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

西格陵兰岛的太古宙岩石代表了一些已知的暴露最好、研究最深入、最古老的岩石，因此构成了地壳反射研究的主要目标。这笔赠款将支持一项跨越最古老的太古代变形带的地壳反射研究。这将基于沿海岸太古宙构造走向的垂直入射海洋反射剖面和陆地上海洋气枪的广角记录。这艘船还将穿越几个海湾，发射气枪，以获得1000公里的垂直入射反射数据和广泛的广角记录，以提供非常广泛的数据集。垂直入射数据将产生构造细节，而广角数据将给出地壳速度剖面。这项研究是挪威、丹麦和美国科学家的合作项目。这项研究要解决的问题包括：1)变形带向深部延续；2)地壳缩短和变形方式；3)挥发分在地壳深部的作用；4)莫霍面深度变化；5)太古代地壳发育；6)麻粒岩下深部地壳性质；7)表壳岩石向深部延续。

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.