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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Paleogene opening of Drake Passage
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Paleogene opening of Drake Passage

机译：德雷克通道的古近纪开放

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摘要

The timing of events leading to the earliest connection between the Pacific and Atlantic oceans at Drake Passage is controversial but important, because gateway opening probably had a profound effect on global circulation and climate. A rigorous new analysis of marine geophysical data demonstrates a major change in the motion of the South American and Antarctic plates at about 50 Ma, from N-S to WNW-ESE, accompanied by an eightfold increase in separation rate. This would have led to crustal extension and thinning, and perhaps the opening of small oceanic basins, with the probable formation of a shallow (< 1000 in) gateway during the Middle Eocene. No change in South American-Antarctic motion is observed near the Eocene-Oligocene boundary, but a deep-water connection developed between 34 and 30 Ma, when continued extension led to the initiation of seafloor spreading at the West Scotia Ridge. These timings correlate with events seen in the oxygen isotope record from benthic foraminera, and support the view that Drake Passage opening was the trigger for abrupt Eocene-Oligocene climate deterioration and the growth of extensive Antarctic ice sheets. (c) 2005 Elsevier B.V. All rights reserved.
机译：导致德雷克海峡最早发生在太平洋和大西洋之间的事件发生的时间是有争议的，但很重要，因为门户开放可能对全球环流和气候产生深远影响。一项对海洋地球物理数据的严格的新分析表明，南美和南极板块运动从N-S到WNW-ESE在大约50 Ma时发生了重大变化，同时分离率增加了八倍。这将导致地壳扩展和变薄，甚至可能导致小型海洋盆地的开放，并可能在始新世中期形成浅（<1000 in）的通道。在始新世-渐新世边界附近没有观察到南极-南极运动的变化，但是当持续扩展导致西斯科舍海岭开始海底扩散时，在34至30 Ma之间形成了深水连接。这些时间与底栖甲胺的氧同位素记录中看到的事件相关，并支持这样的观点，即德雷克海峡通道的开启是始新世-渐新世气候恶化和南极大冰盖生长的触发因素。 （c）2005 Elsevier B.V.保留所有权利。

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