Paleomagnetic Tests of the Vendian-Cambrian True Polar Wander Hypotheses

文迪安-寒武纪真实极地漂移假说的古地磁测试

• 批准号: 9814608
• 负责人: Joseph Kirschvink
• 金额: $ 4.98万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814608&HistoricalAwards=false
• 关键词: Paleomagnetic; Tests; Vendian; Cambrian; True

9814608Kirschvink Recent syntheses of the global paleomagnetic database for Vendian and Cambrian time (600-500 million years ago) have led to provocative hypotheses that true polar wander (TPW) may have occurred during that interval, at sustained rates of 30 cm/yr--far exceeding those of the last 200 million years. Careful paleomagnetic analyses of well preserved Vendian-Cambrian rocks can provide direct tests of the TPW hypotheses. This project will conduct such analyses among suitable geological formations in Australia, Quebec, and Siberia. The results, whether verifying or disproving the TPW hypotheses, will have important implications for global geodynamics, as well as for improving understanding of the tectonic environment surrounding the Cambrian "explosion" of animal life.

9814608Kirschvink 最近对旺迪纪和寒武纪（600-5 亿年前）全球古地磁数据库的综合得出了具有争议性的假设，即真正的极移 (TPW) 可能在此期间以 30 厘米/年的持续速率发生——远远超过过去2亿年的水平。 对保存完好的旺迪安-寒武纪岩石进行仔细的古地磁分析可以为 TPW 假说提供直接检验。 该项目将在澳大利亚、魁北克和西伯利亚的合适地质构造中进行此类分析。 这些结果，无论是验证还是反驳 TPW 假说，都将对全球地球动力学产生重要影响，并提高对寒武纪动物生命“爆发”周围构造环境的理解。