Investigation of Mid Paleozoic Apparent Polar Wander for North America and the Influence of Major Orogenic Events

北美中古生代视极地漂移及重大造山活动的影响研究

• 批准号: 8904257
• 负责人: Peter Plumley
• 金额: $ 7.15万
• 依托单位: Syracuse University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-06-01 至 1991-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8904257&HistoricalAwards=false
• 关键词: Investigation; Mid; Paleozoic; Apparent; Polar

Paleozoic plate reconstructions rely on apparent polar wander paths for continental blocks as determined by paleo- magnetic records from strata in stable cratonic areas. By comparison of paleomagnetic records from different blocks, latitudinal separations can be determined. Currently, due to the widespread presence of younger overprints, a large and tectonically important gap exists in the mid Paleozoic APWP record of the Early and Middle Devonian of North America. To fill this gap and to avoid overprints (commonly associated with magnetite), a sampling program for fossiliferous limestones and red dolomites that outcrop between Iowa and the Northwest Territories of Canada will be conducted. Results should help establish a reliable APWP for cratonic North America for this interval.

古生代板块的重建依赖于大陆地块的视极移轨迹，这是由稳定克拉通地区地层的古磁记录确定的。通过对比不同地块的古地磁记录，可以确定纬向的分离。目前，由于年轻叠置的广泛存在，北美早、中泥盆世的中古生代APWP记录中存在着一个巨大的构造意义上的空白。为了填补这一空白并避免套印(通常与磁铁矿有关)，将对爱荷华州和加拿大西北地区之间露出的石灰岩和红色白云岩进行采样。研究结果应有助于建立北美克拉通地区这段时间的可靠的全球变暖潜势。