Structure of Oceanic Crust Formed at 200 mm/yr. Spreading Rate

海洋地壳的结构 以 200 毫米/年的速度形成。

• 批准号: 9811948
• 负责人: Douglas Wilson
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-10-01 至 2001-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9811948&HistoricalAwards=false
• 关键词: Structure; Oceanic; Crust; Formed; 200

Collaborative Project OCE 98-11948 Wilson OCE 98-12612 Harding The recommended project involves funds for an extensive geophysical survey of oceanic crust in the south-central Cocos Plate region, in support of ODP Proposal 522-Pre. This area of the ocean crust was formed by the fastest spreading rate ever documented by marine magnetic anomalies, with a spreading rate of about 200 mm/yr at the southern end of the Cocos-Pacific Plate boundary from 13-17 Ma. The survey will measure the basic properties of oceanic crust formed at this extraordinary spreading rate. Extrapolating observed and theoretical variations with spreading rate suggests that seismic layer 3 and the dike-gabbro transition may occur at a depth shallower than 1km. Using multi-channel seismic reflection and ocean-bottom hydrophone siesmic refraction, the structure of the upper oceanic crust will be mapped at very high resolution. Four specific areas will be targeted for detailed mapping as potential sites for future drilling by the Ocean Drilling Program. ***

合作项目OCE 98-11948 Wilson OCE 98-12612 Harding建议的项目涉及对科科斯板块中南部地区的大洋地壳进行广泛的地球物理调查的资金，以支持ODP提案522-Pre。这一区域的洋壳是由海洋磁异常记录的最快扩张速度形成的，在13-17 Ma期间，可可-太平洋板块边界南端的扩张速度约为200毫米/年。该调查将测量以这种非凡的扩张速度形成的洋壳的基本特性。外推观测和理论变化与扩展速率表明，地震层3和岩脉辉长岩过渡可能发生在浅于1 km的深度。利用多道地震反射和海底水听器地震折射，将以非常高的分辨率绘制上洋壳的结构图。将针对四个具体地区进行详细测绘，作为大洋钻探计划今后钻探的可能地点。***