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| The '''British Tertiary Volcanic Province (BTVP)''', synonymous with the term '''British Tertiary Igneous Province (BTIP)''',{{efn|This designation has as a part of it a term, ']', that is now discouraged as a formal geochronological unit by the ].<ref>{{cite book|author=Ogg, James G.; Gradstein, F. M; Gradstein, Felix M.|title=A geologic time scale 2004|publisher=Cambridge University Press|location=Cambridge, UK|year=2004|isbn=0-521-78142-6}}</ref>}} is a ] formed during a time of intense volcanic activity 52-63 million years ago<ref name="mussett1988" /> in Britain in the ] and early ] ]s of the ] ]. During the break up of the ] ], as the ] and ] rifted apart<ref>{{cite journal|last=Nance|first=R. Damian|coauthors=Murphy, J. Brendan; Santosh, M.|title=The supercontinent cycle: A retrospective essay|journal=Gondwana Research|date=January 2014|volume=25|issue=1|pages=4–29|doi=10.1016/j.gr.2012.12.026}}</ref> to form the ], Britain sat above a ] (hotspot).<ref>{{cite journal|last=Thompson|first=R. N.|title=Magmatism of the British Tertiary Volcanic Province|journal=Scottish Journal of Geology|date=1 February 1982|volume=18|issue=1|pages=49–107|doi=10.1144/sjg18010049}}</ref> As the earth's crust was stretched above the ] hotspot under stress from plate rifting,<ref>{{cite journal|last=Thompson|first=R. N.|author2=Gibson, S. A.|title=Subcontinental mantle plumes, hotspots and pre-existing thinspots|journal=Journal of the Geological Society|date=1 December 1991|volume=148|issue=6|pages=973–977|doi=10.1144/gsjgs.148.6.0973}}</ref> fissures opened up along a line from ] to the ] and ] complexes were formed.<ref name="hitchen1993">{{cite journal|last=Hitchen|first=K.|author2=Ritchie, J. D.|title=New K-Ar ages, and a provisional chronology, for the offshore part of the British Tertiary Igneous Province|journal=Scottish Journal of Geology|date=1 May 1993|volume=29|issue=1|pages=73–85|doi=10.1144/sjg29010073}}</ref> Hot ] over 1000 °C surfaced as multiple, successive and extensive ] flows covered over the original landscape, burning forests, filling river valleys, burying hills, to eventually form a ] named the ], which contains various volcanic landforms such as ] and ].<ref name="emeleus1992" /> There was more than one period of volcanic activity during the BTVP, in between which sea levels rose and fell and ] took place.<ref>{{cite journal|last=Williamson|first=I. T.|author2=Bell, B. R.|title=The Palaeocene lava field of west-central Skye, Scotland: Stratigraphy, palaeogeography and structure|journal=Transactions of the Royal Society of Edinburgh: Earth Sciences|date=3 November 2011|volume=85|issue=01|pages=39–75|doi=10.1017/S0263593300006301}}</ref> | |||
| {{R with possibilities}} | |||
| ==The BTVP within the Thulean Plateau== | |||
| The ], also synonymous with the ] and the Thulean Province, was a vast basaltic lava plain that possibly extended over 1,800,000 km<sup>2</sup> (700,000 sq mi), which was broken up during the formation of the Atlantic Ocean, leaving remnants existing in the BTVP of ], northwestern ] and scattered bits in ] and ], and outside the BTVP in the ], bits of northwestern ], eastern ] and western ]. | |||
| Extensive outpourings of lava occurred, particularly in East Greenland,<ref>{{cite journal|last=Riisager|first=Janna|coauthors=Riisager, Peter; Pedersen, Asger Ken|title=Paleomagnetism of large igneous provinces: case-study from West Greenland, North Atlantic igneous province|journal=Earth and Planetary Science Letters|date=September 2003|volume=214|issue=3-4|pages=409–425|doi=10.1016/S0012-821X(03)00367-4}}</ref> which during the Paleogene was then adjacent to Britain. Little is known of the ] of the opening of the North Atlantic between Greenland and Europe,<ref>{{cite journal|last=Geoffroy|first=Laurent|coauthors=Bergerat, Francoise; Angelier, Jacques|title=Brittle tectonism in relation to the Palaeogene evolution of the Thulean/NE Atlantic domain: a study in Ulster|journal=Geological Journal|date=September 1996|volume=31|issue=3|pages=259–269|doi=10.1002/(SICI)1099-1034(199609)31:3<259::AID-GJ711>3.0.CO;2-8}}</ref> but studies have suggested and are hotly debated, that the modern day ] corresponds to the earlier 'North Atlantic mantle plume' that would have created the Thulean plateau.<ref>{{cite journal|last=Lundin|first=Erik R.|author2=Anthony G. Doré|title=Fixity of the Iceland "hotspot" on the Mid-Atlantic Ridge: Observational evidence, mechanisms, and implications for Atlantic volcanic margins|journal=Geological Society of America Special Papers|year=2005|volume=388|pages=627–651|doi=10.1130/0-8137-2388-4.627}}</ref> The BTVP, particularly West Scotland, provides relatively easy access, compared to the largely inaccessible basalt fields of West Greenland, to deeply eroded relics of the central volcanic complexes. So the BTVP is a window into understanding igneous ], evolution of magma, controls of episodic volcanic activity, mechanism and driving force behind ocean opening, hotspot relations to ocean formation.<ref name="emeleus1992" /> | |||
| ==Volcanic and igneous landforms and their extent within the BTVP== | |||
| ] | |||
| ] | |||
| ] | |||
| ] | |||
| Volcanic activity would have started with ] accumulations, like ], quickly followed by vast outpourings of highly ] basaltic lava during successive eruptions through multiple volcanic vents or in linear fissures. As ] low ] lava reached the surface it rapidly cooled and solidified, successive flows built up layer upon layer, each time filling and covering existing landscapes. ]s and ]s were formed when the lava flowed into lakes, rivers and seas. Magma that did not make it to the surface as flows froze in conduits as ] and ] and large amounts spread laterally to form ]. ]s extended across the British Isles throughout the ]. Individual central complexes developed with arcuate intrusions (cone sheets, ]s and ]), the intrusions of one centre cut through earlier centres recording magmatic activity with time. During intermittent periods of erosion and change in sea levels, heated waters circulated through the flows altering the basalts and deposited distinctive suites of ] minerals.<ref name="mussett1988" /> | |||
| ===Distribution=== | |||
| Locations of major intrusion complexes within the BTVP: | |||
| * ] <ref>{{cite book|last=Smith|first=Sandy|title=Island Studies|year=1997|publisher=Lundy Field Society|location=Bideford|author2=Clive Roberts|editor=Irving, RA, Schofield, AJ and Webster, CJ|chapter=The Geology of Lundy|url=http://www.lundy.org.uk/download/is/LFS_Island_Studies_Smith_Roberts-Geology.pdf|accessdate=7 Nov 2013}}</ref><ref>{{cite journal|last=Thorpe|first=R. S.|coauthors=Tindle, A. G.; Gledhill, A.|title=The Petrology and Origin of the Tertiary Lundy Granite (Bristol Channel, UK)|journal=Journal of Petrology|date=1 December 1990|volume=31|issue=6|pages=1379–1406|doi=10.1093/petrology/31.6.1379}}</ref> | |||
| * ] <ref>{{cite web|title=Carlingford Volcanic Centre|url=http://www.gsi.ie/Education/Sites+Walks+Field+Trips/Carlingford+Volcanic+Centre.htm|publisher=Geological Survey of Ireland|accessdate=7 Nov 2013}}</ref><ref>{{cite journal|last=Le Bas|first=M. J.|title=On the Origin of the Tertiary Granophyres of the Carlingford Complex, Ireland|journal=Proceedings of the Royal Irish Academy. Section B: Biological, Geological, and Chemical Science|year=1966/1967|volume=65|pages=325–338|url=http://www.jstor.org/stable/20518864}}</ref> | |||
| * ]<ref>{{cite web|last=Devlin|first=Pat|title=Mourne Mountains|url=http://www.devlin-family.com/Mournes.htm|work=The Devlin Family On-Line|accessdate=7 Nov 2013}}</ref><ref>{{cite journal|last=Hood|first=D|coauthors=Meighan, I., Gibson, D. and Mccormack, A.|year=1981|title=The Tertiary Granites Of The Eastern And Western Mourne Centers, Northern-Ireland|journal=Journal of the Geological Society|volume=138|month=July)pages=497-497}}</ref> | |||
| * ] -]<ref>{{cite web|last=Porter|first=E M|title=Slieve Gullion Ring - Overview|url=http://www.habitas.org.uk/escr/site.asp?item=1118|work=Geological Sites in Northern Ireland - Earth Science Conservation Review|publisher=National Museums Northern Ireland|accessdate=7 Nov 2013|date=3 May 2003}}</ref><ref>{{cite journal|last=Gamble|first=J. A.|coauthors=Meighan, I. G.; Mccormick, A. G.|title=The petrogenesis of Tertiary microgranites and granophyres from the Slieve Gullion Central Complex, NE Ireland|journal=Journal of the Geological Society|date=1 February 1992|volume=149|issue=1|pages=93–106|doi=10.1144/gsjgs.149.1.0093}}</ref> | |||
| * ]<ref>{{cite web|title=Geology Section|url=http://www.arranmuseum.co.uk/Geology%20Pages/geology.htm|publisher=Isle of Arran Heritage Museum|accessdate=7 Nov 2013}}</ref><ref>{{cite journal|last=Meade|first=F. C.|coauthors=Chew, D. M.; Troll, V. R.; Ellam, R. M.; Page, L. M.|title=Magma Ascent along a Major Terrane Boundary: Crustal Contamination and Magma Mixing at the Drumadoon Intrusive Complex, Isle of Arran, Scotland|journal=Journal of Petrology|date=22 December 2009|volume=50|issue=12|pages=2345–2374|doi=10.1093/petrology/egp081}}</ref> | |||
| * ]<ref>{{cite web|last=Jones|first=Rosalind|title=The Geology of Mull|url=http://www.mull.zynet.co.uk/nature/geology_mull_advanced.htm|work=Mull and Iona Chamber of Commerce - Holiday information site|publisher=Mull and Iona Chamber of Commerce|accessdate=2013-12-19}}</ref><ref>{{cite journal|last=Dagley|first=P.|coauthors=Mussett, A. and Skelhorn, R.|year=1983|title=Polarity Stratigraphy And Duration of the Mull Tertiary Igneous Intrusive Complex|journal=Geophysical Journal of the Royal Astronomical Society|volume=73|issue=1|pages=308-308}}{{clarify|date=December 2013}}</ref> | |||
| * ]<ref>{{cite web|title=Tertiary Volcanic Complex - Shepherd's Hut, Kilchoan, Ardnamurchan|url=http://www.thelochanshepherdshut.co.uk/Tertiary-Volcanic-Complex.html|work=The Lochan Shepherd's Hut|accessdate=7 Nov 2013}}</ref><ref>{{cite journal|last=Geldmacher|first=Jörg|coauthors=Haase, Karsten M.; Devey, Colin W.; Garbe-Schönberg, C. Dieter|title=The petrogenesis of Tertiary cone-sheets in Ardnamurchan, NW Scotland: petrological and geochemical constraints on crustal contamination and partial melting|journal=Contributions to Mineralogy and Petrology|date=27 April 1998|volume=131|issue=2-3|pages=196–209|doi=10.1007/s004100050388}}</ref> | |||
| * ]<ref>{{cite journal|last=Holness|first=M.B.|author2=Isherwood, C.E.|title=The aureole of the Rum Tertiary Igneous Complex, Scotland|journal=Journal of the Geological Society|date=1 January 2003|volume=160|issue=1|pages=15–27|doi=10.1144/0016-764901-098}}</ref> | |||
| * ]<ref>{{cite journal|last=Dagley|first=P.|author2=Mussett, A. E.|title=Palaeomagnetism and radiometric dating of the British Tertiary Igneous Province: Muck and Eigg|journal=Geophysical Journal International|date=April 1986|volume=85|issue=1|pages=221–242|doi=10.1111/j.1365-246X.1986.tb05180.x}}</ref> | |||
| * ]<ref>{{cite web|title=Skye – Cuillin Hills|url=http://www.scottishgeology.com/geo/regional-geology/hebrides/skye-cuillin-hills/|publisher=scottishgeology.com|accessdate=7 Nov 2013}}</ref><ref>{{cite journal|last=Fowler|first=S. J.|coauthors=Bohrson, W. and Spera, F.|title=Magmatic Evolution of the Skye Igneous Centre, Western Scotland: Modelling of Assimilation, Recharge and Fractional Crystallization|journal=Journal of Petrology|date=19 August 2004|volume=45|issue=12|pages=2481–2505|doi=10.1093/petrology/egh074}}</ref> | |||
| * ]<ref name="Meighan 227–233">{{cite journal|last=Meighan|first=I. G.|coauthors=Fallick, A. E.; McCormick, A. G.|title=Anorogenic granite magma genesis: new isotopic data for the southern sector of the British Tertiary Igneous Province|journal=Transactions of the Royal Society of Edinburgh: Earth Sciences|date=3 November 2011|volume=83|issue=1-2|pages=227–233|doi=10.1017/S0263593300007914}}</ref> | |||
| * ]<ref>{{cite journal|last=Bull|first=J. M.|author2=Masson, D. G.|title=The southern margin of the Rockall Plateau: stratigraphy, Tertiary volcanism and plate tectonic evolution|journal=Journal of the Geological Society|date=1 August 1996|volume=153|issue=4|pages=601–612|doi=10.1144/gsjgs.153.4.0601}}</ref> | |||
| Locations of submarine central complexes within the BTVP:<ref name="hitchen1993" /> | |||
| * ] | |||
| * ] | |||
| * Blackstones Bank | |||
| * Brendan | |||
| * Erlend | |||
| Other notable locations with spectacular igneous landforms within the BTVP: | |||
| * ] - Polygonal basalt columns, which seen from above are large hexagonal pavements<ref>{{cite web|title=Geological Succession|url=http://www.qub.ac.uk/geomaterials/weathering/causeway/geologicalsuccession.html|work=Giant's Causeway|accessdate=7 Nov 2013}}</ref> | |||
| * ] and ] - Basalt lava field with great thicknesses of boulder conglomerate, examples of periods of erosion by fast flowing rivers in between the lava flows.<ref>{{cite web|title=Canna and Sanday|url=http://www.snh.org.uk/publications/on-line/geology/rumsmallislands/canna.asp|work=Rum and the Small Islands Online Publication|publisher=Scottish Natural Heritage|accessdate=7 November 2013}}</ref> | |||
| * ] <ref>{{cite journal|title=The Brockley Dolerite Plug and the Church Bay Volcanic Vent, Rathlin Island, Co. Antrim|first=J.|last=Dawson|journal=The Irish Naturalists' Journal|volume=10|issue=16|volume=April|volume=1951|pages=156–162|url=http://www.jstor.org/stable/25533950|accessdate=7 Nov 2013}}</ref> - ] and ] lava flows | |||
| * ] on the Isle of ] - Polygonal basalt columns eroded to form a cave<ref>{{cite journal|last=Williamson|first=I. T.|author2=Bell, B. R.|title=The Staffa Lava Formation: graben-related volcanism, associated sedimentation and landscape character during the early development of the Palaeogene Mull Lava Field, NW Scotland|journal=Scottish Journal of Geology|date=24 May 2012|volume=48|issue=1|pages=1–46|doi=10.1144/0036-9276/01-439}}</ref> | |||
| * ]<ref name="Meighan 227–233"/> - ] | |||
| * ], North Yorkshire - Dyke swarm related to the Mull intrusive complex <ref>{{cite journal|last=MacDonald|first=R.|coauthors=Wilson, L.; Thorpe, R. S.; Martin, A.|title=Emplacement of the Cleveland Dyke: Evidence from Geochemistry, Mineralogy, and Physical Modelling|journal=Journal of Petrology|date=1 June 1988|volume=29|issue=3|pages=559–583|doi=10.1093/petrology/29.3.559}}</ref> | |||
| * The ] complexes of the BTVP contain many examples of ] ]s found throughout the British Isles. | |||
| ==History of geological studies== | |||
| The intensity of scientific investigation within the BTVP has made it one of the most historically important and deeply studied igneous provinces in the world. Basalt petrology was born in the Scottish Hebrides in 1903 lead by the eminent British Geologist Sir ]. From the outset Geikie studied the geology of Skye and other Western Isles taking a keen interest in volcanic geology and in 1871 he presented the Geological Society of London with an outline of the 'Tertiary Volcanic History of Britain'.<ref>{{cite book|last=Geikie|first=Archibald|title=The ancient volcanoes of Great Britain|year=1897|publisher=Macmillan|location=London|url=https://archive.org/details/ancientvolcanoe02geikgoog}}</ref> Following Geikie many have tried, and continue to study and understand, the BTVP, and in doing so have advanced knowledge in geology, mineralogy and in more recent decades geochemistry and geophysics.<ref name="emeleus1992" /> | |||
| ==Synonymous or related names== | |||
| * British Tertiary Igneous Province (BTIP) | |||
| * British Paleogene Igneous Province (BPIP) | |||
| *] | |||
| *] (BAP) | |||
| * North Atlantic Igneous Province (NAIP) | |||
| * North Atlantic Tertiary Province (NATP) | |||
| * North Atlantic Volcanic Province (NAVP) | |||
| * North Atlantic Basalt Province (NABP) | |||
| * North Atlantic Tertiary Volcanic Province (NATVP) | |||
| ==References== | |||
| {{notes}} | |||
| {{clear}} | |||
| {{reflist|30em}} | |||
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