Brazilian geologist Fernanda Avelar Santos has recently made a worrisome discovery on an otherwise untouched tropical island in the South Atlantic called Trindade, Phys.org reports.
Santos noticed plastic materials in the rocks scattered on the shore. Santos initially came upon the rocks while on a research expedition for her doctoral thesis on geological risks.
She found a massive outcropping of blue-green rocks on the island called Turtle Beach, the world's largest breeding place for the endangered green turtle.
Plastic Pollution Now Affecting Geologic Processes
Santos and her colleagues reported that people are now impacting previously purely natural processes, such as rock formation, after examining the rocks on the island.
National Geographic explains that rocks are generated by a process known as the rock cycle, which comprises a series of processes that turn one type of rock into another. There are three types of rocks in the rock cycle: igneous from volcanic activity, sedimentary from compressed materials, and metamorphic from heat, pressure, and chemical processes.
The specimens found by Santos and her team were a novel type of geological formation that combined the elements and processes the Earth has employed for billions of years to produce rocks with a new ingredient: plastic waste.
They studied the plastic debris using various ways and determined that there were many types of plastic rocks. Some were formed over rock surfaces, while others were produced from beach sediment. They also discovered that the plastic rocks were composed of two different forms of plastic: polypropylene and polyethylene.
Plastic Pollution Poses Threat to Biodiversity
Santos described Trindade as "like paradise": an island so secluded that it has become a sanctuary for many animals.
The island's only human presence is a small Brazilian military outpost and a scientific research center.
She returned to the island in 2022 to gather more specimens and research the phenomena further. Continuing her investigation, she discovered that similar rock-like plastic formations had been recorded in Hawaii, the United Kingdom, Italy, and Japan since 2014.
Nonetheless, she claims that Trindade Island is the most isolated location on the earth where they have been discovered thus far.
The major component of the rocks identified by Santos was fishing net debris. So far, ocean currents have brought a profusion of bottles, household waste, and other plastic litter from all over the world to the island.
She is concerned that microplastics may be released into the ecosystem when the rocks degrade, contaminating the island's food chain.
The work by Santos and her colleagues, published in the journal Marine Pollution Bulletin, demonstrates that marine pollution is causing a paradigm shift in the formation of rock and sedimentary deposits.
Human interference has become so prevalent that it is difficult to determine what is genuinely natural. Santos stated that she intends to make the issue her primary study focus.
In a nutshell, Santos' research reveals that plastic pollution is a major issue that is beginning to influence natural systems.