Collaborative Research: Crustal Structure and Evolution of the Newfoundland-Iberia Non-Volcanic Rift: A Seismic Study of the Newfoundland Conjugate Margin

合作研究：纽芬兰-伊比利亚非火山裂谷的地壳结构和演化：纽芬兰共轭边缘的地震研究

• 批准号: 9819053
• 负责人: Brian Tucholke
• 金额: $ 33.54万
• 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: 2000
• 资助国家: 美国
• 起止时间: 2000-02-01 至 2003-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819053&HistoricalAwards=false
• 关键词: Collaborative; Research; Crustal; Structure; Evolution

OCE 98-19053TucholkeThe recommended project is a marine geophysical field program on the Newfoundland margin, which was conjugate to the Iberia margin during the initial opening of the Atlantic ocean. The project will provide geophysical site survey data in support of JOIDES ODP Proposals 504 and 504-Full 2. It will utilize the R/V Ewing's large, tuned airgun array and 6 krn streamer together with an extensive ocean-bottom seismometer array to seismically profile three transects that extend from known continental crust to known oceanic crust. The program will be conducted jointly with Canadian and Danish Lithosphere Centre scientists. Together with other geophysical and drilling data from the Iberian margin, it will provide a critical dataset for testing models of continental rifting, breakup, and initiation of seafloor spreading in a "non-volcanic" rifted environment. Specifically, it will: 1) characterize the nature of the crust transitional between oceanic and continental crust in the region; 2) provide a comparison with the Iberian margin, thereby allowing testing of models of pure-shear vs. simple-shear during rifting; and 3) determine the amount of igneous material intruded and extruded during rifting, providing comparative data with other "volcanic" rifted margins, such as the East Greenland margin.***

OCE 98- 19053 Tucholke推荐的项目是纽芬兰边缘的海洋地球物理场计划，在大西洋最初开放期间，纽芬兰边缘与伊比利亚边缘共轭。该项目将提供地球物理现场勘测数据，以支持JOIDES ODP建议书504和504-Full 2。它将利用“尤因”号研究船的大型调谐气枪阵列和6 krn拖缆以及一个广泛的海底地震仪阵列，对从已知大陆地壳到已知大洋地壳的三个断面进行地震剖面测量。该方案将与加拿大和丹麦岩石圈中心的科学家联合进行。它将与伊比利亚边缘的其他地球物理和钻井数据一起，为测试“非火山”裂谷环境中大陆裂谷、断裂和海底扩张开始的模型提供关键数据集。具体而言，它将：1）确定该区域洋壳和陆壳之间过渡地壳的性质; 2）提供与伊比利亚边缘的比较，从而可以检验裂谷作用期间纯剪切与简单剪切的模型; 3）确定裂谷作用期间侵入和挤出的火成岩物质的数量，提供与东格陵兰边缘等其他“火山”裂谷边缘的比较数据。