Stephanie Pappas is a contributing writer for Live Science, covering topics ranging from geoscience to archaeology to the human brain and behavior. She was previously a senior writer for Live Science but is now a freelancer based in Denver, Colorado, and regularly contributes to Scientific American and The Monitor, the monthly magazine of the American Psychological Association. Stephanie received a bachelor's degree in psychology from the University of South Carolina and a graduate certificate i
A long-lost tectonic plate that once underpinned what is today the South China Sea has been rediscovered 20 million years after disappearing.
Van de Lagemaat and her colleagues were initially studying the Pacific plate under the Pacific Ocean. Tectonic plates constantly move against one another, and the crust in oceanic plates is more dense than continental plates, so oceanic plates get pushed under continental plates in a process called subduction and disappear. Sometimes, however, rocks from a lost plate get incorporated into mountain-building events. These remnants can point to the location and formation of ancient plates.
To unravel the mystery, she used computer models to investigate the region's geology over the last 160 million years. The plate reconstruction showed a hiccup between what is now South China and Borneo — an ocean once thought to be underpinned by another ancient plate called the Izanagi plate actually wasn't on that plate. Instead, the Borneo rocks fitted into that mystery gap.
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