• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bollettino della Unione matematica italiana, B >Gateways and climate: the Drake Passage opening
【24h】

Gateways and climate: the Drake Passage opening

机译：通道与气候：德雷克通道开放

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Oligocene opening of the Drake Passage between the southern tip of South America and the Antarctic Peninsula, and the subsequent evolution of the Scotia plate, have definitively separated Antarctica from the other continental masses, and have created conditions for the development of the Antarctic Circumpolar Current. This annular water flow has had a profound influence on the global climate system because it has allowed the free transfer of water masses between the Pacific and Atlantic Oceans at mid to high southerly latitudes. The comparative seismic analysis of the passive margins of the western sector of the Scotia plate, represented by the Tierra del Fuego continental margin to the north, and by the Terror Rise to the south, has shown significant morphological and structural similarities between these two margins, supporting the interpretation that they were conjugate before the Drake Passage opened. Moreover, the identification of the oldest magnetic anomalies present at the base of the two margin pairs, corresponding to about 32 million years ago, has allowed the reconstruction, through time, of the relative positions of the two continental margins, and to constrain the events that occurred immediately after the break-up and opening of the Drake Passage. These timings correlate with events seen in the oxygen isotope record from benthic foraminera, and support the view that the Drake Passage opening was the trigger for abrupt Eocene-Oligocene climate deterioration and the growth of extensive ice sheets on the Antarctic continent.
机译：南美洲南端和南极半岛之间的德雷克河道的渐新世开放，以及随后的斯科舍板块的演化，已经使南极洲与其他大陆块完全分离，并为南极绕极洋流的发展创造了条件。 。这种环形水流对全球气候系统产生了深远的影响，因为它允许水质在南纬中高纬度地区之间在太平洋和大西洋之间自由转移。对Scotia板块西段被动边缘的比较地震分析，以北部的Tierra del Fuego大陆边缘和南部的Terror Rise代表，显示出这两个边缘之间在形态和结构上有很大相似之处，支持在德雷克通道开放之前它们是共轭的解释。此外，对两个边缘对的底部存在的最古老的磁异常的识别（对应于大约3200万年前），可以通过时间重建两个大陆边缘的相对位置，并限制了这些事件。这是在德雷克通道破裂和开放后立即发生的。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，即德雷克通道的开放是始新世-渐新世气候恶化和南极大陆上大量冰盖生长的触发因素。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号