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

阿拉斯加东部和加拿大西北部北极边缘的构造历史及其对加拿大盆地演化的意义

• 批准号: 9017835
• 负责人: John Oldow
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-03-01 至 1994-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9017835&HistoricalAwards=false
• 关键词: Structural; History; Arctic; Margin; Eastern

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.

对加拿大盆地的构造史了解甚少，而阿拉斯加和加拿大西北部北极边缘的中生代历史对这个问题至关重要。来自加拿大盆地海洋地壳的磁数据是模糊的，无法区分(1)阿拉斯加北缘的逆时针斜向旋转，远离加拿大北极群岛，大约是麦肯齐三角洲的一个旋转极，以及(2)一个主要的左旋断层，允许阿拉斯加北部向南迁移。这两种模型预测了中生代东部布鲁克斯山脉、麦肯齐三角洲和黑河-奥格利维山脉地区的不同构造状态。该项目将通过对豪猪河断层系统及其邻近地区的结构和运动学研究来解决这一问题。从前寒武纪到新生代，叠合构造的几何空间变化将被记录下来，变形的年龄将由地层和火成岩侵入关系确定。这项研究的结果将提高我们对加拿大盆地和邻近北极地区构造演化的认识，也将与该地区的石油勘探有关。