In the heart of the vast Australian outback lies a geological mystery that has puzzled scientists for decades: how did huge, solid granite domes form in the hot and arid conditions of Central Australia? A new study, led by researchers at Curtin University, has delved into the secrets of these ancient rock formations, revealing the surprising role that hot water played in their creation.

The research team, led by Dr. Milo Barham from Curtin's School of Earth and Planetary Sciences, investigated the Devil's Marbles Conservation Reserve in the Northern Territory. These remarkable granite domes, also known as tors, stand tall and weathered against the horizon, capturing the imagination of visitors from around the world.

Using a combination of field observations, laboratory experiments, and computer modeling, the scientists unraveled the geological history of these enigmatic formations. They discovered that the granite domes were formed over 1.5 billion years ago, when hot water circulated through the Earth's crust.

"Imagine boiling a pot of water on a stovetop," explains Dr. Barham. "As the water boils, it creates convection currents that carry heat upwards. In the case of the Devil's Marbles, hot water circulated in a similar fashion, but within cracks and fractures in the Earth's crust."

The circulating hot water dissolved minerals from the surrounding rocks, weakening the rock structure. Over time, as more and more hot water flowed through these channels, it gradually eroded the rock, leaving behind the distinctive tors that we see today.

The study also revealed that the granite domes were formed at a relatively shallow depth, just a few kilometers below the Earth's surface. This is in contrast to other granite domes found around the world, which are typically formed at much deeper levels.

"The shallow formation of the Devil's Marbles domes is another unique aspect of these geological wonders," says Dr. Barham. "It suggests that the hot water circulation system was very efficient in removing heat and preventing the granite from cooling too quickly."

The findings of this study shed new light on the geological processes that shaped the ancient landscapes of Central Australia, providing valuable insights into the Earth's dynamic history. As we delve deeper into the mysteries of our planet, we uncover the incredible stories hidden within its rocks, reminding us of the vastness of time and the remarkable forces that have shaped our world.