Collaborative Research: An Astronomical-Calibrated Time Scale for the Mesozoic Era

合作研究：天文校准的中生代时间尺度

• 批准号: 0718905
• 负责人: Linda Hinnov
• 金额: $ 31.7万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0718905&HistoricalAwards=false
• 关键词: Collaborative; Research; Astronomical; Calibrated; Time

This collaborative project will assemble a continuous Astronomical Time Scale (ATS) for the Mesozoic Era (65 to 251 million years ago) from orbitally forced paleoclimate cycles recorded in stratigraphic data. The results should improve estimates of rates and timings of a wide range of Earth system processes by at least an order of magnitude. Project activities will be coordinated with more than a dozen international partners and will utilize the expertise of the Cretaceous, Jurassic, and Triassic subcommissions of the International Commission on Stratigraphy. The grand "team" goal is to extend the ATS, now virtually complete for the Cenozoic Era (0 to 65 million years ago), to encompass the past 250 million years. The methods that underpin the Cenozoic ATS will be applied to the Mesozoic. Emphasis will be placed on the goodness of fit of stratigraphic signals to astronomical models, duplication of records from different regions, and high-resolution calibration to geomagnetic polarity signatures and integrated bio- and chemostratigraphy. To aid in the science, a universally accessible signal processing toolbox will be created to modernize and unite leading statistical time series techniques used in cyclostratigraphic research, as well as in many other geoscience fields. Numerical ages from the reconstructed ATS will be inter-calibrated with other dating techniques in conjunction with NSF's EARTHTIME Project. All data and tools will be documented and accessible through multiple NSF public database systems, including GEON, CHRONOS, PaleoStrat, PBDB, and others. This project fulfills an ongoing global community initiative to develop a continuous, astronomical-calibrated, International Geologic Time Scale for the past quarter billion years of Earth history.

该合作项目将根据地层数据记录的轨道强迫古气候循环，构建中生代（65至2.51亿年前）的连续天文时标（ATS）。研究结果将使对各种地球系统过程的速率和时间的估计提高至少一个数量级。 项目活动将与十多个国际合作伙伴协调，并将利用国际地层委员会白垩纪、侏罗纪和三叠纪小组委员会的专业知识。 “团队”的宏伟目标是将 ATS 扩展至涵盖过去 2.5 亿年，目前新生代（0 至 6500 万年前）实际上已完成。支持新生代 ATS 的方法将应用于中生代。重点将放在地层信号与天文模型的拟合优度、不同地区记录的复制、地磁极性特征的高分辨率校准以及综合生物和化学地层学上。为了帮助科学研究，将创建一个普遍可用的信号处理工具箱，以现代化和统一用于旋回地层研究以及许多其他地球科学领域的领先统计时间序列技术。重建的 ATS 的数字年龄将与 NSF 的 EARTHTIME 项目一起与其他测年技术进行相互校准。所有数据和工具都将被记录并可通过多个 NSF 公共数据库系统访问，包括 GEON、CHRONOS、PaleoStrat、PBDB 等。该项目履行了全球社区正在进行的一项倡议，即为过去 25 亿年的地球历史制定一个连续的、经过天文校准的国际地质时标。