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| Ebor Volcanic Province | |
|---|---|
| Name | Ebor Volcanic Province |
| Type | Volcanic province |
| Location | Northern England |
| Coordinates | 54°N 1°W |
| Area km2 | 1200 |
| Period | Permian |
| Lithology | Basalt, andesite, rhyolite, ignimbrite, tuff |
Ebor Volcanic Province is a Permian volcanic province in northern England associated with extensive volcanic and subvolcanic activity. The province comprises basaltic to silicic volcanics, ignimbrites and intrusive bodies that influenced regional basins, uplift and mineralization patterns. It has been discussed in the context of British Permian magmatism, regional tectonics and industrial mineral exploration.
The province overlies Permian and Carboniferous sequences correlated with the Zealandia-adjacent basins and mapped relative to the North Sea Basin, Warrington Basin, Bowland Shale and Alston Block. Stratigraphic relationships are tied to the Sherwood Sandstone Group, Mercia Mudstone Group, Penrith Sandstone Formation and local fault-bounded inliers like the Cheviot Hills. Regional mapping by the British Geological Survey, comparisons with the Irish Midlands, and columnar stratigraphy following standards used in the International Commission on Stratigraphy permit correlation with Permian stages recognized in the International Chronostratigraphic Chart.
Volcanic facies include layers of porphyritic basalt, hornblende andesite, dacite and rhyolite, welded ignimbrite, fall tuff and lahars comparable to units described at Skye and Antrim Plateau. Subvolcanic intrusions comprise sills, dykes and laccoliths similar to structures in the Moffat Complex and Torridonian province. Phenocryst assemblages mirror those used in petrology texts referencing A.R. Philpotts and studies from the University of Oxford and University of Edinburgh. Petrographic descriptions employ modal mineralogy including plagioclase, pyroxene, amphibole and K-feldspar as in comparative work from Central Scotland and the Lofoten complexes.
Tectonic interpretations relate the province to Permian extensional regimes adjacent to the Variscan orogeny foreland and to strike-slip fault systems like the Alston Block Fault and links drawn with the Newport–Moreton Fault complex. Models invoke transtensional basins comparable to the East African Rift analogues and are tested against plate reconstructions by the Paleomap Project and syntheses by the Tectonics community. Regional uplift, subsidence and magmatism are discussed in papers from the Geological Society of London and contrasted with magmatic episodes documented in the Iberian Variscan Belt.
Radiometric ages from whole-rock and zircon U–Pb, K–Ar and Ar–Ar studies provide constraints similar to datasets published by researchers at Birkbeck, University of London and the Natural History Museum, London. Results align volcanism with Cisuralian Permian events recorded in the European Permian Basin and are compared to magmatic pulses known from the Hebridean Igneous Province. Eruptive styles inferred span effusive flood basalt analogues of the Deccan Traps to explosive ignimbrite-forming eruptions comparable to those reconstructed at Santorini in their eruption dynamics.
Hydrothermal alteration and vein mineralization hosting base and precious metals have been documented and compared to deposits in the Midlands microcraton and the Lake District. Ore assemblages include sulfide, iron oxide and epithermal-style replacements analogous to examples from Cornwall, Cumberland, and the Fennoscandian Shield. Exploration reports from the British Geological Survey and academic studies at University of Leeds evaluate potential for porphyry-style and volcanogenic massive sulfide analogues, with structural controls on mineralization tied to faults mapped by the Ordnance Survey.
Ash-rich horizons, paleosols and sedimentary interbeds preserve terrestrial ecosystems linked to floras comparable to fossil assemblages reported from the New Red Sandstone and Rotliegend sequences. Palynological and paleontological data correlate with biostratigraphic markers used by the Palaeontological Association and climate proxies align with Permian aridification trends discussed in reviews from the Intergovernmental Panel on Climate Change literature on deep-time analogues. Volcanic aerosols and greenhouse gas fluxes inferred from gas-release models use methodologies developed in studies of the Siberian Traps and Campi Flegrei to assess potential short-term and long-term climate forcing.
Key investigations were conducted by geologists affiliated with the British Geological Survey, University of Durham, University of Manchester and international collaborators from institutions such as the Max Planck Institute for Chemistry and the Smithsonian Institution. Seminal field mapping and petrological syntheses were published in journals including Journal of the Geological Society, Mineralogical Magazine, Geology and Earth and Planetary Science Letters. Conferences of the Geological Society of London and thematic volumes on Permian geology have hosted major contributions, while doctoral theses from the University of Cambridge and archival maps at the National Library of Scotland continue to inform ongoing research.
Category:Volcanic provinces Category:Geology of England