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

这项研究将对在IODP探险320和321期间收集的横跨始新世至更新世的赤道太平洋沉积岩芯进行古地磁分析。利用高分辨率U通道测量，该项目将产生高分辨率磁性地层记录，可作为一种非常重要的年代地层工具。该项目将致力于五个目标：1)完善舰船磁地层学，2)产生连续的地磁强度和定向的古分子变化记录，3)产生环境磁记录，4)改进始生界地质时间尺度，5)提高我们对太平洋视极移的理解。该项目还有效地利用了以前在IODP考察队中进行的一大笔投资，并进一步加强了考察队的几名国际成员与IODP社区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，有助于完善地质时间尺度和改进地磁强度记录，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.