Collaborative Research: Geomagnetic Variability, Paleoenvironmental Change, and a Tuned Geologic Timescale from Pacific Eocene-Pleistocene Sediments from IODP Expeditions 320-321

这项研究将对印度洋大洋钻探计划第320和321次考察期间收集的从始新世到更新世的赤道太平洋沉积物岩心进行古地磁分析。利用高分辨率的U通道测量，该项目将产生高分辨率的磁性地层记录，可以作为一个非常重要的年代地层工具。该项目将实现五个目标：1）完善船上磁性地层学，2）生成连续的地磁强度和方向性古长期变化记录，3）生成环境磁性记录，4）改进新生代地质时间尺度，以及5）提高我们对太平洋视极移的理解。更广泛的影响：该项目将支持所有四个公共机构的大学的本科生和/或研究生。该项目还有效地利用了以前对海洋学发展方案考察的大量投资，并进一步加强了考察的几个国际成员与海洋学发展方案界之间的合作和信息交流。通过开发这样一个重要的年代学工具，帮助完善地质时间尺度和改善地磁强度记录，该项目对地球科学产生了重大影响。

This study will conduct paleomagnetic analyses of equatorial Pacific sediment cores spanning the Eocene through the Pleistocene collected during IODP expeditions 320 and 321. Using high resolution U-channel measurements, this project will produce a high resolution magnetostratigraphic record that could serve as a very important chronostratigraphic tool. The project will address five objectives: 1) refine the shipboard magnetostratigraphies, 2) generate continuous geomagnetic intensity and directional paleosecular variation records, 3) generate environmental magnetic records, 4) improve the Cenezoic geologic timescale, and 5) improve our understanding of the Pacific apparent polar wander.Broader impacts: The project would support undergraduate and/or graduate students at the universities of all four PIs. The project also effectively capitalizes on a large investment previously made in an IODP expedition and further enhances the collaborations and exchange of information between several international members of the expedition and the IODP community. By developing such an important chronological tool that helps refine the geologic timescale and improves the geomagnetic intensity record, the project significantly impacts the earth sciences.