Harrat Khaybar

Harrat Khaybar
Name	Harrat Khaybar
Location	Saudi Arabia
Type	Volcanic field

Harrat Khaybar is a large volcanic field in northwest Saudi Arabia noted for extensive basaltic and silicic volcanism near the Hijaz Mountains, Red Sea, and the city of Medina. The volcanic field lies within the Arabian Plate and contributes to regional studies of rifting associated with the Red Sea Rift, Afar Triple Junction, and plate boundary evolution involving the African Plate and Eurasian Plate. Harrat Khaybar is studied alongside other Arabian volcanic provinces such as Harrat Rahat, Harrat Lunayyir, and Harrat Kishb by researchers from institutions including the Saudi Geological Survey, King Abdulaziz University, Smithsonian Institution, and the United States Geological Survey.

Geography and geology

The volcanic field occupies a substantial portion of the Hejaz region north of Mecca and east of the Gulf of Aqaba, proximal to the historic city of Medina and archaeological sites like Madāʼin Ṣāliḥ. It sits on Mesozoic and Cenozoic sedimentary sequences of the Arabian Plate and overlies Precambrian basement rocks correlated with the Neftan Metamorphic Complex and shields of the Arabian Shield. Regional tectonics link Harrat Khaybar to the Red Sea Rift, the Gulf of Suez Rift, and the broader East African Rift System, with intraplate magmatism associated with mantle upwelling modeled by researchers at King Abdullah University of Science and Technology and the Max Planck Institute for Chemistry. Geophysical surveys using seismic tomography from groups at MIT, Columbia University, and ETH Zurich have imaged low-velocity anomalies beneath the field similar to those beneath Iceland and Ethiopia.

Volcanic features and lava fields

The field contains numerous volcanic edifices including stratovolcano analogs, scoria cones, and extensive ʻaʻā and pāhoehoe-like lava flows recorded by mapping teams from University of Oxford, University of Cambridge, and California Institute of Technology. Prominent silicic features comprise obsidian flows and welded ignimbrites analogous to those at Santorini and Edziza; petrologists compare them with deposits at Mount St. Helens and Mount Pinatubo. Lava fields extend toward the Nafud Desert and are dissected by wadis documented by researchers from University of Toronto and the Max Planck Institute for Geochemistry. Satellite remote sensing using platforms operated by NASA, European Space Agency, and JAXA has been used to map flow extents and thermal anomalies, building on earlier aerial work by the Royal Geographical Society.

Eruptive history and chronology

Radiometric dating campaigns employing potassium-argon and argon-argon methods conducted by teams at University of Oxford, Australian National University, and Scripps Institution of Oceanography have established a Pleistocene to Holocene eruptive timeline. Historic and geologic evidence suggests episodic activity contemporaneous with uplift events correlated to the Holocene climatic optimum, and comparisons are made to Holocene eruptions at Mount Vesuvius, Krakatoa, and Mount Etna. Paleomagnetic studies by Purdue University and Harvard University align lava flows with regional geomagnetic excursions used to refine chronology tied to global events like the Laschamp Event. Monitoring initiatives from the Saudi Geological Survey and cooperative international teams integrate satellite InSAR data from Copernicus and seismic arrays developed with IRIS to assess present-day deformation.

Petrology and geochemistry

Lavas range from alkaline basalts to high-silica rhyolites; geochemical analyses by laboratories at Carnegie Institution for Science, Geological Survey of Iran, and University of Tokyo document mantle source heterogeneity, fractional crystallization, and crustal assimilation processes analogous to mechanisms inferred for Hawaii and Icelandic systems. Isotopic signatures (Sr-Nd-Pb-Hf) reported by teams at University of Cambridge and ETH Zurich indicate contributions from enriched mantle domains similar to those sampled at Djibouti and Yemen, with trace-element patterns paralleling those at Canary Islands hotspots. Experimental petrology at University of California, Berkeley and Massachusetts Institute of Technology constrains magma evolution under variable pressure-temperature conditions comparable to those beneath Mount Erebus.

Human history and archaeology

The volcanic landscape hosts archaeological sites documented by excavations from British Museum, University of Saudi Arabia, and CNRS teams, connecting stone tool scatters and petroglyphs to human use of obsidian reminiscent of procurement patterns seen at Çatalhöyük and Jericho. Trade networks inferred from geochemical sourcing link obsidian artifacts to Neolithic and Bronze Age exchanges involving ports on the Red Sea and caravan routes toward Petra and Palmyra. Historic accounts from travelers like Ibn Battuta and cartographers of the Ottoman Empire reference lava terrains, while modern surveys by UNESCO and the International Council on Monuments and Sites assess cultural heritage risks from development projects sponsored by Saudi Vision 2030 stakeholders, including Saudi Aramco and regional municipalities.

Ecology and climate impacts

The volcanic substrates influence soil formation and vegetation colonization patterns studied by ecologists at University of Oxford, King Saud University, and Royal Botanic Gardens, Kew, which compare primary succession processes to those at Iceland and Mount St. Helens. Local biodiversity assessments document adapted flora and fauna with ecological parallels to Arabian Peninsula assemblages and island biogeography cases like Socotra, while climate interactions are evaluated in the context of monsoon variability, aerosol forcing, and albedo effects considered in models by IPCC researchers and climate teams at NOAA and Hadley Centre. Impacts on hydrology and groundwater recharge have been examined by World Bank–funded initiatives and hydrogeologists from University of Arizona and Imperial College London assessing implications for regional water resources.

Category:Volcanoes of Saudi Arabia