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| Sicilian microplate | |
|---|---|
| Name | Sicilian microplate |
| Type | Microplate |
| Region | Central Mediterranean |
| Coordinates | 37°N 14°E |
| Area km2 | 100000 |
| Move direction | NNE–SSE convergence |
| Move speed | 1–5 mm/yr |
| Adjacent plates | African Plate; Eurasian Plate; Adriatic Plate; Ionian Sea lithosphere |
| Notable features | Mount Etna; Pelagie Islands; Sicily; Messina Strait |
Sicilian microplate is a small lithospheric block in the central Mediterranean whose kinematics and internal structure influence tectonics across Sicily, the Strait of Messina, the Ionian Sea, and adjacent sectors of the Tyrrhenian Sea. It occupies a strategic position between the African Plate, the Eurasian Plate, and the Adriatic Plate, and interacts with nearby tectonic entities such as the Calabrian Arc and the Apennine Mountains. Studies of the block integrate data from researchers and institutions including the Istituto Nazionale di Geofisica e Vulcanologia, the Euro-Mediterranean Seismological Centre, and international programs like the European Plate Observing System.
The microplate lies within the complex plate mosaic involving the African Plate and the Eurasian Plate margin, bounded by the retreating subduction of the Ionian lithosphere beneath the Calabrian Arc and the back-arc opening of the Tyrrhenian Basin. Regional interactions implicate tectonic domains such as the Siculo-Calabrian thrust belt, the Maghrebian Chain, and the Peloritani Mountains, connecting with tectonic provinces studied in projects by the Mediterranean Ridge and the Hellenic Arc research communities. GPS networks provided by GEOSCOPE, EUREF, and national observatories constrain present-day motion relative to the European Plate and the African Plate.
The block’s evolution reflects Neogene–Quaternary processes tied to the closure of the Tethys Ocean, the collision between Adria and Europe, and the progressive rollback of the Ionian slab beneath the Calabrian Arc. Paleogeographic reconstructions link the microplate to syn-orogenic basins like the Sicily Channel Basin and the Gela Basin and to Mediterranean-wide events such as the Messinian salinity crisis. Tectonostratigraphic records correlate with stratigraphic markers used in studies by the International Ocean Discovery Program and sedimentary compilations in the Mediterranean Sea.
Northern boundaries abut the Tyrrhenian Sea back-arc region and the Apennines foredeep, while eastern margins are defined by the Calabrian Arc subduction trench and the Messina fault system. Western and southern limits interface with the Sicily Channel Rift and the continental margins of Tunisia and Malta. Key structural elements include transform faults, thrust nappes in the Sicula Flysch, imbricated thrust sheets in the Madonie Mountains, and extensional basins offshore that reflect interactions with the Hyblean Plateau and the Pelagie Block.
Seismicity concentrates along the Messina Strait zone, the offshore Gela Basin margins, and the Calabrian Arc subduction front, producing events cataloged by the International Seismological Centre and historical catalogs such as those compiled after the 1908 Messina earthquake. Active volcanism, notably Mount Etna and submarine centers south of Sicily, records mantle source variations linked to slab rollback and slab-window processes discussed in literature referencing the Campi Flegrei, the Aeolian Islands, and the Hellenic volcanic arc. Seismotectonic hazard assessments by the European Seismic Hazard Commission and national agencies use focal mechanisms, moment tensors, and paleoseismology from sites like Noto and the Peloritani chain.
Multidisciplinary evidence derives from seismic reflection/refraction profiles acquired by programs such as MedSea, gravity and magnetic surveys by the Bureau Gravimétrique International standards, and mantle tomography efforts led by consortia including ORFEUS and the European Geosciences Union initiatives. Tomographic images reveal high-velocity slabs beneath the Calabrian Arc and low-velocity zones beneath Mount Etna, while geochemical signatures from rocks tie to sources investigated in studies from the Geological Survey of Italy and universities like Sapienza University of Rome and the University of Palermo.
Stratigraphic sequences onshore and offshore record Plio-Quaternary uplift, basin inversion and synorogenic deposition, with lithostratigraphic units such as the Gessoso-solfifera Formation and Messinian evaporites overlain by Pleistocene marine terraces studied near Trapani, Catania, and the Egadi Islands. Sediment provenance analyses reference hinterland sources including the Sicani Mountains and the Nebrodi Mountains, and correlate with turbidite systems into the Ionian abyssal plain as sampled by expeditions of the International Marine Research Center and archives maintained by the National Repository of Sea Cores.
Understanding the microplate refines models of central Mediterranean geodynamics, influencing interpretations of plate rollback, slab break-off, and the evolution of the Tyrrhenian Sea and Adriatic Sea basins. Its kinematics impact regional stress fields relevant to cross-border infrastructure managed by entities like the European Commission and national ministries, and bear on paleoenvironmental reconstructions tied to the Messinian salinity crisis and Mediterranean circulation changes examined by the Intergovernmental Oceanographic Commission.
Category:Geology of Italy Category:Plate tectonics Category:Microplates