The ancient Tethys Ocean, a long-lost body of water, may have played a pivotal role in shaping Central Asia's landscape during the Cretaceous period, a time when dinosaurs roamed the Earth. This groundbreaking study, conducted by researchers at Adelaide University, challenges conventional thinking by suggesting that climate change and mantle processes were not the primary drivers of mountain formation in the region. Instead, the dynamics of the Tethys Ocean hold the key to understanding Central Asia's geological evolution.
Dr. Sam Boone, a post-doctoral researcher at Adelaide University, led the study and emphasized the ocean's influence. He stated, 'We found that climate change and mantle processes had only little influence on the Central Asian landscape, which persisted in an arid climate for much of the last 250 million years.' This revelation highlights the ocean's potential as a dominant force in shaping the region's topography.
The Tethys Ocean, which once stretched across a vast area of the planet, gradually disappeared during the Meso-Cenozoic period. Today, the Mediterranean Sea is its final remnant. The study's co-author, Associate Professor Stijn Glorie, explained that the India-Eurasia collision and ongoing convergence have largely shaped Central Asia's present-day relief. However, during the Cretaceous period, the landscape would have resembled the Basin-and-Range Province in the western USA.
The researchers propose that the extension of the Tethys Ocean, caused by the roll-back of subducting slabs of ocean crust, reactivated old suture zones into a series of roughly parallel ridges in Central Asia. This geological activity may have triggered mountain formation far from the actual plate boundaries. Thermal history models, which trace the cooling of rocks as they move closer to the Earth's surface, supported this theory.
Associate Professor Glorie noted that the same research method could be applied to other geological mysteries worldwide. For instance, the break-up of Australia from Antarctica, which occurred around 80 million years ago, has left no obvious imprint on the thermal history record of either continent. Instead, they record much older cooling histories. The team is now applying their approach to advance understanding of this event.
This study not only sheds light on Central Asia's geological past but also opens up new avenues for exploration in other regions. By unraveling the mysteries of the ancient Tethys Ocean, scientists can gain a deeper understanding of Earth's complex geological processes and their impact on our planet's ever-changing landscape.
