Proc. IODP, 320/321, Data report: temporal variation in natural remanent magnetization observed for Pacific plate basement rocks: compilation from legacy data and new paleomagnetism and rock magnetism data from seafloor basalts cored during Expedition 320/321

IODP Proceedings Volume contents Search

Expedition reports Research results Supplementary material Drilling maps Expedition bibliography
Chapter contents Abstract Introduction Methods and materials NRM data compilation from DSDP, ODP, and IODP sites on the Pacific plate Rock magnetic and paleomagnetic measurements on Expedition 320/321 basement rocks Results NRM data compilation from DSDP, ODP, and IODP sites on the Pacific plate Rock magnetic and paleomagnetic measurements on Expedition 320/321 basement rocks Temporal variation in igneous basement rock NRM observed for the Pacific plate Acknowledgments References Figures F1. Igneous basement rock sites. F2. NRM data sites. F3. FORC diagrams. F4. Thermomagnetic curves. F5. Backscattered electron microscope images. F6. Demagnetization results. F7. Age variation. Tables T1. NRM data. T2. NRM and ARM intensity. T3. Hysteresis parameters. PDF file			Previous \| Next doi:10.2204/iodp.proc.320321.213.2013 Data report: temporal variation in natural remanent magnetization observed for Pacific plate basement rocks: compilation from legacy data and new paleomagnetism and rock magnetism data from seafloor basalts cored during Expedition 320/321¹ Yuhji Yamamoto² Abstract Previous rock magnetism data compilations from oceanic basement rocks show that intensity of natural remanent magnetization (NRM) decays with age from 0 to 30 Ma and then increases prior to 40 Ma. This temporal trend in NRM is regarded as tentative. One of the problems seems to be that these compilations were made from NRM data without regard to the oceanic plates where the samples were collected. As a case study, we have compiled basement rock NRM data from Deep Sea Drilling Project and Ocean Drilling Program sites on the Pacific plate only. The present compilation results in 103 NRM data points for the 0–50 and 110–170 Ma intervals. We also conducted rock magnetism and paleomagnetism studies on basement rocks recovered from five sites drilled during Integrated Ocean Drilling Program Expedition 320/321 in order to provide new data. These samples yield 13 new NRM data points for the 24–50 Ma interval. ¹ Yamamoto, Y., 2013. Data report: temporal variation in natural remanent magnetization observed for Pacific plate basement rocks: compilation from legacy data and new paleomagnetism and rock magnetism data from seafloor basalts cored during Expedition 320/321. In Pälike, H., Lyle, M., Nishi, H., Raffi, I., Gamage, K., Klaus, A., and the Expedition 320/321 Scientists, Proc. IODP, 320/321: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.320321.213.2013 ² Center for Advanced Marine Core Research, Kochi University, Kochi 783-8502, Japan. y.yamamoto@kochi-u.ac.jp Initial receipt: 18 August 2012 Acceptance: 31 October 2012 Publication: 8 February 2013 MS 320321-213 Top of page \| Previous \| Next