Mechanics of Continental Extension and Margin Formation

大陆伸展和边缘形成的机制

• 批准号: 8714004
• 负责人: Dale Sawyer
• 金额: $ 4.03万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-12-15 至 1989-08-09
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8714004&HistoricalAwards=false
• 关键词: Mechanics; Continental; Extension; Margin; Formation

The purpose of this proposal is to develop finite element models to study the effect of pre-existing zones of weakness and variations in gross mechanical properties in the continental lithosphere in controlling the continental breakup process. Two types of two-D models will be used: cross-sectional, plane-strain models to investigate the role of zones of weakness, and thin sheet models to investigate the role of along-strike variations in mechanical properties.. Total tectonic subsidence will be used to estimate the amount of pre-spreading extension of the margins of the Labrador Sea and Central Atlantic basins. Theoretcial studies such as this are important in order to understand a fundamental process in the evolution of the earths crust: how continents break apart.

这一建议的目的是开发有限元模型，以研究大陆岩石圈中先前存在的薄弱带和宏观力学性质的变化在控制大陆解体过程中的作用。将使用两种类型的二维模型：横截面、平面应变模型来研究薄弱带的作用，薄板模型来研究沿走向变化在力学性能中的作用。总的构造沉降量将被用来估计拉布拉多海和中大西洋盆地边缘的扩张前延伸量。像这样的理论研究对于理解地壳演化的一个基本过程：大陆是如何分裂的是重要的。