Crustal Reflection Profiling Across Oldest Archean Crust and Crustal Sutures in West Greenland

格陵兰岛西部最古老的太古代地壳和地壳缝合线的地壳反射剖面

• 批准号: 8821974
• 负责人: Scott Smithson
• 金额: $ 27.11万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-04-15 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8821974&HistoricalAwards=false
• 关键词: Crustal; Reflection; Profiling; Across; Oldest

The Archean rocks of West Greenland represent some of the best- exposed, best-studied, oldest rocks known and thus constitute a prime target for crustal reflection studies. This grant will support a crustal reflection study across the oldest Archean deformation zone. This will be based on vertical-incidence marine reflection profiling across the strike of Archean structures along the coast and wide-angle recording of the marine air guns on land. The ship will also traverse several fjords firing the air guns to also obtain 1000 km if vertical-incidence reflection data and extensive wide angle recording to give a very extensive data set. The vertical incidence data will produce structural detail and the wide-angle data will give crustal velocity profiles. The research is a cooperative project between Norwegian, Danish, and U.S. scientists. Problems to be attacked by this research include: 1) continuation of the deformation zone to depth; 2) crustal shortening and mode of deformation, 3) role of volatiles in the deep crust, 4) change in Moho depth, 5) Archean crustal development, 6) nature of deep crust under granulites, and 7) continuation of supracrustal rocks to depth.

西格陵兰的太古代岩石代表了一些最好的- 暴露的，最好的研究，已知的最古老的岩石，因此构成了一个 地壳反射研究的主要目标。 这笔赠款将 支持对最古老的太古代的地壳反射研究 变形带 这将基于垂直入射 太古界走向海洋反射剖面 沿着构造和海洋的广角记录 陆地上的气枪 该船还将穿越几个峡湾 发射气枪也获得1000公里，如果垂直入射 反射数据和广泛的广角记录， 广泛的数据集。 垂直入射数据将产生 结构细节和广角数据将提供地壳 速度剖面 该研究是一个合作项目， 挪威、丹麦和美国科学家。 需要解决的问题 主要包括：1）变形的延续 地壳缩短和变形方式; 挥发分在地壳深部的作用，4）莫霍面深度的变化，5） 太古宙地壳的发展; 6）地壳深部的性质 麻粒岩;（7）表壳岩向深部的延续。