic–Cenozoic |
| Type | Orogenic belt |
| Location | Eurasia, Africa, Arabia |
Tethys orogeny The Tethys orogeny denotes the series of mountain-building events associated with the closure of the Tethys Ocean and the collision of continental fragments including Eurasia, Africa, Arabia, India and microcontinents such as Anatolia, Caucasus, Aegean and Iran. It produced major orogenic belts including the Alps, Himalayas, Zagros, Atlas and Carpathians. Research spans contributions from institutions like the Geological Society of America, European Geophysical Union, Russian Academy of Sciences, Geological Survey of India and United States Geological Survey.
The Tethys orogeny encompasses progressive deformation during the convergence of plates from the Laramide orogeny-adjacent realms through the Cenozoic into latest Mesozoic time, producing the Alpine belt and collisional systems from the Iberia to Southeast Asia. Key figures in its conceptual development include Eduard Suess, Alfred Wegener, Arthur Holmes, Alfred Krischer and institutions like the Institut de Physique du Globe de Paris. The orogeny links events recorded in stratigraphic archives curated by the British Geological Survey, Bundesanstalt für Geowissenschaften und Rohstoffe, Geological Survey of Iran and regional universities.
Closure of the Tethys Ocean proceeded as the African Plate, Indian Plate, Arabian Plate and various microplates converged toward the Eurasian Plate, producing subduction zones, ophiolite emplacement and accretionary wedges documented along the Hellenic arc, Makran Trench, Anatolian fault system and Karakoram fault. Oceanic lithosphere from remnants like the Neo-Tethys and Paleo-Tethys was consumed beneath overriding plates, creating magmatic arcs such as the Caucasus volcanic arc, Alboran volcanic province and Himalayan arc. Plate reconstructions rely on paleomagnetic datasets from the College de France collections, seismic tomography from Scripps Institution of Oceanography and geodetic measurements from European Space Agency missions.
Deformation began in the Late Triassic–Jurassic with rifting and basin formation, intensified during the Cretaceous with ophiolite emplacement and accretion, and culminated in major collisions in the Paleogene and Neogene. Distinct phases recognized by researchers at Cambridge, ETH Zurich, Stanford University, Università di Padova and National Autonomous University of Mexico include pre-collisional subduction, syn-collisional crustal shortening and post-collisional extension. Key time markers are closure episodes recorded in sections from Dinarides, Pontides, Makran, Eastern Anatolia and Tibetan Plateau.
Orogenic domains show styles ranging from thin-skinned thrusting in the Pyrenees and Carpathians to thick-skinned deformation in the Himalaya and Zagros. Major structural features include large-scale nappes in the Alps, metamorphic core complexes in Greece, strike-slip systems like the North Anatolian Fault, and fold-and-thrust belts in the Apennines and Atlas. Metamorphic gradients vary from low-grade blueschist in subduction remnants of Caucasus and Cyprus to high-grade granulite and eclogite facies in the Sistan Suture Zone and Himalayan collision belt, with thermobarometric studies published by London Geol. Soc. and American Geophysical Union authors.
Magmatic histories involve island-arc volcanism, arc-continent collision magmatism and post-collisional granitoid intrusions exposed in regions such as Sierra Morena, Central Anatolia, Iranian Plateau and Himalayan syntaxes. Large igneous provinces and granitoid suites linked to subduction include calc-alkaline arcs of the Pontic Mountains, adakitic melts in the Tibetan Plateau, and ultrapotassic to shoshonitic suites in the Alborz Mountains. Petrochemical work from Geological Survey of Canada, Chinese Academy of Sciences, Universidad Complutense de Madrid and Max Planck Institute for Chemistry informs mantle source and crustal assimilation models.
Sedimentary basins developed in foreland, back-arc and intracontinental settings across the orogen: examples include the Po Basin, Indus Basin, Caspian Basin, Dead Sea Transform basin and North African basins such as the Saharan Basin. Marine to continental transitions recorded in the Menderes Massif, Sivas Basin, Baluchistan and Siberian platforms preserve biostratigraphic records tied to faunal provinces documented by museums like the Natural History Museum, London and Muséum national d'Histoire naturelle. Sequence stratigraphy and provenance studies from University of Buenos Aires, Monash University, University of Cape Town and Seoul National University chart shifts in sediment supply linked to uplift and climate change under influence of Paleocene–Eocene Thermal Maximum events.
The Tethyan belts host hydrocarbon provinces in the Persian Gulf, Caspian Sea, North Sea-adjacent basins, and orogenic gold and porphyry copper systems in the Kerman province, Tajikistan, Balkan Peninsula and Turkey. Metallogenic provinces include volcanogenic massive sulfide deposits in Greece and Bulgaria, orogenic gold in the Karakoram-adjacent terranes, and chromite-bearing ophiolites exposed in Albania, Oman and Italy. Economic geology investigations by BP, Shell plc, TotalEnergies, Rio Tinto Group and national surveys inform exploration models.
Debates center on timing and mechanisms of collision, the role of microplates such as Cimmeria and Sibumasu, extent of continental subduction versus underthrusting, and drivers of syn-orogenic extension. Competing models by teams at MIT, Caltech, Geophysical Fluid Dynamics Laboratory and Peking University emphasize slab breakoff, indentation tectonics, and gravitational collapse. Controversies also address correlations between ophiolite emplacement and closure sequences articulated in works from University of Geneva, Universidad Nacional Autónoma de México, Academia Sinica and Russian Academy of Sciences. Ongoing data from International Ocean Discovery Program, GEOSCOPE, IRIS and satellite geodesy by NASA continue to refine models and resolve paleogeographic reconstructions.
Category:Orogenies