Geophysical Studies of Oldest Archean Crust in West Greenland

西格陵兰岛最古老太古宙地壳的地球物理研究

• 批准号: 8619252
• 负责人: Scott Smithson
• 金额: $ 5.16万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-05-15 至 1989-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8619252&HistoricalAwards=false
• 关键词: Geophysical; Studies; Oldest; Archean; Crust

The Isua supracrustal rocks and their surrounding gneisses are among the world's oldest rocks and are truly unique for the study of continental crust. The West Greenland section also represents some of the best-exposed and best-studied Archean rocks known and thus constitute a prime target for geophysical studies. Primary objectives of this study include the Nordlandet granulite terrain, granitic and anorthositic intrusives, the gray basement gneisses, the Isua supracrustal rocks, and the crustal transition along the coast. Since geophysical interpretations for this oldest Archean crust are lacking, determination of 3-D relationships should contribute greatly to an understanding of early Earth's crustal processes. This investigation will include a gravity survey and gravity and magnetic interpretation for this area.

伊苏阿表壳岩石及其周围的片麻岩是世界上最古老的岩石之一，对于研究大陆地壳来说确实是独一无二的。西格陵兰岛段也代表了一些已知的暴露最好、研究最深入的太古宙岩石，因此构成了地球物理研究的主要目标。这项研究的主要目标包括诺德兰德麻粒岩地体、花岗岩和斜长岩侵入体、灰色基底片麻岩、伊苏瓦表壳岩石以及沿海的地壳过渡。由于缺乏对这个最古老的太古宙地壳的地球物理解释，三维关系的确定应该对了解地球早期的地壳过程有很大帮助。这次调查将包括该地区的重力测量和重磁解释。