Ancient seafloor discovered deep underground

Researchers from the University of Maryland have uncovered an ancient seafloor buried more than 400 kilometers beneath the Earth's surface, dating back to the time of the dinosaurs. This discovery may reshape understanding of how the Earth's interior has changed over millions of years.

Seismic imaging reveals hidden structures

The finding was made using seismic imaging, a technique that maps the Earth's interior by analyzing how seismic waves travel through different layers. The team identified a dense layer in the mantle transition zone, which they believe is the remains of a seafloor that sank 250 million years ago.

Subduction process explains how plates move

Subduction is a geological process where one tectonic plate slides beneath another, often forming mountains, volcanoes, and earthquakes. This newly discovered seafloor suggests that some parts of these submerged plates may remain trapped in the mantle rather than reaching the Earth's core.

Fossilized plate hints at slower movement

The ancient plate found is unusually thick and colder than surrounding mantle material, which may slow its movement. This finding challenges existing theories about how tectonic plates interact with the Earth's interior and suggests the process is more complex than previously believed.

Insights into Earth's internal dynamics

The discovery could help scientists better understand how the Earth's interior influences surface phenomena like earthquakes and volcanoes. It also has implications for studying other rocky planets like Mars and Venus, as it may improve models of planetary evolution.

Clues about ancient oceans and climate

The subducted seafloor may contain sediments rich in carbon and water, which could have remained trapped in the mantle for hundreds of millions of years. Studying these remnants may reveal how ancient oceans contributed to Earth's climate and geochemical cycles over time.