North American Apparent Polar Wander and Rotation of the Colorado Plateau

北美表观极地漂移和科罗拉多高原的自转

• 批准号: 8708159
• 负责人: Maureen Steiner
• 金额: $ 7.71万
• 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: 1987-07-15 至 1990-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8708159&HistoricalAwards=false
• 关键词: North; American; Apparent; Polar; Wander

Accurate reference pole information from stable cratonic areas are critical in paleomagnetic interpretations of rotation and translation. The fact that the Colorado Plateau has rotated with respect to the North American craton affects the reliability of one-third of the paleopoles used to define the apparent polar wander curve. The amount of rotation is not well defined, and recently acquired evidence suggests that two rotations, rather than one, occurred; both of these factors limit the accuracy with which the Colorado Plateau paleopoles can be corrected to be representative of North America. Omission of these one third of North American paleopoles leaves uncertainties and gaps in the apparent polar wander curve. This project will sample three formations from which important poles can be acquired with relative ease and minimal uncertainty. These are the Early Permian Cutler Formation of the Colorado Palateau and the Late Jurassic Morrison and Middle Triassic Santa Rosa Formations of the craton. Acquisition of these poles addresses the amount and number of rotations of the plateau and the lack of data from certain time periods.

从稳定的电磁波区域得到的精确参考极信息是 在古地磁学对旋转和平移的解释中至关重要。 事实上，科罗拉多高原已经相对于北方旋转 美洲克拉通影响了三分之一古极点的可靠性 用于定义视极移曲线。 旋转量 没有很好的定义，最近获得的证据表明，两个 旋转，而不是一个，发生;这两个因素限制了 准确性，科罗拉多高原古极点可以纠正， 代表北美。 遗漏这三分之一 北美古极点留下的不确定性和差距， 极移曲线 该项目将从三个地层中取样， 哪些重要极点可以相对容易地获得， 不确定性 这些是早二叠世卡特勒组 科罗拉多-Palateau和晚侏罗世莫里森-中三叠世 克拉通的圣罗莎地层。 收购这些极点 解决了高原的旋转量和旋转次数， 特定时间段的数据。