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Share The extrusion of fresh ocean crust at midocean ridges began to slacken 15 million years ago, perhaps cooling the planet. geogphotos/Alamy Stock Photo Slowdown in plate tectonics may have led to Earth’s ice sheets Dec. 22, 2020 , 11:05 AM In seafloor trenches around the world, slabs of old ocean crust fall in slow motion into the mantle, while fresh slabs are built at midocean ridges, where magma emerges at the seams between separating tectonic plates. The engine is relentless but maybe not so steady: Beginning about 15 million years ago, in the late Miocene epoch, ocean crust production declined by one-third over 10 million years to a slow pace that pretty much continues to today, says Colleen Dalton, a geophysicist at Brown University who presented the work this month at a virtual meeting of the American Geophysical Union. “It’s a global phenomenon.”

Saint petersburgSankt peterburgUnited statesColleen daltonNicholas swanson hysellPacific oceanPaul voosenSergey merkuryevClint conradCharles demetsKarin siglochUniversity of wisconsinUniversity of californiaUniversity of oxfordBrown universitySaint petersburg state university