Volcanic rocks are a threat for Earth

London: Greenhouse gas emissions directly from the movement of volcanic rocks can create massive global warming effects -- more than previously believed -- according to a study which may lead to changes in the way scientists estimate climate change. The study, published in the journal Nature Communications, noted that changes in the planet's geology caused the largest temporary global warming of the past 65 million years, based on scientists' calculation of how carbon-based greenhouse gas levels linked to movements of magma below the Earth's surface.

The researchers, including those from the University of Birmingham in the UK, said one such role in climate change could be played by Large Igneous Provinces (LIPs) -- extremely large accumulations of rocks forming when magma travelled through the crust towards the surface.

They created a model of changes in carbon emissions during the Paleocene-Eocene Thermal Maximum (PETM) - a short interval of maximum temperature lasting around 100,000 years some 55 million years ago.

As part of the study, the researchers calculated the greenhouse gas fluxes associated with the North Atlantic Igneous Province (NAIP) - one of Earth's largest LIPs that spans Britain, Ireland, Norway and Greenland.

"We calculated carbon-based greenhouse gas fluxes associated with the NAIP - linking measurements of the process that generated magma with observations of the individual geological structures that controlled gas emissions. These calculations suggest the NAIP caused the largest transient global warming of the past 65 million years," said study co-author Stephen Jones, a lecturer at the University of Birmingham.

"Large Igneous Provinces are linked to spikes of change in global climate, ecosystems and the carbon cycle throughout Mesozoic time - coinciding with the Earth's most devastating mass extinctions and oceans becoming strongly depleted of oxygen," he explained. According to Jones, more measurements about the planet's geology are required to reduce the uncertainty range of emissions models.

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