Scientists in
Chile and other countries postulated that the boundary between the southeastern
Pacific Ocean and the southwestern
Atlantic Ocean was not the
Cape Horn meridian, but rather the Shackleton fracture zone
mid-oceanic ridge The researchers Juan Ignacio Ipinza Mayor and Cedomir Marangunic Damianovic put forward the scientific theory that the separation of the
Pacific and
Atlantic Ocean oceans "could be confirmed from the so-called Shackleton Fracture Zone (...) the boundary is then located east of the so-called Cape Horn Meridian". In 2019, the scientific journal
Geology is News published "The SFZ separates tectonic plates and oceans, to the east the Scotia plate and to the west the Antarctic plate (which includes the former Phoenix plate), and to the west the Pacific Ocean and to the east the Atlantic Ocean." In 2004 The Geological Society of America in the scientific paper entitled
Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation posits that: "the Shackleton Fracture Zone could have blocked the gateway until the early Miocene. Geophysical and geochemical evidence presented here suggests that the Shackleton Fracture Zone is an oceanic transverse ridge". ==See also==