Collaborative Research: Physical Properties of Partially Molten Feldspathic Rocks in the Ocean Crust

合作研究：洋壳中部分熔融长石的物理性质

• 批准号: 9626930
• 负责人: James Hirth
• 金额: $ 8.5万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-10-15 至 1999-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9626930&HistoricalAwards=false
• 关键词: Collaborative; Research; Physical; Properties; Partially

The strength and deformation of the ocean crust depends primarily on the strength of the lower crust (oceanic layer 3) which is composed of gabbros. The strength of these rocks have not been investigated in detail and this project is designed to determine how the crust deforms when it is under pressure and when it is partially molten. These results may explain why some mid-ocean ridges have large axial valleys while others do not. The presence of melt also affects the velocity of seismic waves and the viscosity of gabbro depends on the amount of melt present and how it is distributed in the rock. This study is designed to make these measurements so that we can model the deformation of the ocean crust and the velocity of seismic waves.

大洋地壳的强度和变形主要取决于由辉长岩组成的下地壳（大洋层3）的强度。 这些岩石的强度还没有被详细研究，这个项目的目的是确定地壳在压力下和部分熔融时如何变形。 这些结果可以解释为什么一些洋中脊有大的轴向谷，而另一些则没有。 熔体的存在也会影响地震波的速度，辉长岩的粘度取决于熔体的存在量及其在岩石中的分布。 这项研究旨在进行这些测量，以便我们能够模拟海洋地壳的变形和地震波的速度。