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Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation

AutorLivermore, Roy; Eagles, Graeme; Peter Morris, Peter; Maldonado, Andrés
Palabras claveGateways
Southern Ocean
Antarctic Circumpolar Current
Shackleton Fracture Zone
Transverse ridge
Fecha de publicaciónsep-2004
EditorGeological Society of America
CitaciónGeology 32(9): 797-800 (2004)
ResumenThe opening of Southern Ocean gateways was critical to the formation of the Antarctic Circumpolar Current and may have led to Cenozoic global cooling and Antarctic glaciation. Drake Passage was probably the final barrier to deep circumpolar ocean currents, but the timing of opening is unclear, because 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, formed by uplift related to compression across the fracture zone since ca. 8 Ma. Hence, there was formerly (i.e., in the Miocene) no barrier to deep circulation through Drake Passage, and a deep-water connection between the Pacific and Atlantic Oceans was probably established soon after spreading began in Drake Passage during the early Oligocene.
Versión del editorhttp://dx.doi.org/10.1130/G20537.1
URIhttp://hdl.handle.net/10261/18847
DOI10.1130/G20537.1
ISSN1553-040X
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