The geology of Brazil’s volcanic Trindade Island has fascinated scientists for years, but the discovery of rocks made from plastic debris in this remote turtle refuge is sparking alarm.
elted plastic has become intertwined with rocks on the island, which researchers say is evidence of humans’ growing influence over the earth’s geological cycles.
“This is new and terrifying at the same time, because pollution has reached geology,” said Fernanda Avelar Santos, a geologist at the Federal University of Parana.
Ms Santos and her team ran chemical tests to find out what kind of plastics are in the rocks called “plastiglomerates” – because they are made of a mixture of sedimentary granules and other debris held together by plastic.
“We identified (the pollution) mainly comes from fishing nets, which is very common debris on Trinidade Island’s beaches,” Ms Santos said.
“The (nets) are dragged by the marine currents and accumulate on the beach. When the temperature rises, this plastic melts and becomes embedded with the beach’s natural material.”
Trindade Island is one of the world’s most important conservation spots for green turtles, or Chelonia mydas, with thousands arriving each year to lay their eggs.
“The place where we found these samples (of plastic) is a permanently preserved area in Brazil, near the place green turtles lay their eggs,” Ms Santos said.
“The pollution, the garbage in the sea and the plastic dumped incorrectly in the oceans is becoming geological material ... preserved in the earth’s geological records.”