Hotspots and Global Absolute Plate Motions

热点和全球绝对板块运动

• 批准号: 0526496
• 负责人: Paul Wessel
• 金额: $ 21.91万
• 依托单位: University of Hawaii
• 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: 2006-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0526496&HistoricalAwards=false
• 关键词: Hotspots; Global; Absolute; Plate; Motions

AbstractWessel 0526496 The hotspot hypothesis postulates that mantle plumes cause surface volcanism to form linear trains as overlying lithospheric plates move relative to the stationary or slowly moving plumes. Given geometry and ages from several trails one can construct absolute plate motions (APM) that provide valuable information about past and present tectonism, paleogeography, and volcanism. The authors have developed a hybrid technique that overcomes the limitations of absolute plate motion and relative plate motion approaches. The new technique can be derived from either stationary or moving plumes. During this project the authors will further develop their APM modeling to address a broader range of questions, in particular hotspot motion. High-resolution APM models will be determined for the key plates Pacific, Africa, and Australia, both with and without hotspot motion. This will allow an assessment of the uniqueness of the APM models and to quantify plume drift within a group as well as between groups.

热点假说假设地幔柱导致地表火山活动形成线性序列，因为上覆岩石圈板块相对于静止或缓慢移动的地幔柱运动。给定几条轨迹的几何形状和年龄，就可以构造绝对板块运动（APM），为过去和现在的构造运动、古地理和火山活动提供有价值的信息。作者开发了一种混合技术，克服了绝对板块运动和相对板块运动方法的局限性。这项新技术既可以来自静止的羽流，也可以来自运动的羽流。在这个项目中，作者将进一步发展他们的APM模型来解决更广泛的问题，特别是热点运动。将确定太平洋、非洲和澳大利亚关键板块的高分辨率APM模型，无论是否存在热点运动。这将允许对APM模型的独特性进行评估，并量化一组内以及组间的羽流漂移。