Samples were collected during expeditions conducted in 2018 by researchers affiliated with the University of São Paulo and the University of Southampton . This dark-gray rock is a volcanic basalt deposit. Credit: IO-USP
An article describing the results of the study, which involved almost ten years of research, is published in the journalwith new information on the geology of the RGR, which has about the same area as Spain. “Our research and analysis enabled us to determine that it was indeed an island, and what’s now under discussion is whether the area can be included in Brazil’s legally recognized continental shelf. Geologically speaking, we discovered that the clay was formed after the last volcanic activity occurred 45 million years ago. The formation therefore dates from between 30 million and 40 million years ago.
The existence of tropical soil between the volcanic lava flows detected by the researchers shows that the rocks must have been exposed to open-air weathering in a warm-wet climate in a region with active volcanoes less than 40 million years ago. The soil is similar to the “red earth” , was 93 for the red clay. Most alkaline rocks have a CIA of less than 50.
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