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: 0550743
• 负责人: William Sager
• 金额: $ 31.06万
• 依托单位: Texas A&M Research Foundation
• 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 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0550743&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已提议IODP钻探考察印度洋（查戈斯-拉卡迪夫海脊和Ninetyeast海脊）和大西洋（沃尔维斯海脊）的热点痕迹，以补充太平洋夏威夷-皇帝链（ODP 197航次）的古地磁结果。这些钻探航行将提供数据，用于重新审查这些海山链的热点模型，并测试它们是否相对于自旋轴或地幔参照系是固定的。为了收集拟议钻探计划的现场勘测数据，并检验Ninetyeast Ridge的热点假设，PI建议收集和分析地球物理数据（水深测量、磁力和地震），并从沿着5000公里长的山脊的9个地点挖掘样本。拟议的项目以46天的航行为基础，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个地点进行疏浚。这项研究既是一项现场调查（即，它提供了准备钻探所需的数据）以及一个独立的项目，以检查Ninetyeast Ridge的热点假设，这是地球的主要热点轨迹之一。 这项研究涉及研究生和本科生，涉及国际合作，并承担了热点的固定性，目前非常感兴趣。