ICELAND may be the tip of a gigantic, sunken continent called Icelandia, according to research.
An international team of geologists say the sub-aquatic land could stretch from Greenland all the way to Europe.
It is believed to cover an area of around 600,000 square kilometres – roughly the size of Texas.
However, when adjoining areas west of Britain are included in a “Greater Icelandia”, the region could measure one million square kilometres – an area bigger than Australia.
If proven, it means that the giant supercontinent of Pangaea, which included all of Earth’s landmass and is thought to have broken up over 50million years ago, has in fact not fully disbanded.
This new theory challenges long-held scientific ideas around the extent of oceanic and continental crust in the North Atlantic region, and how volcanic islands, like Iceland, formed.
The presence of continental, rather than oceanic, crust could also spark discussions about a new source of minerals and hydrocarbons, both of which are contained in continental crust.
The work could also have important legal and political consequences, too.
Under certain conditions, the United Nations Convention on the Law of the Sea grants coastal states exclusive rights to the non-living resources of their adjacent seabed.
That’s if scientists can prove that the seabed is a submerged extension of the continental landmass.
Professor Gillian Foulger, Emeritus Professor of Geophysics in the Department of Earth Sciences at Durham University and a world-leading geologist, led the study.
The findings have unveiled in a new book, “Footsteps of Warren B. Hamilton: New Ideas in Earth Science”, published by the Geological Society of America.
Professor Foulger said: “Until now Iceland has puzzled geologists as existing theories that it is built of, and surrounded by, oceanic crust are not supported by multiple geological data.
“For example, the crust under Iceland is over 40km thick – seven times thicker than normal oceanic crust. This simply could not be explained.
“However, when we considered the possibility that this thick crust is continental, our data suddenly all made sense.
“This led us immediately to realise that the continental region was much bigger than Iceland itself – there is a hidden continent right there under the sea.”
She added: “There is fantastic work to be done to prove the existence of Icelandia but it also opens up a completely new view of our geological understanding of the world. Something similar could be happening at many more places.
“We could eventually see maps of our oceans and seas being redrawn as our understanding of what lies beneath changes.”
The research team is now working with collaborators from across the globe on work to test their theory, which will begin once Covid-19 restrictions allow.
This work could involve electrical conductivity surveys, and the collection of zircon crystals in Iceland and elsewhere.
Other tests such as seismic profiling and drilling would need millions of pounds to fund, but such is the importance of this work that funding may well be forthcoming.
Professor Philip Steinberg, Director of IBRU, Durham University’s Centre for Borders Research, added: “Countries around the world are spending enormous resources conducting subsea geologic research in order to identify their continental shelves and claim exclusive mineral rights there.
“Research like Professor Foulger’s, which forces us to rethink the relationship between seabed and continental geology can have far-reaching impact for countries trying to determine what area of the seabed are their exclusive preserve and what areas are to be governed by the International Seabed Authority as the ‘common heritage of humankind.”
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