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false4DOIDB.GFZ 10.5880/GFZ.4.3.2024.003 Nowaczyk, Norbert R. Norbert R. Nowaczyk 0000-0002-3362-0578 GFZ German Research Centre for Geosciences, Potsdam, Germany Liu, Jiabo Jiabo Liu 0000-0002-6150-1322 GFZ German Research Centre for Geosciences, Potsdam, Germany Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei, China Hagemann, Julia Julia Hagemann Alfred-Wegener-Institut Helmholtz-Zentrum für Meeres- und Polarforschung, Bremerhaven, Germany Arz, Helge W. Helge W. Arz 0000-0002-1997-1718 Leibnitz Institute for Baltic Sea Research Warnemünde, Rostock, Germany Iwasaki, Shinya Shinya Iwasaki Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan Murayama, Masafumi Masafumi Murayama Faculty of Agriculture and Marine Science, Kochi University, Nankoku, Kochi 783-8502, Japan Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi 783-8502, Japan GFZ Data Services 2024 remanent magnetization SE Pacific Palaeomagnetism Magnetic properties Palaeointensity EPOS multi-scale laboratories paleomagnetic and magnetic data paleomagnetic data magnetic susceptibility relative paleointensity variations Core EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC DECLINATION EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC INCLINATION EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC INTENSITY EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > PALEOMAGNETISM remanent magnetisation > demagnetisation type AF Sedimentary Laboratory for Earth Magnetism in Time and Space (GFZ German Research Centre for Geosciences, Germany) GFZ German Research Centre for Geosciences, Potsdam, Germany Nowaczyk, Norbert R. GFZ German Research Centre for Geosciences, Potsdam, Germany Nowaczyk, Norbert R. GFZ German Research Centre for Geosciences, Potsdam, Germany Dataset DOI of paper when available 10.5194/cp-9-1715-2013 10.1016/j.epsl.2009.03.012 10.1073/pnas.2302983121 10.1126/science.1141038 10.1111/j.1365-246X.1980.tb02601.x 10.1029/2019JB019225 https://cchdo.ucsd.edu/data/13740/Cruise_Report_MR16-09_20170725.pdf 10.1029/2020JB021350 CC BY 4.0 Sediment cores PC02, PC03, and PC04 were recovered during the ship expedition MR16-09 Leg 2 of Japanese RV Mirai in 2017 (Murata et al., 2017) using piston corers. For paleo- and rock magnetic analyses clear plastic boxes with a volume of 7 cm3 were pressed into the split halves of the generally 1 m long sections of the sediment cores.

X-ray fluoresence (XRF) scans were performed with an Itrax XRF Corescanner (Cox Analytical systems) at Kochi Core Center, Japan (Hagemann et al. 2024). The downcore resolution was set to 5 mm, and the scans were performed with a Mo X-ray tube at 30 kV and 55 mA for a measurement time of 15 s. The Itrax X-ray beam was set to 0.2 mm × 20 mm. Measurements of low-field magnetic susceptibility (klf same as: k-bulk) and its anisotropy (AMS) were performed with an AGICO MFK1-A susceptibility meter. The principal AMS axes Kmax, Kint, and Kmin, the three axes of the anisotropy ellipsoid, were used to calculate the degree of anisotropy, as well as the shape factor of anisotropy.

The frequency dependency of magnetic susceptibility was determined with an automated MAGNON Variable Field Susceptibility Meter (VFSM) by measuring magnetic susceptibility at different frequencies with logarithmically equidistant steps at a field amplitude of 250 µT. Susceptibilities of core PC02 samples were measured at 7 frequencies F from 375 Hz to 4775 Hz. Samples from cores PC03 and PC04 were measured at 5 frequencies from 475 to 4775 Hz. The frequency dependency Dk/Dlog(F) then was determined by linear regression of susceptibility k versus the decadal logarithm of frequency F. Values are given as decay rate in percent over one frequency decade (% / decade (F)) relative to the measurement at the lowest frequency. Thus, values obtained are negative.

Measurements of the natural remanent magnetization (NRM) and of the anhysteretic remanent magnetization (ARM) were performed with a 2G 755 SRM long-core cryogenic magnetometer. ARMs were produced with a 2G660 single-axis alternating field (AF) demagnetizer using 100 mT alternating field and 50 µT static field. NRMs and ARMs both were stepwise demagnetized with the in-line 3-axes AF demagnetizer of the cryogenic magnetometer. AF steps for NRM: 0, 5, 10, 15, 20, 30, 40, 50, 65, 80, 100 mT. AF steps for ARM: 0, 10, 20, 30, 40, 50, 65, 80 mT. Iso-thermal remanent magnetizations (IRM) were imparted with a 2G 660 pulse magnetizer using 1500 mT for producing a saturation magnetization (SIRM) and -200 mT for remagnetization of the low-coercive fraction. Measurements were performed with a Molyneux spinner magnetometer.

Data records were turned into time series by applying the age model for PC03 (Hagemann et al., 2024), correlating PC02 to PC03, and correlating PC04 to PC03 (back to 140 ka) and further using the PISO1500 paleointensity stack (Channell et al., 2009), paleomagnetic data from the Black Sea (Liu et al., 2020, Nowaczyk et al., 2021), and paleoclimatic data from Antarctica (Jouzel et al., 2007; Bazin et al., 2013) for reference for older core sections.
Core MR16-09-2-PC02 Core MR16-09-2-PC03 Core MR16-09-2-PC04