The Atlantic Deep Western Boundary Current During the Early Eocene Warm Period

始新世早期温暖期的大西洋深西边界流

• 批准号: 0221012
• 负责人: Brian Tucholke
• 金额: $ 50.77万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-01-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0221012&HistoricalAwards=false
• 关键词: Atlantic; Deep; Western; Boundary; Current

Award is for a seismic stratigraphic mapping and piston coring project to determine the age, configuration and paleoceanographic significance of the sedimentary sequences on J Anomaly Ridge and Southeast Newfoundland Ridge. These ridges are ideally located to record any evidence for strong boundary currents dating to the early Paleogene. Existing data show that the ridge system is draped by sedimentary sequences that record development of the boundary current during the Oligocene and Neogene, and suggest that deposition of Paleocene-Eocene sequences may have also been influenced by currents. If strong Deep Western Boundary Current or related northward flow occurred in the North Atlantic prior to the onset of extensive Antarctic glaciation in the early Oligocene, it likely affected deposition of sediment on the J Anomaly Ridge and Southeast Newfoundland Ridge. The seismic stratigraphic mapping and piston coring will test the hypothesis that the sediment sequences deposited on these ridges record strong overturning circulation in the North Atlantic prior to the onset of Antarctic glaciation.

该奖项是一个地震地层测绘和活塞取芯项目，以确定J异常脊和纽芬兰东南脊沉积序列的年龄、结构和古海洋学意义。 这些海脊的位置非常理想，可以记录下古近纪早期强边界流的任何证据。 现有的数据表明，山脊系统覆盖的沉积序列，记录在渐新世和新近纪的边界电流的发展，并建议古新世-始新世序列的沉积也可能受到电流。如果在渐新世早期广泛的南极冰川作用开始之前，北大西洋发生了强烈的深西部边界流或相关的向北流动，那么它可能会影响J异常海岭和纽芬兰东南海岭的沉积物沉积。 地震地层测绘和活塞式取芯将检验以下假设：沉积在这些海脊上的沉积物序列记录了在南极冰川作用开始之前北大西洋的强烈翻转环流。