Technomagmatic Processes During Continental Rifting and the Formation and Stucture of the Ocean-Continent Transition on Rifted Continential Margins

大陆裂谷过程中的技术岩浆过程以及裂谷大陆边缘洋陆过渡带的形成和结构

• 批准号: 9906889
• 负责人: Dennis Harry
• 金额: $ 12.51万
• 依托单位: University of Alabama Tuscaloosa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2003-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9906889&HistoricalAwards=false
• 关键词: Technomagmatic; Processes; During; Continental; Rifting

Funds are provided for a geodynamic modeling study of associations between magmatism and extension on rifted continental margins. The research will focus on understanding the tectonomagmatic history of the crust in the ocean-continent transition zone and the transition from continental rifting to steady state seafloor spreading. Preliminary modeling by the PI suggest that intra-lithospheric processes may be a key to understanding the differences between volcanic rifted margins and non-volcanic rifted margins and the formation of crust at the ocean-continent transition. Proposed research will extend the study in three stages: development of a series of dynamic models of lithospheric extension; development of a quasi-dynamic modeling technique in which simple shear is approximated kinematically; and the application of the models of lithospheric deformation to define an upper boundary condition to be applied to a series of models that investigate convection and melting processes in the asthenosphere. Data from the Iberian and Grand Banks conjugate margins will be use to constrain the models.

为岩浆活动与大陆裂谷边缘伸展之间关系的地球动力学模拟研究提供了资金。这项研究将侧重于了解大洋-大陆过渡带地壳的构造-岩浆历史，以及从大陆裂谷到海底稳定扩张的转变。PI的初步模拟表明，岩石圈内的过程可能是理解火山裂谷边缘和非火山裂谷边缘之间的差异以及大洋-大陆转换时地壳形成的关键。拟议的研究将分三个阶段展开：开发一系列岩石圈伸展动力学模型；开发一种从运动学上近似简单剪切的准动态建模技术；以及应用岩石圈变形模型来确定上边界条件，该上边界条件将应用于研究软流圈对流和熔融过程的一系列模型。来自伊比利亚银行和大银行共轭边际的数据将被用来限制模型。