Collaborative Research: Geophysical, Geochemical and Geochronological Site Survey of the Ninetyeast Ridge - Testing Hotspot Hypotheses

合作研究：九十东岭的地球物理、地球化学和地质年代学现场调查 - 检验热点假设

• 批准号: 0549852
• 负责人: Frederick Frey
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0549852&HistoricalAwards=false
• 关键词: Collaborative; Research; Geophysical; Geochemical; Geochronological

The PIs have proposed IODP drilling expeditions to hotspot traces in the Indian Ocean (Chagos-Laccadive and Ninetyeast ridges) and Atlantic (Walvis Ridge) to complement paleomagnetic results from the Hawaiian-Emperor chain in the Pacific (ODP Leg 197). These drilling cruises will provide data for re-examining hotspot models for these seamount chains as well as testing whether or not they are fixed relative to the spin axis or mantle reference frames. To collect site survey data for the proposed drilling program and to test the hotspot hypothesis for Ninetyeast Ridge, the PIs propose the collection and analysis of geophysical data (bathymetry, magnetic and seismic) and dredge samples from nine sites along the 5000-km long ridge. The proposed project is based upon a 46-day cruise that will collect multibeam bathymetry, magnetic, and seismic data at 5 sites as well as dredges at these sites and 4 others. The study is both a site survey (i.e., it provides the required data to prepare for drilling) as well as a stand-alone project to examine the hotspot hypothesis for Ninetyeast Ridge, which is one of the Earths primary hotspot tracks. The study involves graduate and undergraduate students, involves international collaboration, and bears on the fixity of hotspots, of great current interest.

PI 提议对印度洋（查戈斯-拉卡迪夫海脊和九十东海脊）和大西洋（沃尔维斯海脊）的热点痕迹进行 IODP 钻探考察，以补充太平洋夏威夷-皇帝链（ODP Leg 197）的古地磁结果。这些钻探巡航将为重新检查这些海山链的热点模型以及测试它们是否相对于自转轴或地幔参考系固定提供数据。为了收集拟议钻探计划的现场调查数据并测试九十东岭的热点假说，PI 建议收集和分析地球物理数据（测深、磁力和地震），并从 5000 公里长的山脊沿线的 9 个地点挖掘样本。拟议项目基于为期 46 天的巡航，将在 5 个地点收集多波束测深、磁力和地震数据，并在这些地点和其他 4 个地点收集挖泥机数据。该研究既是一项现场调查（即提供钻探所需的数据），也是一个独立项目，旨在检验九十东岭的热点假说，九十东岭是地球的主要热点轨道之一。 该研究涉及研究生和本科生，涉及国际合作，涉及当前热点的固定性。