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| Icelandic volcanic province | |
|---|---|
| Name | Icelandic volcanic province |
| Location | North Atlantic Ocean |
| Coordinates | 64°N 19°W |
| Region | Iceland |
| Type | Volcanic province |
| Tectonic setting | Mid-Atlantic Ridge, Iceland hotspot |
| Major features | Vatnajökull, Mýrdalsjökull, Eyjafjallajökull, Katla, Hekla, Snæfellsjökull |
| Highest | Hvannadalshnúkur |
Icelandic volcanic province is the volcanic region encompassing the active magmatic systems that built Iceland on the Mid-Atlantic Ridge above the Iceland hotspot. It integrates rift propagation, plume magmatism, and glaciovolcanic interactions that have produced stratovolcanoes, shield volcanoes, fissure swarms, and large calderas. This province plays a central role in North Atlantic volcanism, influencing North Atlantic Drift, past human settlement in Reykjavík, and numerous scientific collaborations among institutions like University of Iceland and Icelandic Meteorological Office.
The province lies at the junction of the Mid-Atlantic Ridge and the Iceland hotspot, where divergent plate motion between the North American Plate and the Eurasian Plate drives rifting beneath Iceland. Magma generation is influenced by mantle plume upwelling associated with the Iceland plume and by extensional stresses that form rift zones, transform faults, and fissure swarms such as the Reykjanes Ridge and the Tjörnes Fracture Zone. Crustal accretion beneath features like Vatnajökull and Langjökull shows interaction between plume-derived melts and ambient upper-mantle peridotite comparable to processes observed at Iceland–Faroe Ridge and Kolbeinsey Ridge. Regional uplift and subsidence have been studied in relation to post-glacial rebound phenomena following the end of the Last Glacial Maximum.
The province is organized into major volcanic zones: the Reykjanes Volcanic Belt, the Western Volcanic Zone, the East Volcanic Zone, and the Northern Volcanic Zone, each containing multiple volcanic systems such as Hengill, Krafla, Bárðarbunga, Askja, Grímsvötn, Öræfajökull, and Snæfellsnes. Rift segments are linked by transform zones including the Tjörnes Fracture Zone and the South Iceland Seismic Zone. Many systems are named after glacial covers or local farms like Mýrdalsjökull (covering Katla) and Eyjafjallajökull. The spatial distribution of systems has been mapped by researchers from Institute of Earth Sciences (University of Iceland), Uppsala University, and British Geological Survey.
Icelandic eruptions include both effusive flood basalt episodes and explosive silicic events. Significant historical eruptions are recorded at Laki (1783–1784), whose sulfur dioxide emissions caused the Laki haze and impacted European climate and agricultural societies in France, United Kingdom, and Denmark. The 2010 eruption of Eyjafjallajökull disrupted aviation across Europe causing grounding ordered by International Civil Aviation Organization partners and triggering studies by European Centre for Medium-Range Weather Forecasts and Civil Aviation Authority (United Kingdom). The 2014–2015 Holuhraun effusive eruption from Bárðarbunga produced large flood basalts and emissions monitored by Icelandic Meteorological Office and NOAA. Earlier Holocene and late Pleistocene events include eruptions at Þórðarhyrna, Thjorsarhraun, and the postglacial Öræfajökull eruptions documented in tephrochronology studies by teams from Uppsala University, University of Cambridge, and Smithsonian Institution.
Products range from tholeiitic basalt lavas forming extensive lava fields such as Eldhraun to explosive tephra deposits, pumice layers, and silicic intrusions. Landforms include stratovolcanoes like Hekla, tuyas such as Herðubreið, subglacial volcanoes beneath Vatnajökull creating tuyas and table mountains, calderas at Askja and Bárðarbunga, and fissure-fed lava shields exemplified by Surtsey and Reykjanes Peninsula eruptions. Glacial interaction produces jökulhlaups from ice-dammed lakes at Kverkfjöll and sediment-laden outburst floods that have reshaped river systems such as the Skaftá and informed geomorphology studies by US Geological Survey collaborators.
High heat flow drives geothermal fields like Hveragerði, Krafla, Reykjanes, Hengill and the Blue Lagoon at Svartsengi, exploited by companies including Landsvirkjun and Orka náttúrunnar. Hydrothermal alteration forms solfataras, hot springs such as Geysir in Haukadalur, and fumarolic fields at Grímsvötn and Mýrdalsjökull margins. Geothermal power plants connect to grid infrastructure near Reykjavík and serve district heating, with research partnerships involving Icelandic New Energy and Reykjavík Energy. Hydrothermal mineralization yields alteration minerals studied in association with International Union of Geosciences projects and by teams from University of Copenhagen.
Hazards include explosive ash plumes affecting international aviation, lava flows threatening infrastructure in settlements such as Keflavík and Vík í Mýrdal, jökulhlaups from subglacial eruptions at Bárðarbunga and Grímsvötn, gas emissions of sulfur dioxide and carbon dioxide impacting public health in communities including Akureyri, and seismic swarms along the South Iceland Seismic Zone. Monitoring is led by Icelandic Meteorological Office using seismic networks, GPS from University of Iceland and GFZ German Research Centre for Geosciences, InSAR from European Space Agency missions, gas sensors, and collaborative hazard modelling with Met Office (United Kingdom) and US Geological Survey.
Volcanism underpins Iceland's renewable energy sector and tourism economy through attractions such as Blue Lagoon, Skaftafell, Jökulsárlón, Snæfellsjökull National Park, and cultural sites in Reykjavík and Akureyri. Eruptions have historical socio-economic consequences evident in the Laki famine affecting Denmark–Norway trade patterns and in air-traffic disruptions handled by European Commission agencies. Volcanic soils support limited agriculture in regions like Skagafjörður while ashfall can damage grazing lands and fisheries in the North Atlantic as documented by FAO studies. Environmental research on emissions involves NASA, NOAA, and European Environment Agency collaborations assessing climate forcing, cryosphere interactions, and ecosystem responses in locations such as Vatnajökull National Park.