What Determines Whether the Deep Continental Crust Flows?

是什么决定了深部大陆地壳是否流动？

• 批准号: 1219942
• 负责人: Bradley Hacker
• 金额: $ 32.97万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1219942&HistoricalAwards=false
• 关键词: What; Determines; Whether; Deep; Continental

Understanding why and how the deep continental crust flows at high temperature and pressure is central to understanding a broad range of geologic processes. There is however, uncertainty about how to quantify the influence of many factors¬-including rock composition, temperature, grain size, strain, fluid activity, and/or degree of melting. This research uses the ages and compositions of the minerals titanite, rutile and zircon to test which factors permitted or inhibited the flow of continental crust at high pressure and temperature in a well-understood part of Norway. The impact of this research should be considerable and broad because of the archetypal nature of the Norwegian terrane. Although this proposal is targeted toward understanding why the deep continental crust flows, it will also help pinpoint why mineral reactions in Earth are sometimes very slow. Answers to these questions address why Earth?s tectonic plates move, why earthquakes occur, how long mountain ranges exist, and the composition of Earth's crust. This project provides training and research for U.S. students and brings together scientists and students from the U.S., Norway, and France, providing cross-cultural experiences that ensure that the collaborative impact of this project will be long lasting. The laboratory approach in this project is relatively new and its continued development will enable further expansion into other fields, such as biology.

了解深部大陆地壳在高温高压下流动的原因和方式对于了解广泛的地质过程至关重要。然而，如何量化许多因素的影响还存在不确定性，包括岩石成分、温度、颗粒尺寸、该研究使用钛矿、金红石和锆石矿物的年龄和成分来测试哪些因素允许或抑制大陆地壳在已知部分的高压和高温下流动。由于挪威地体的典型性质，这项研究的影响应该是相当大和广泛的，尽管这项提议是为了理解为什么深层大陆地壳会流动，但它也将有助于有针对性地查明为什么地球上的矿物反应有时会非常剧烈。这些问题的答案涉及地球构造板块移动的原因、地震发生的原因、山脉存在的长度以及地壳的构成。该项目为美国学生提供培训和研究，并将来自美国的科学家和学生聚集在一起。美国、挪威和法国提供跨文化经验，确保该项目的合作影响持久。该项目的实验室方法相对较新，其持续发展将能够进一步扩展到其他领域，例如生物学。 。