RUI: Deep Crustal Earthquakes and Metamorphic Phase Transitions: Direct Observations from Exposed Fault Systems in Western Norway

RUI：深地壳地震和变质相变：挪威西部暴露断层系统的直接观测

• 批准号: 9909697
• 负责人: Theresa Boundy
• 金额: $ 6.62万
• 依托单位: Ball State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909697&HistoricalAwards=false
• 关键词: RUI; Deep; Crustal; Earthquakes; Metamorphic

ABSTRACT9909697BoundyThe motivation for this study is the continuing controversy on the mechanism for generating earthquakes at depths below 50 km, where material would be expected to relieve stress by plastic flow rather than brittle failure. The recently discovered spatial relationship between partial eclogitization and pseudotachylyte of an area in western Norway provides an unusual opportunity to link localized fluid infiltration into dry granulite and resultant eclogite accompanied by 10-15% volume reduction with proxy evidence for transient high stress release (pseudotachylyte). This project will investigate the detailed relationships between eclogite, granulite and pseudotachylyte to test the concept that volume reduction due to fluid interaction along fractures is a major mechanism for deep earthquakes. Successful results are expected to be widely applicable.

本研究的动机是对在50 km以下深度发生地震的机制的持续争论，在那里材料将被期望通过塑性流动而不是脆性破坏来释放应力。 最近发现的部分榴辉岩和pseudotachylyte在挪威西部的一个地区的空间关系提供了一个不寻常的机会，链接到干麻粒岩和所产生的榴辉岩伴随着10-15%的体积减少与代理证据的瞬时高应力释放（pseudotachylyte）的局部流体渗透。 本项目将调查榴辉岩、麻粒岩和假玄武玻璃岩之间的详细关系，以检验由于流体沿沿着断裂相互作用而导致的体积减小是深源地震的主要机制这一概念。 成功的结果有望得到广泛应用。