Contributing writer, Eos.org.
In 2018, Brazilian and British scientists were exploring the seafloor around a volcanic plateau known as the Rio Grande Rise when they spotted rocks that looked like they belonged on dry land.
Volcanic origins"Imagine a lush tropical island slipping beneath the waves and lying frozen in time. That's what we've uncovered," said Murton, who coauthored the study. He and colleagues think the island would have been similar in size to Iceland . "This is an outstanding result," said Luigi Jovane, a marine geologist from the University of São Paulo and coauthor of the study."The red clays are conclusive proof that this was once an island." Jovane has been leading investigations in the Rio Grande Rise for more than a decade.
Eight months later, the team returned aboard the National Oceanography Centre's RRS Discovery. That vessel is equipped with a remotely operated vehicle , which allowed them to capture footage of rocks exposed in the steep-sided canyon walls. The ROV also has a robotic arm for collecting samples. "These red clays are exactly the same, chemically and mineralogically, as the red earth or terra roxa we find all over Brazil," Jovane said."We are confident that they represent the in situ, weathered upper surfaces of the lavas."
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