Recalibration of the Eocene through Late Cretaceous Polarity Time Scale

通过晚白垩世极性时间尺度重新校准始新世

• 批准号: 9811224
• 负责人: Douglas Wilson
• 金额: $ 12.11万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-11-15 至 2002-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9811224&HistoricalAwards=false
• 关键词: Recalibration; Eocene; through; Late; Cretaceous

AbstractThe PI will extend his Oligo-Miocene work on the recalibration of magnetic polarity time scale into the Late Cretaceous through Eocene interval. He will use spreading distances measured by finite rotation technique assuming relatively constant spreading rates at the ridge axes for million of years changing quickly to other constant rates. This assumption has been confirmed by the work on the last 10 million years, which has independent time scale calibration. Two to four intervals of apparent constant spreading on stable plate pairs is to be expected, with changes at time of tectonic reorganizations, such as the one at 6 Ma in the Pacific. Recalibration of the Paleogene geomagnetic polarity time scale is crucial to a better numerical time scale for the entire Cenozoic.

摘要PI将其渐新世-中新世地磁极性时间尺度的再标定工作扩展到晚白垩世至始新世区间。他将使用有限旋转技术测量的扩散距离，假设在脊轴上相对恒定的扩散速率在数百万年内迅速改变为其他恒定速率。这一假设已被过去1000万年的工作所证实，该工作具有独立的时间尺度校准。在稳定的板块对上，预计会有两到四个明显的恒定扩张间隔，随着构造重组的时间而变化，例如太平洋6 Ma的一次。古近系地磁极性时间尺度的重新标定对于获得更好的整个新生代数值时间尺度至关重要。