COLLABORATIVE RESEARCH: Crustal Profile of a Major Transpressional Boundary: Tectonic Evolution of the Norumbega Fault Zone, Maine

合作研究：主要变形边界的地壳剖面：缅因州诺伦贝加断裂带的构造演化

• 批准号: 9218833
• 负责人: Mary Hubbard
• 金额: $ 11.69万
• 依托单位: University of Maine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-01 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218833&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Crustal; Profile; Major

The Norumbega Fault Zone in Maine is a major feature long considered to be a dextral strike-slip fault system. Preliminary observations suggest however that the NE-SW striking fault zone represents a partial crustal profile of a major transcurrent boundary, with significantly different crustal levels exposed along strike. This project is aimed at taking advantage of this feature to characterize the styles of metamorphism and deformation processes with increasing depth in the crust. It will employ detailed mapping, petrology and Ar/Ar geochronology to constrain timing of deformation events, along four areas or transects along strike. Results will elucidate the tectonic significance of this fault zone in the development of the Appalachian orogen.

缅因州的诺伦贝加断层带是一个主要特征 长期以来被认为是右旋走滑断层系统。 然而，初步观察表明，东北-西南 断裂带代表了地壳的部分剖面， 一个主要的横向边界， 沿走向沿着暴露的地壳水平。 该项目旨在 在利用这一特点来表征 变质作用和变形作用的类型， 地壳深度不断增加 它将使用详细的 填图、岩石学和Ar/Ar年代学来约束 变形事件的时间，沿着四个区域或断面 沿着罢工。 结果将阐明构造 这条断裂带的重要性， 阿巴拉契亚造山带