Structural History of the Arctic Margin of Eastern Alaska and Northwestern Canada and its Implication on Evolution of the Canada Basin

人们对加拿大盆地的构造史知之甚少，而阿拉斯加和加拿大西北部北极边缘的中生代历史对这一问题至关重要。来自加拿大盆地洋壳的磁性数据含糊不清，无法区分(1)阿拉斯加北缘围绕新的麦肯齐三角洲的自转极远离加拿大北极群岛的逆时针造山斜向旋转，(2)允许阿拉斯加北部向南迁移的主要左旋转换断层。这两个模型预测了东部布鲁克斯山脉、麦肯齐三角洲和黑河-奥格里维山脉地区中生代不同的构造体制。该项目将通过对豪猪河断裂系统及其邻近地区的构造和运动学研究来解决这一问题。从前寒武纪到新生代岩石，叠加构造几何形状的空间变化将被记录下来，变形年龄都是根据地层和火成岩侵入关系确定的。这一研究成果将提高我们对加拿大盆地及邻近北极地区构造演化的认识，也将对该地区的石油勘探具有现实意义。

The tectonic history of the Canada Basin is poorly understood and the Mesozoic history of the Arctic margin of Alaska & NW Canada is critical to this problem. Magnetic data from the oceanic crust of Canada Basin are ambiguous and cannot distinguish between (1) anticlockwise oroclinal rotation of the northern margin of Alaska away from the Canadian Arctic Islands about a pole of rotation new the MacKenzie delta, and (2) a major left-lateral transform fault to permit the southerly migration of northern Alaska. The two models predict different structural regimes for the eastern Brooks Range, MacKenzie delta, and Black River-Oglivie Mountains regions during the Mesozoic this project will address the problem by structural and kinematic studies along the Porcupine River fault system and adjacent areas. Spatial variations in the geometry of superposed structures will be documented from Precambrian through Cenozoic rocks, and ages of deformation all be established from stratigraphic and igneous intrusion relationships. The results of this study will improve our understanding of the tectonic evolution of the Canada Basin and the adjacent Arctic region, and will also have relevance to oil exploration in the area.