North American APW during the Jurassic: An Answer from the Black Hills

侏罗纪时期的北美 APW：来自布莱克山的答案

• 批准号: 0073891
• 负责人: Bernard Housen
• 金额: $ 14万
• 依托单位: Western Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0073891&HistoricalAwards=false
• 关键词: North; American; APW; during; Jurassic

0073891Housen North America experienced tectonism on both east and west margins during the Mesozoic, and paleomagnetic data have been instrumental in working out past relative plate positions and relative motion. However, the apparent polar wunder path for North America, on which accurate reconstruction rely, is basically unresolved for the middle and upper Jurassic. Data from New England suggests that the APWP lies at high latitudes, but data from the Colorado Plateau indicates a significantly lower latitude APWP. This discrepancy is important, and remains unresolved because flaws exist in both data sets. This project will attempt to define the APWP for this time interval for North America by study of the Sundance and Morrison formations in the Black Hills of Wyoming and South Dakota that may have escaped the rotations and overprints affecting other regions. Results will help anchor poles of middle to upper Jurassic age for cratonic North America so that several tectonic questions can be better addressed.

0073891Housen North America在中生代期间经历了东西边缘的构造运动，古地磁数据有助于计算过去的相对板块位置和相对运动。 然而，准确重建所依赖的北美洲明显的极地奇观路径，在中侏罗世和上侏罗统基本没有解决。 来自新英格兰的数据表明 APWP 位于高纬度，但来自科罗拉多高原的数据表明 APWP 的纬度明显较低。 这种差异很重要，但由于两个数据集中都存在缺陷，因此仍未得到解决。 该项目将尝试通过研究怀俄明州和南达科他州布莱克山的圣丹斯和莫里森地层来定义北美这一时间间隔的 APWP，这些地层可能逃脱了影响其他地区的旋转和叠印。 研究结果将有助于确定北美克拉通中侏罗世中上侏罗世的极点，从而更好地解决一些构造问题。