Collaborative Research: Geophysical Constraints on Mechanisms of Ocean Plateau Formation from Shatsky Rise, Northwest Pacific

合作研究：西北太平洋沙茨基隆起海洋高原形成机制的地球物理约束

• 批准号: 0927001
• 负责人: Jun Korenaga
• 金额: $ 31.97万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0927001&HistoricalAwards=false
• 关键词: Collaborative; Research; Geophysical; Constraints; Mechanisms

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-2).Deciphering the origins of the giant large igneous provinces is a critical element for understanding mantle dynamics and its relation to terrestrial magmatism. Among a dozen or so large oceanic plateaus in the oceans Shatsky Rise is an important target because of its unique tectonic setting. It is the only giant plateau formed at a time of frequent magnetic reversal anomalies that show its relationship to coeval spreading ridges. IODP Expedition 324 is currently also scheduled to sample the sediments and upper igneous layers at five sites on Shatsky Rise in late 2009, which could provide important ground-truthing. The PIs propose a collaborative geophysical project with two foci: (1) constraining the crustal structure by an OBS reflection and refraction experiment, and (2) delineating the tectonic history by MCS profiling and reanalysis of bathymetry and magnetic data. A new model of crustal seismic structure will constrain the nature of mantle melting on the basis of correlation between thickness and velocity. The detailed upper crustal structure revealed by MCS will help to reconstruct the tectonic history of Shatsky Rise, which appears to be a huge volcano formed at a triple junction and then split apart by seafloor spreading. The PIs will synthesize the results of these geophysical studies to build a comprehensive tectonic framework, including better estimations of eruption rate, its temporal variation, its relation to ridge kinematics, and the coeval evolution of the parental mantle.International collaboration with the Japanese and Russian scientists and graduate and undergraduate students training and sea-going experience are some of the broader impacts of the study. Outreach to school students is also planned.

该奖项是根据2009年的《美国复苏与再投资法》（公法111-2）资助的。对巨大的大火成岩省份的起源是理解地幔动态及其与地面岩浆主义关系的关键因素。在海洋上升的十几个海洋高原中，Shatsky上升是一个重要的目标，因为它具有独特的构造环境。它是唯一在频繁的磁反转异常时形成的巨型高原，显示出与同时扩散山脊的关系。 IODP Expedition 324目前还计划在2009年末在Shatsky Rise的五个地点进行沉积物和上火成点进行采样，这可能会提供重要的地面助理。 PI提出了一个具有两个焦点的协作地球物理项目：（1）通过OBS反射和折射实验来限制地壳结构，以及（2）通过MCS分析和重新分析次要历史和重新分析次要历史。地壳地震结构的新模型将根据厚度和速度之间的相关性来限制地幔熔化的性质。 MC揭示的详细上层地壳结构将有助于重建Shatsky Rise的构造历史，这似乎是在三连接处形成的巨大火山，然后被海底扩散分开。 PI将综合这些地球物理研究的结果建立一个全面的构造框架，包括更好地估计喷发率，其时间变化，其与山脊运动学的关系以及父母地幔的同时演变。与日本和俄罗斯科学家的合作以及研究和毕业生的经验以及研究和海上的经验以及一些研究的经验，是一些研究的经验。还计划向学校学生推广。