Research Project
Full description This study explores how parts of the northeastern Tibetan Plateau were shaped by ancient tectonic processes more than 500 million years ago. By analyzing rocks from the South Qilian region of China, scientists reconstructed the history of a long-vanished ocean called the Proto-Tethys Ocean, which once separated blocks of continental crust. The research focuses on two key rock formations-the Liudaogou Group and the Chapu Group-that preserve records of underwater basins formed during different stages of ocean closure. These sedimentary rocks contain clues like volcanic fragments, minerals, and microscopic fossils that reveal where they came from and how they were deposited. Results show that the Liudaogou Group formed in an oceanic forearc basin, far from any continent, as a result of southward subduction-when one tectonic plate slides beneath another. Later, after a collision between oceanic and continental crust, subduction direction reversed, and a new continental arc system formed. The Chapu Group captures this change, recording sediments deposited along a newly forming continental margin. This transition from an oceanic to a continental subduction zone marks a major shift in the tectonic history of the region. It also parallels modern geologic settings like Taiwan and the Marianas, helping us better understand how mountain belts and continental crust evolve over time. By piecing together the story preserved in these ancient rocks, this study sheds light on the early formation of the Asian continent and the dynamic forces that shaped it during the Paleozoic era.