Geologists Uncover Geothermal Energy Potential in South Africa

  • The discovery of gases released from deep beneath the earth’s crust could help to explain Southern Africa’s unusual landscape, a study suggests.
  • Scientists have long puzzled over why areas such as South Africa’s Highveld region are so elevated and flat, with unexpectedly hot rocks below the surface.
  • Geologists have revealed that carbon dioxide-rich gases bubbling up through natural springs in South Africa originate from a column of hot, treacle-like material – called a hotspot – located deep inside the earth.

In South Africa, the hotspot pushes the crust upwards, generating the distinctive landscape, which consists mostly of tablelands more than one kilometre above sea level, the researchers say.

This also explains why rocks beneath the region are hotter than expected – a property that could be harnessed to generate geothermal energy.

A team led by scientists from the University of Edinburgh analysed the chemical make-up of gas emerging from a deep crack in the earth’s crust located in KwaZulu-Natal, South Africa.

They found that variants of helium and neon present in the gas match the composition of a rocky layer 1,000 km below earth’s surface – called the deep mantle.

The findings provide the first physical evidence that Southern Africa lies on top of a plume of the abnormally hot mantle, which had until now only been theorised using computer modelling of seismic data.

The study, published in the journal Nature Communications, was funded by the Engineering and Physical Sciences Research Council and the Natural Environment Research Council.

The research was completed with support from Scottish Carbon Capture and Storage and the UK Carbon Capture and Storage Research Centre.

It also involved scientists from the Universities of Aberdeen and Strathclyde, Scottish Universities Environmental Research Centre, British Geological Survey and South Africa Council for Geoscience.

Dr Stuart Gilfillan, of the University of Edinburgh’s School of GeoSciences, who led the study, said: “The high relief and hotter than expected subsurface temperatures of the rocks beneath Southern Africa had been a puzzle for geologists for many years.

“Our findings confirm that carbon dioxide gas at the surface is from a deep mantle plume, helping to explain the regions unusual landscape.”

The study is available here

Author: Babalwa Bungane

This article was originally published on ESI Africa and is republished with permission with minor editorial changes.

Leave A Reply

About Author

Green Building Africa promotes the need for net carbon zero buildings and cities in Africa. We are fiercely independent and encourage outlying thinkers to contribute to the #netcarbonzero movement. Climate change is upon us and now is the time to react in a more diverse and broader approach to sustainability in the built environment. We challenge architects, property developers, urban planners, renewable energy professionals and green building specialists. We also challenge the funding houses and regulators and the role they play in facilitating investment into green projects. Lastly, we explore and investigate new technology and real-time data to speed up the journey in realising a net carbon zero environment for our children.

Copyright Green Building Africa 2024.