Ancient Volcanic Formations Beneath UK Identified As Potential 38-Billion-Ton Permanent Carbon Storage Solution

University of Edinburgh researchers identify ancient UK volcanic rocks as a massive carbon sink, capable of locking away 45 years of industrial emissions.

By: AXL Media

Published: May 2, 2026, 5:51 AM EDT

Source: Information for this report was sourced from the University of Edinburgh and Earth.com.

The Geological Backstop For Industrial Emissions

A comprehensive geological survey led by Angus W. Montgomery at the University of Edinburgh has identified a massive, untapped carbon storage resource located in ancient volcanic rocks beneath the United Kingdom. These formations, particularly those rich in iron and magnesium, possess the chemical properties necessary to convert captured carbon dioxide (CO2) into stable, solid minerals. According to the research published in May 2026, the onshore geology of the UK could serve as a long-term sink for industries that currently struggle to eliminate emissions through traditional decarbonization methods. The study reframes these ancient lava flows not just as relics of the past, but as a critical "backstop" for the nation's future environmental strategy.

The Chemistry Of Carbon Mineralization

The process, known as carbon mineralization, involves dissolving captured CO2 in water and pumping the resulting fluid into the cracks and connected pores of mafic volcanic rocks. Once underground, the dissolved carbon reacts with the iron and magnesium in the rock to form carbonate minerals, essentially "hardening" the gas into stone. This method significantly reduces the risks associated with traditional gas-phase storage, where CO2 remains in a buoyant state and requires a perfectly sealed caprock to prevent leaks. By turning the carbon into a solid mineral, the UK can ensure that captured emissions remain sequestered for geological timescales without the need for indefinite monitoring.

Identifying The Highest-Capacity Targets

The research highlighted three primary regions with the highest potential for sequestration: Northern Ireland, northwest England, and western Scotland. The Antrim Lava Group in Northern Ireland emerged as the most significant target, with a median storage estimate of 1.4 billion tons and a theoretical maximum of 17 billion tons. Two other major formations in England and Scotland were estimated to hold approximately 700 million and 600 million tons, respectively. These regions are particularly attractive because their chemistry closely mirrors that of proven basalt storage sites in other parts of the world, pairing vast volumes with high chemical reactivity.