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: 9219549
• 负责人: Allan Ludman
• 金额: $ 5.78万
• 依托单位: CUNY Queens College
• 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 1996-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9219549&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Norumbega断层区是长期以来被认为是右旋滑动断层系统的主要功能。 但是，初步观察结果表明，NE-SW醒目的断层区代表了主要的跨界边界的部分地壳特征，其沿罢工暴露的地壳水平显着不同。 该项目的目的是利用此功能来表征变质和变形过程的风格，地壳的深度增加。 它将采用详细的映射，岩石学和AR/AR地质学来限制沿四个区域的变形事件的时机或沿罢工沿横断面的时间。 结果将阐明该断层区在阿巴拉契亚造山基因的发展中的构造意义。