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.

缅因州的诺伦贝加断裂带是一个长期以来被认为是右旋走滑断层系统的主要特征。然而，初步观测表明，北东-西南走向的断裂带代表了一个主要的跨流边界的部分地壳剖面，沿走向暴露的地壳水平存在显著差异。本项目旨在利用这一特征来表征地壳中随深度增加的变质作用和变形过程的类型。它将采用详细的测绘、岩石学和Ar/Ar年代学来限制沿四个区域或沿走向的样带的变形事件的时间。研究结果将阐明该断裂带在阿巴拉契亚造山带发育中的构造意义。